WO2015019411A1 - 半導体集積回路装置 - Google Patents
半導体集積回路装置 Download PDFInfo
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- WO2015019411A1 WO2015019411A1 PCT/JP2013/071213 JP2013071213W WO2015019411A1 WO 2015019411 A1 WO2015019411 A1 WO 2015019411A1 JP 2013071213 W JP2013071213 W JP 2013071213W WO 2015019411 A1 WO2015019411 A1 WO 2015019411A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B10/00—Static random access memory [SRAM] devices
- H10B10/12—Static random access memory [SRAM] devices comprising a MOSFET load element
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/41—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger
- G11C11/412—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger using field-effect transistors only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/41—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger
- G11C11/413—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing, timing or power reduction
- G11C11/417—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing, timing or power reduction for memory cells of the field-effect type
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
- G11C8/16—Multiple access memory array, e.g. addressing one storage element via at least two independent addressing line groups
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B10/00—Static random access memory [SRAM] devices
- H10B10/18—Peripheral circuit regions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/62—Fin field-effect transistors [FinFET]
- H10D30/6211—Fin field-effect transistors [FinFET] having fin-shaped semiconductor bodies integral with the bulk semiconductor substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/17—Semiconductor regions connected to electrodes not carrying current to be rectified, amplified or switched, e.g. channel regions
- H10D62/393—Body regions of DMOS transistors or IGBTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D64/00—Electrodes of devices having potential barriers
- H10D64/20—Electrodes characterised by their shapes, relative sizes or dispositions
- H10D64/23—Electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. sources, drains, anodes or cathodes
- H10D64/251—Source or drain electrodes for field-effect devices
- H10D64/257—Source or drain electrodes for field-effect devices for lateral devices wherein the source or drain electrodes are characterised by top-view geometrical layouts, e.g. interdigitated, semi-circular, annular or L-shaped electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D89/00—Aspects of integrated devices not covered by groups H10D84/00 - H10D88/00
- H10D89/10—Integrated device layouts
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- H10W20/43—
Definitions
- the present application relates to a semiconductor integrated circuit device (or semiconductor device), and can be applied to, for example, an SRAM (Static Random Access Memory) circuit and a device having the same.
- SRAM Static Random Access Memory
- Patent Document 1 Japanese Unexamined Patent Publication No. 2011-171753
- Patent Document 2 US Pat. No. 6,535,453
- Patent Document 3 Japanese Unexamined Patent Publication No. 2003-297793
- Patent Document 4 Japanese Patent No. 8238142
- Patent Document 5 Japanese Patent Laid-Open No. 2002-43441
- Patent Document 5 relates to a multi-port SRAM.
- the center of the cell is an N-type well region.
- an SRAM layout in which P-type well regions are arranged on both sides thereof.
- Patent Document 6 similarly relates to a multi-port SRAM. There are disclosed various triple-port SRAM circuits and cell layouts corresponding to them.
- Patent Document 7 Japanese Unexamined Patent Publication No. 2011-35398 (Patent Document 7) or US Pat. No. 8,0094,633 (Patent Document 8) corresponding thereto relates to a multi-port SRAM.
- Patent Document 8 Japanese Unexamined Patent Publication No. 2011-35398
- Patent Document 8 US Pat. No. 8,0094,633
- Patent Document 8 Japanese Unexamined Patent Publication No. 2011-35398
- Patent Document 8 US Pat. No. 8,0094,633
- a multi-port SRAM is mixedly mounted together with a logic circuit such as a digital signal processing circuit.
- a logic circuit such as a digital signal processing circuit.
- 1 port is a differential write & read port
- 2 ports are single-ended read only ports.
- the write and read ports are limited to one and that high-speed read characteristics as high as differential read cannot be expected with single-ended read. Became clear.
- the outline of an embodiment of the present application is that, in a memory cell structure of an embedded SRAM, it has three differential write & read ports (transmission gate base), and an N well region, for example, in the center of the cell. And a P-well region is arranged on both sides thereof.
- a plurality of high-speed write & read ports can be secured without significantly increasing the cell occupation area.
- FIG. 1 is an overall chip top view for explaining an outline of a layout of a memory-embedded logic chip that is an example of a semiconductor chip in a semiconductor integrated circuit device according to an embodiment of the present application
- FIG. 2 is a circuit block diagram for explaining an example of a relationship between an embedded SRAM area EM and a digital signal processing circuit area DSP in FIG. 1.
- FIG. 2 is a schematic circuit diagram of a memory cell region MC in FIG. 1 for explaining a basic cell layout (all complementary bit line configuration 3 ports) of an embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- FIG. 4 is an enlarged plan layout view (displaying up to a third layer embedded wiring) of the memory cell region MC of FIG. 1 corresponding to FIG. 3;
- FIG. 5 is an enlarged plan layout view (displaying up to 1-2 interlayer vias 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 4;
- FIG. 5 is an enlarged plan layout view (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. 4; Expansion of the memory cell region MC in FIG. 1 corresponding to FIG. 5 for explaining the first modification (active region equal width type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- FIG. 6 is a plan layout view (displaying up to 1-2 interlayer via 21).
- FIG. 8 is a device cross-sectional view corresponding to the X-X ′ cross section of FIG. 7.
- FIG. 1 corresponding to FIG. 7 for explaining a modification 2 (A port type N channel type MISFET active region wide type 3 port) concerning the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application.
- FIG. 4 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of a memory cell region MC.
- FIG. 1 corresponding to FIG. 5 for explaining a third modification (A port system high Vth-B & C port system low Vth type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application.
- FIG. 6 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG.
- the memory cell region MC (vertical) in FIG.
- FIG. 12 is an enlarged plan layout view (displaying up to a third layer embedded wiring) of the memory cell region MC1 of FIG. 11 and its periphery.
- FIG. 13 is an enlarged plan layout view (displaying up to 1-2 interlayer vias 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 12;
- FIG. 13 is an enlarged plan layout view (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG.
- FIG. 12 is a schematic circuit diagram illustrating an example of a read circuit (also including a write circuit) corresponding to FIG. 11.
- FIG. 13 is an enlarged plan layout view (up to the second layer embedded wiring is shown) showing the range of FIG. 12 expanded to three adjacent cells in the upward direction.
- FIG. 17 is an enlarged plan layout view corresponding to FIG. 16 (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3).
- Memory cell region MC (FIG. 1) corresponding to FIG. 11 for explaining the fifth modification (partial single-ended bit line configuration 4 ports) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- 3 is a schematic circuit diagram in a vertical direction, that is, three cells are displayed in the bit line direction.
- FIG. 19 is an enlarged plan layout view (up to the third layer embedded wiring) of the memory cell region MC1 and the periphery thereof in FIG. 18;
- FIG. 20 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 19;
- FIG. 20 is an enlarged plan layout view (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. 19;
- FIG. 19 is a schematic circuit diagram (C port system single-ended bit line) illustrating an example of a read circuit corresponding to FIG. 18;
- FIG. 19 is a schematic circuit diagram (D port system single-ended bit line) illustrating an example of a read circuit corresponding to FIG. 18;
- FIG. 20 is an enlarged plan layout diagram showing the range of FIG. 19 expanded to three adjacent cells in the upward direction (however, up to the second layer embedded wiring is displayed);
- FIG. 25 is an enlarged plan layout diagram corresponding to FIG. 24 (displaying up to 1-2 interlayer via 21).
- FIG. 25 is an enlarged plan view layout diagram (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) corresponding to FIG. 24;
- FIG. 1 is an enlarged plan layout view of the memory cell region MC of FIG.
- FIG. 28 is an enlarged plan layout view (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. 27; 1 is an enlarged planar layout of the memory cell region MC of FIG. 1 for explaining a modified example 7 (B & C port-based access MISFET mutual upside down three ports) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application. It is a figure (displaying to 3rd layer embedded wiring).
- FIG. 28 is an enlarged plan layout view (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. 27; 1 is an enlarged planar layout of the memory cell region MC of FIG. 1 for explaining a modified example 7 (B & C port-based access MISFET mutual upside down three ports) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application. It is
- FIG. 30 is an enlarged plan layout diagram (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 29;
- FIG. 30 is an enlarged plan view layout (mainly showing a second layer embedded wiring M2 and a third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. 29;
- 1 is an enlarged plan layout view (1-2) of the memory cell region MC of FIG. 1 for explaining a modification 8 (FIN basic type 3 port) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application. (Up to interlayer via 21 is displayed).
- FIG. 33 is a device perspective view showing an example of a three-dimensional shape of the FIN-type MIFET of FIG. 32.
- FIG. 30 is an enlarged plan layout diagram (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 29;
- FIG. 30 is an enlarged plan view layout (mainly showing a second
- FIG. 3 is a schematic circuit diagram of a memory cell region MC.
- FIG. FIG. 35 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. 34; Memory cell region MC of FIG. 1 corresponding to FIG. 34 for explaining Modification Example 9 (A port system access MISFET parallel FIN type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- It is a schematic circuit diagram.
- FIG. 36 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the corresponding memory cell region MC of FIG. 3 is a schematic circuit configuration diagram of an embedded SRAM region EM for explaining an outline of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- FIG. 3 is a schematic circuit configuration diagram of an embedded SRAM region EM for explaining an outline of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- each memory cell region has a rectangular shape having a long side and a short side in plan view, and includes the following: (D1) a first well region having a first conductivity type provided at a central portion with respect to the long side; (D2) a second well region and a third well region having a second conductivity type provided on both sides of the first well region with respect to the long side; (D3) a first bit line and a second bit line extending in a direction orthogonal to the long side and forming a mutually complementary pair; (D4) a third bit line and a fourth bit line extending in a direction orthogonal to the long side and forming a mutually complementary pair; (D5)
- each memory cell region further includes: (D6) data storage unit; (D7) a first storage node provided in the data storage unit; (D8) a second storage node provided in the data storage unit and complementary to the first storage node; (D9) a first driver MISFET provided in the second well region and having one of its source and drain terminals connected to the first storage node; (D10) a second driver MISFET which is the data storage unit and is provided in the third well region, and one of the source and drain terminals thereof is connected to the second storage node; (D11) a first access MISFET provided in the second well region, with one of its source and drain terminals connected to the first storage node and the other connected to the first bit line; (D12) a second access MISFET provided in the third well region, with one of its source and drain terminals connected to the second storage node and the other connected to the second bit line; (D13) a third access MISFET provided in the second well region, with one of its source
- each memory cell region further includes: (D17) The first driver MISFET and the first access MISFET are formed, and the first driver MISFET and the first access MISFET have a rectangular shape extending in the second well region in a direction perpendicular to the long side. Active area of; (D18) The third access MISFET and the fifth access MISFET are formed, and the second access MISFET has a rectangular shape extending in the second well region in a direction perpendicular to the long side.
- each memory cell region further includes: (D21) a first local interconnect that interconnects the impurity regions of the first active region and the second active region; (D22) A second local interconnect that interconnects the impurity regions of the third active region and the fourth active region.
- each memory cell region further includes: (D23) a first pull-up MISFET which is the data storage unit and is provided in the first well region, and one of its source and drain terminals is connected to the first storage node; (D24) a second pull-up MISFET provided in the first well region and having one of its source and drain terminals connected to the second storage node; (D25) A power supply wiring that is connected to the other terminals of the first pull-up MISFET and the second pull-up MISFET, extends in a direction orthogonal to the long side, and includes a first layer embedded wiring .
- each memory cell region further includes: (D23) a first pull-up MISFET which is the data storage unit and is provided in the first well region, and one of its source and drain terminals is connected to the first storage node; (D24) a second pull-up MISFET provided in the first well region and having one of its source and drain terminals connected to the second storage node;
- all MISFETs constituting each memory cell region are constituted by Fin-type FETs.
- each memory cell region or any one of the memory cell regions adjacent above and below has the following: (D26) a first word line extending in a direction parallel to the long side in the memory cell region and controlling the first access MISFET and the second access MISFET in the memory cell region; (D27) In a memory cell region adjacent in the vertical direction of the memory cell region, the memory cell region extends in a direction parallel to the long side, and the adjacent memory cell region and the third access MISFET of the memory cell region A second word line for controlling the fourth access MISFET; (D28) The fifth access MISFET of the memory cell region extending in the direction parallel to the long side in the memory cell region and adjacent to the memory cell region and the vertical direction of the memory cell region, and A third word line for controlling the sixth access MISFET.
- the widths of the first active region, the second active region, the third active region, and the fourth active region are: equal.
- each memory cell region has a rectangular shape having a long side and a short side in plan view, and includes the following: (D1) a first well region provided in the center with respect to the long side; (D2) a second well region and a third well region provided on both sides of the first well region with respect to the long side; (D3) a first bit line and a second bit line extending in a direction orthogonal to the long side and forming a mutually complementary pair; (D4) a third bit line and a fourth bit line extending in a direction orthogonal to the long side and forming a mutually complementary pair; (D5) A fifth bit line and a sixth bit line that extend in a direction
- each memory cell region further includes: (D6) data storage unit; (D7) a first storage node provided in the data storage unit; (D8) a second storage node provided in the data storage unit and complementary to the first storage node; (D9) a first driver MISFET provided in the second well region and having one of its source and drain terminals connected to the first storage node; (D10) a second driver MISFET which is the data storage unit and is provided in the third well region, and one of the source and drain terminals thereof is connected to the second storage node; (D11) a first access MISFET provided in the second well region, with one of its source and drain terminals connected to the first storage node and the other connected to the first bit line; (D12) a second access MISFET provided in the third well region, with one of its source and drain terminals connected to the second storage node and the other connected to the second bit line; (D13) a third access MISFET provided in the second well region, with one of its
- each memory cell region further includes: (D17) The first driver MISFET and the first access MISFET are formed, and the first driver MISFET and the first access MISFET have a rectangular shape extending in the second well region in a direction perpendicular to the long side. Active area of; (D18) The third access MISFET and the fifth access MISFET are formed, and the second access MISFET has a rectangular shape extending in the second well region in a direction perpendicular to the long side.
- each memory cell region further includes: (D21) a first local interconnect that interconnects the impurity regions of the first active region and the second active region; (D22) A second local interconnect that interconnects the impurity regions of the third active region and the fourth active region.
- the width of the first active region is wider than the width of the second active region, and the width of the third active region is the fourth active region. It is wider than the width of the active area.
- each memory cell region or one of the memory cell regions adjacent to the upper and lower sides thereof further has the following: (D23) a first word line extending in a direction parallel to the long side in the memory cell region and controlling the first access MISFET and the second access MISFET in the memory cell region; (D24) The memory cell region extends in a direction parallel to the long side at or near the boundary region of the memory cell region vertically adjacent to the memory cell region, and the third access MISFETs of these memory cell regions and A second word line for controlling the fourth access MISFET; (D25) A third word that extends in the direction parallel to the long side in the memory cell region and controls the fifth access MISFET in the memory cell region adjacent to the memory cell region in the vertical direction line; (D26) A fourth word line extending in a direction parallel to the long side in the memory cell region vertically adjacent to the memory cell region and controlling the sixth access MISFET of these memory cell regions .
- semiconductor device or “semiconductor integrated circuit device” mainly refers to various types of transistors (active elements) alone, and resistors, capacitors, etc. as semiconductor chips (eg, single crystal). A silicon substrate) or a semiconductor chip packaged.
- MISFET Metal Insulator Semiconductor Effect Transistor
- MOSFET Metal Oxide Field Element Effect Transistor
- CMOS Complementary Metal Oxide Semiconductor
- the wafer process of today's semiconductor integrated circuit device that is, LSI (Large Scale Integration) is usually considered in two parts. That is, the first consists of carrying in a silicon wafer as a raw material to a premetal process (formation of an interlayer insulation film between the lower end of the M1 wiring layer and the gate electrode structure, contact hole formation, tungsten plug, embedding, etc. This is a FEOL (Front End of Line) process. The second is BEOL (Back End of Line) starting from the formation of the M1 wiring layer until the formation of the pad opening in the final passivation film on the aluminum-based pad electrode (including the process in the wafer level package process). It is a process.
- FEOL Front End of Line
- the same layer name is assigned to the wiring and via belonging to the same interlayer insulating film. That is, the via between the first layer embedded wiring and the second layer embedded wiring is the second layer via.
- the material, composition, etc. may be referred to as “X consisting of A”, etc., except when clearly stated otherwise and clearly from the context, except for A It does not exclude what makes an element one of the main components.
- the component it means “X containing A as a main component”.
- silicon member is not limited to pure silicon, but also includes SiGe alloys, other multi-component alloys containing silicon as a main component, and members containing other additives. Needless to say.
- silicon oxide film “silicon oxide insulating film” and the like are not only relatively pure undoped silicon oxide but also other silicon oxides as main components. Including membrane.
- a silicon oxide insulating film doped with impurities such as TEOS-based silicon oxide (TEOS-based silicon oxide), PSG (Phosphorus Silicate Glass), BPSG (Borophosphosilicate Glass) is also a silicon oxide film.
- a coating system film such as SOG (Spin On Glass) or nano-clustering silica (NSC) is also a silicon oxide film or a silicon oxide insulating film.
- a low-k insulating film such as FSG (Fluorosilicate Glass), SiOC (Silicon Oxalbide), carbon-doped silicon oxide (OSD), or OSG (Organosilicate Glass) is also similarly used. It is a membrane. Further, a silica-based Low-k insulating film (porous insulating film, including “porous” or “porous” when including a porous porous material) in which pores are introduced in the same members as those described above is also a silicon oxide film or silicon oxide. It is a system insulating film.
- silicon nitride insulating films that are commonly used in the semiconductor field include silicon nitride insulating films.
- Materials belonging to this system include SiN, SiCN, SiNH, SiCNH, and the like.
- SiN silicon nitride
- SiNH silicon nitride
- SiCNH silicon nitride insulating films.
- SiC has properties similar to SiN
- SiON should be classified as a silicon oxide insulating film in many cases, but in the case of an etch stop film, it is close to SiC, SiN, or the like.
- the silicon nitride film is frequently used as an etch stop film in SAC (Self-Aligned Contact) technology, that is, CESL (Contact Etch-Stop Layer), and also used as a stress imparting film in SMT (Stress Memoryization Technique). .
- SAC Self-Aligned Contact
- CESL Contact Etch-Stop Layer
- SMT Stress Memoryization Technique
- “Wafer” usually refers to a single crystal silicon wafer on which a semiconductor integrated circuit device (same as a semiconductor device and an electronic device) is formed, but an insulating substrate such as an epitaxial wafer, an SOI substrate, an LCD glass substrate and the like. Needless to say, a composite wafer such as a semiconductor layer is also included.
- “whole”, “whole”, “whole area” and the like include cases of “substantially whole”, “substantially general”, “whole area”, and the like. Therefore, for example, 80% or more of a certain area can be referred to as “whole”, “whole”, and “whole area”. The same applies to “all circumferences”, “full lengths”, and the like.
- the term “rectangular” includes “substantially rectangular”. Therefore, for example, if the area of the portion different from the rectangle is less than about 20% of the whole, it can be said to be a rectangle. In this case, the same applies to “annular” and the like. In this case, when the annular body is divided, a portion obtained by interpolating or extrapolating the divided element portion is a part of the annular body.
- periodic includes almost periodic, and for each element, for example, if the deviation of the period is less than about 20%, each element can be said to be “periodic”. . Furthermore, if what is out of this range is, for example, less than about 20% of all the elements to be periodic, it can be said to be “periodic” as a whole.
- the “data storage section” (with respect to the memory cell) refers to a portion of the SRAM memory cell that retains data and excludes an access MISFET, a word line, a bit line, and the like.
- the “local interconnect” is a layout in which tungsten plugs for normal contacts are laid out relatively long, and interconnect wiring (so-called first wiring) between two or more impurity regions on a semiconductor substrate. This means what is used as the zero-layer wiring).
- width refers to the width in the short side direction, that is, the width orthogonal to the long side (longitudinal direction). Usually equal to the length of the short side.
- “height” (about the memory cell) means the length of the short side in the case of a substantially rectangular memory cell. Specifically, it is the width of the memory cell measured along the extending direction of the bit line.
- MISFET Unlike the “planar gate type MISFET”, there are MISFETs having a three-dimensional channel structure called “FIN type MISFET”, etc., but there are various similar structures and classifications are also divided into sections. Accordingly, in the present application, in a narrow sense, a fin (FIN) type, a pi gate (Pi-Gate) type, an omega gate ( ⁇ -Gate) type, a tri-gate (Tri-Gate) type, an all-round gate (Gate-all-) The term “FIN type MISFET” is used in a broad sense, including the “around” type.
- FIN type parallel MISFET refers to one in which a plurality of FIN type MISFETs are connected in parallel and used like a single MISFET. In particular, when distinguishing non-parallel ones, it is called “FIN type non-parallel MISFET”.
- hatching or the like may be omitted even in a cross section when it becomes complicated or when it is clearly distinguished from a gap.
- the contour line of the background may be omitted even if the hole is planarly closed.
- it may be hatched to clearly indicate that it is not a void.
- FIGS. 1 and 2 Description of a memory-embedded logic chip that is an example of a semiconductor chip in a semiconductor integrated circuit device according to an embodiment of the present application (mainly FIGS. 1 and 2)
- the chip layout or the like shown in this section is an example of a semiconductor integrated circuit device to which the cell layout described in section (2-2) is applied, and it goes without saying that various forms can be used in other forms.
- specific description will be given mainly using an embedded SRAM as an example, but it goes without saying that the following various examples can also be applied to a general-purpose SRAM, that is, a non-embedded SRAM such as a dedicated SRAM.
- a transmission port type access (Transmission Gate Based Access) MISFET configuration multi-port memory cell that is, a non-isolated multi-port memory cell will be specifically described as an example.
- the multi-port memory cell having the transmission gate type access MISFET configuration has an advantage that any port (with respect to the differential port) can be used for writing.
- a device having a separate read port has a high degree of integration and also has the possibility of access for writing and reading to the same cell at the same time.
- FIG. 1 is an entire top view of a chip for explaining an outline of a layout of a memory-embedded logic chip which is an example of a semiconductor chip in a semiconductor integrated circuit device according to an embodiment of the present application.
- FIG. 2 is a circuit block diagram for explaining an example of the relationship between the embedded SRAM area EM and the digital signal processing circuit area DSP of FIG. Based on these, a memory-embedded logic chip, which is an example of a semiconductor chip in the semiconductor integrated circuit device of one embodiment of the present application, will be described.
- an analog circuit area AR for processing an analog signal related to an image or the like is provided on the first main surface 1a or surface (device surface) of the SRAM-embedded logic chip 2 (semiconductor substrate).
- a logic circuit region LR for performing digital logic processing is provided on the first main surface 1a of the chip 2.
- a digital signal processing circuit region DSP for processing a digital signal is provided on the first main surface 1a of the chip 2.
- an embedded SRAM area EM that accommodates an SRAM (Static Random Access Memory) circuit is provided on the first main surface 1 a of the chip 2.
- the SRAM area EM accommodates a 3-port SRAM circuit (referred to as a “3-port SRAM circuit”).
- the embedded SRAM area EM can be divided into a memory array area MA and a memory peripheral circuit area PR.
- a large number of memory cell areas MC MC1 are arranged in a matrix.
- a large number of word lines WL Wordline
- BL bit lines
- the memory peripheral circuit region PR is provided with a column control circuit region CC for controlling reading and writing of data via a row control circuit RC for controlling the word line WL and the like and a bit line BL.
- FIG. 2 shows an example of the relationship between the digital signal processing circuit area DSP and the 3-port SRAM circuit EM in FIG.
- the data A stored in the 3-port SRAM circuit EM is read out via the A port PA, and the data B read out via the B port PB is converted into a digital signal.
- digital arithmetic processing is performed to obtain data C, which is stored in the 3-port SRAM circuit EM via the C port PC.
- image processing and the like such a series of processes is repeated at a high speed.
- CMIS Complementary Metal Insulator Semiconductor
- SRAM Serial Advanced RAM
- a port is added by adding a transfer MISFET as an access transistor (transfer gate base multiport).
- the embedded SRAM will be described.
- the memory cell may be another type of SRAM cell.
- the number of ports is not limited to three, and may be four or more or two.
- the MISFETs used in sections other than sections (2-10) to (2-12) are basically all planar gate type, but all or part of the MISFETs use Fin type MISFETs. Needless to say.
- the embedded memory region will be specifically described by taking a three-layer metal wiring structure as an example, but the total number of wiring layers may be four or more. Other than that.
- the embedded wiring is a copper-based embedded wiring by a damascene method or the like, but is not limited to a copper-based embedded wiring, and may be a silver-based or other embedded wiring.
- the wiring system is not limited to the embedded wiring but may be a non-embedded wiring such as an aluminum-based wiring.
- FIG. 3 is a schematic circuit diagram of the memory cell region MC of FIG. 1 for explaining the basic cell layout (all complementary bit line configuration 3 ports) of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application. is there.
- FIG. 4 is an enlarged plan layout view (displaying up to the third layer embedded wiring) of the memory cell region MC of FIG. 1 corresponding to FIG.
- FIG. 5 is an enlarged plan layout view (up to the 1-2 interlayer via 21 is shown) of the memory cell region MC of FIG. 1 corresponding to FIG. 6 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. Based on these, the basic cell layout (all complementary bit line configuration 3 ports) of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application will be described.
- the circuit configuration of the memory cell MC will be described with reference to FIG. 3 (this memory cell is generally called “complete CMOS cell” or the like).
- the data storage portion SP of the memory cell region MC (MC1) is provided with P channel type pull-up (Pull Up) MISFETs (P11, P12), and one of these source / drain terminals.
- Pdd power supply wiring
- Node positive storage node
- SNB inverted storage node
- One of the source and drain terminals of the first driver MISFET that is, the N-channel type driver (Driver) MISFET (DN11)
- the N-channel type driver MISFET DN11
- the second driver MISFET that is, the N-channel type driver MISFET (DN12)
- the inverting storage node SNB is connected to the ground wiring Vss.
- the gate electrodes of the P-channel pull-up MISFET (P11) and the N-channel driver MISFET (DN11) are connected to the inversion storage node SNB, and the P-channel pull-up MISFET (P12) and the N-channel driver The gate electrode of the MISFET (DN12) is connected to the positive storage node SN.
- An A port word line WLA1, a B port word line WLB1, and a C port word line WLC1 are provided in the row direction (X-axis direction or horizontal direction) in the memory cell region MC.
- the A port word line WLA1 is connected to the gate electrodes of the first and second access MISFETs, that is, N-channel access MISFETs (AN11, AN12).
- the gate electrode of the third and fourth access MISFETs that is, N-channel access MISFETs (AN13 and AN14) is connected to the B port word line WLB1.
- the gate electrodes of the fifth and sixth access MISFETs that is, N-channel access MISFETs (AN15, AN16) are connected to the C port word line WLC1.
- the A port (Port) positive (True) bit line BLA first bit line
- a pair of A-port inversion (Complementary) bit lines BLAB second bit lines
- One of the source and drain terminals of the N-channel type access MISFET (AN11) is connected to the A port positive bit line BLA, and the other is connected to the positive storage node SN (first storage node).
- one of the source and drain terminals of the N-channel access MISFET (AN12) is connected to the A port inverted bit line BLAB, and the other is connected to the inverted storage node SNB (second storage node).
- SNB second storage node
- a B-port positive bit line BLB third bit line
- a B-port inverted bit line BLBB fourth bit line
- AN13 One of the source and drain terminals of the N-channel access MISFET (AN13) is connected to the B port positive bit line BLB, and the other is connected to the positive storage node SN.
- AN14 one of the source and drain terminals of the N-channel access MISFET (AN14) is connected to the B port inverted bit line BLBB, and the other is connected to the inverted storage node SNB.
- Port (complementary write & read port) is configured.
- C port positive bit line BLC (fifth bit line) and a C port inversion bit line BLCB (sixth bit line) forming a complementary pair therewith.
- One of the source and drain terminals of the N-channel access MISFET (AN15) is connected to the C port positive bit line BLC, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N channel type access MISFET (AN16) is connected to the C port inverted bit line BLCB, and the other is connected to the inverted storage node SNB.
- Port (complementary write & read port) is configured.
- the memory array area MA (FIG. 1) has a horizontally long rectangular memory cell area MC1 (MC) periodically spread in a matrix. It has a structure (some operations such as flipping may be included for convenience of layout).
- the basic concept of layout is summarized as follows. That is, (1) In the central portion of the memory cell region MC1, N-type well region 4n (first conductivity type first) for forming first and second pull-up MISFETs, that is, P-channel type pull-up MISFETs (P11, P12). 1 well region).
- an N-type driver MISFET (DN11) and an N-type access MISFET (AN11, AN13, AN15) for forming a P-type well region 4p A second well region of the second conductivity type
- a third well region) of the mold is placed.
- the left and right P-type well regions 4p may be connected to each other.
- the active regions 18p1 and 18p2 where the P-type source / drain regions and the like are formed have a vertically long rectangular shape, and are geometrically separated from each other by the STI region 3 (element isolation region). Then, it is arranged in the N-type well region 4n.
- the active region 18n1 for forming the N-channel driver MISFET (DN11) and the N-channel access MISFET (AN11, AN13, AN15) In the example, it has a complex polygonal shape including an integral recess, and is provided in the left P-type well region 4p.
- the active region 18n2 for forming the N-channel driver MISFET (DN12) and the N-channel access MISFET (AN12, AN14, AN16) has a complex polygonal shape including an integral recess in this example. Are provided in the right P-type well region 4p.
- Each gate electrode 16 extends in the lateral direction so as to cross the corresponding active region 18n1, 18n2, 18p1, 18p2.
- the relatively short interconnection in the memory cell region MC1 is mainly formed by the first layer embedded wiring M1.
- the first layer embedded wiring M1 is formed by, for example, a single damascene method.
- the first-layer buried wiring M1 is also used as an intermediate metal layer between the upper and lower conductive layers.
- each gate electrode 16, the first layer embedded wiring M 1, etc. and the corresponding active region 18 n 1, 18 n 2, 18 p 1, 18 p 2 is contact portion 6 (specifically, For example, it is taken through a tungsten plug).
- relatively long wirings in the vertical direction such as the layer through wirings TW21 and TW22 are formed by the second layer embedded wiring M2.
- the second layer embedded wiring M2 is formed by, for example, a dual damascene method.
- the second-layer buried wiring M2 is also used as an intermediate metal layer between the upper and lower conductive layers.
- the ground wiring Vss by the second layer embedded wiring M2 is arranged between adjacent bit lines to provide a shielding effect.
- the second layer through wiring such as signal wiring which is not directly related to the SRAM region by the second layer embedded wiring M2 is connected to the power wiring. And running in parallel. This has the merit that a relatively lower layer wiring can be used as a longitudinal signal line.
- the first layer embedded wiring M1 and the second layer embedded wiring M2 are connected to each other by the 1-2 interlayer via 21.
- Each word line WLA1, WLB1, WLC1 is formed by a third layer embedded wiring M3 in this example.
- the third layer embedded wiring M3 is formed by, for example, a dual damascene method.
- Each second layer embedded wiring M2 and third layer embedded wiring M3 are connected to each other by 2-3 interlayer vias 22.
- the N well region is disposed in the center of the horizontally long rectangular memory cell region, the P well regions are disposed on both sides, and each port has a differential bit line configuration. Therefore, high-speed writing and reading characteristics can be secured for each port (transmission gate base) while minimizing an increase in the chip occupation area.
- This example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-5) to (2-12).
- FIG. 7 is a memory cell region of FIG. 1 corresponding to FIG. 5 for explaining a modification 1 (active region equal width type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- FIG. 4 is an enlarged plan layout view of MC (displaying up to 1-2 interlayer via 21).
- FIG. 8 is a device cross-sectional view corresponding to the X-X ′ cross section of FIG. 7. Based on these drawings, a description will be given of Modification Example 1 (active area equal width type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- This layout is basically the same as that described with reference to FIGS. 3 to 6.
- the shape of the active region in the P-type well region 4p is different.
- a LIC Local Interconnect
- the active regions 18n1, 18n2, 18n3, and 18n4 where the N-type source / drain regions and the like are formed each have a vertically long rectangular shape, and geometrically the STI region 3 (element isolation region) Are vertically separated in the P-type well region 4p.
- the width of each active region 18n1, 18n2, 18n3, 18n4 is: Are equal. This facilitates lithography.
- the LICs As a result of the separation of the active regions 18n1, 18n3 and the active regions 18n2, 18n4 from each other, the LICs, ie, the local interconnects 8a, 8b (first local interconnect and second Local interconnect).
- FIG. 8 shows a cross section taken along line X-X ′ of FIG.
- the chip 2 (FIG. 1) is formed on, for example, a P-type single crystal silicon semiconductor substrate 1s.
- a P-type well region 4p is provided on the top thereof
- An STI (Shallow Trench Isolation) region 3 is provided on the surface.
- the surface of the semiconductor substrate 1s without the STI region 3 is an active region, and a high concentration N-type source / drain region 5n is provided in a part thereof.
- a premetal insulating film 7 made of a silicon oxide-based insulating film or the like is formed, in which a local interconnect is formed. 8, that is, a tungsten plug 9 (Tungsten Plug) is embedded.
- a first interlayer insulating film 10 made of, for example, a silicon oxide insulating film or the like (for example, a non-porous Low-k insulating film) is formed.
- a copper-based first layer embedded wiring M1 is embedded therein.
- the local interconnect 8 (tungsten plug 9) and the high-concentration N-type source / drain region 5n are electrically connected to each other at the contact portion 6 (to the substrate or the gate electrode).
- An upper multilayer wiring layer 12 made of, for example, a silicon oxide insulating film or the like (for example, a porous low-k insulating film) is formed on the first interlayer insulating film 10 and the first layer embedded wiring M1. .
- the active regions forming the N-channel type MISFETs (planar gate type in this example) constituting each memory cell are basically all vertically long rectangles, and the widths thereof are made equal. Has the advantage of being easy.
- the equal width of the active region may be applied not only to the N-channel type MISFET but also to the P-channel type MISFET constituting each memory cell.
- the active regions that form the P-channel MISFETs (planar gate type in this example) constituting each memory cell are basically all vertically long rectangles, and the widths are active to form the N-channel MISFETs. Make it equal to the width of the region. If it does in this way, it has the merit that microfabrication becomes still easier.
- the active region in the P-type well region is relatively simple and has a rectangular structure (regardless of width and length). Suitable for processing. Moreover, since the length (vertical direction) is made the same, this point is also suitable for fine processing.
- This example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-5) to (2-9).
- FIG. 9 corresponds to FIG. 7 for explaining the modification 2 (A port type N-channel type MISFET active region wide type 3 port) concerning the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- FIG. 2 is an enlarged plan layout view (displaying up to 1-2 interlayer vias 21) of the memory cell region MC of FIG. 1; Based on this, a second modification (A-port N-channel MISFET active region wide three-port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application will be described.
- the widths of the active regions 18n3 and 18n4 forming the N channel driver MISFETs (DN11 and DN12) and the N channel access MISFETs (AN11 and AN12) are N channel type access MISFETs.
- the active regions 18n1 and 18n2 forming are wider than the width.
- the width of the active region of the A-port N-channel MISFET constituting each memory cell is made wider than the width of the active region of the B- and C-port N-channel MISFETs. Since the drive capability of the system driver transistor and access transistor is improved, the read and write speeds are improved. In addition, improvement in SNM (Static Noise Margin) characteristics can be expected.
- Modification 3 A port system high Vth-B & C port system low Vth type 3 port related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application (mainly FIG. 10)
- the example described in this section is a modification regarding the cell layout of the example described in the sections (2-1) and (2-2). Since the example described here is basically the same as the example described in the sections (2-1) and (2-2), only different parts will be described below in principle.
- the threshold voltages of some of the plurality of N-channel MISFETs constituting the cell are relatively high.
- the threshold voltages of the plurality of N-channel MISFETs constituting the cell are basically set to the same level.
- a difference may be provided in the threshold voltage in various modes.
- a mode in which the threshold voltages of the N-channel driver MISFET (DN11, DN12) and the N-channel access MISFET (AN11, AN12) are relatively increased will be described in detail. Needless to say, a mode in which the threshold voltage is relatively increased by a combination may be used.
- this example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-2) to (2-4) and sections (2-6) to (2-12). be able to.
- FIG. 10 corresponds to FIG. 5 for explaining Modification 3 (A port system high Vth-B & C port system low Vth type 3 port) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- 2 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. Based on this, a third modification (A port system high Vth-B & C port system low Vth type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application will be described.
- the P-type well region 4p is divided into high Vth regions HVth1 and HVth2 having relatively high threshold voltages.
- the threshold voltage is divided into low Vth regions LVth1 and LVth2. That is, the threshold voltages of the N-channel type driver MISFETs (DN11, DN12) and the N-channel type access MISFETs (AN11, AN12) are relatively increased, and the threshold voltages of the N-channel type access MISFETs (AN13, AN14, AN15, AN16) are increased. Is relatively low.
- the threshold voltage of the A port type N channel MISFET constituting each memory cell is set relatively higher than the threshold voltage of the B and C port type N channel MISFETs.
- the leakage current of the system can be reduced, and the B and C port systems can be set to relatively high-speed reading and high-speed writing.
- this example can be combined with various examples. For example, it can be combined with one or more of sections (2-2) to (2-5) and sections (2-7) to (2-12). be able to.
- FIG. 11 shows a memory cell region of FIG. 1 corresponding to FIG. 3 for explaining a modification 4 (low height cell structure 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application.
- FIG. 6 is a schematic circuit diagram of MC (displaying three cells in the vertical direction, that is, the bit line direction).
- FIG. 12 is an enlarged plan layout view (displaying up to the third layer embedded wiring) of the memory cell region MC1 of FIG. 11 and its periphery.
- FIG. 13 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. FIG.
- FIG. 14 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG.
- FIG. 15 is a schematic circuit diagram showing an example of a read circuit (also including a write circuit) corresponding to FIG.
- FIG. 16 is an enlarged plan layout view (up to the second layer embedded wiring is shown) in which the range of FIG. 12 is expanded to three adjacent cells in the upward direction.
- FIG. 17 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) corresponding to FIG. Based on these drawings, a description will be given of Modification Example 4 (low-height cell structure 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- Modification Example 4 low-height cell structure 3 port
- two sets of B-port and C-port bit line pairs are wired per cell column, and a B-port word line and a C-port word line (each second line) (One word line) is wired to two rows of cells one by one and interleaved.
- one A port word line (first word line) is wired independently for one row of cells, and one A port bit line pair is provided for each column. That is, the number of bit line pairs for the B port system and the C port system is doubled to reduce one word line. This is because, considering a horizontally long memory cell, even if the number of bit lines running vertically increases significantly, it is advantageous in terms of occupied area to reduce the number of word lines running horizontally.
- FIG. 11 basically shows three circuits shown in FIG. 3 arranged in the vertical direction. However, in some cases, in some cases, a vertical or horizontal inversion operation is involved in view of layout, wiring, and filling efficiency.
- the data storage portion SP in the memory cell region MC1 is provided with P-channel pull-up MISFETs (P11, P12), and one of these source / drain terminals is connected to the power supply wiring Vdd.
- the other is connected to the primary storage node SN and the inverted storage node SNB, respectively.
- One of the source and drain terminals of the N-channel type driver MISFET (DN11) is connected to the positive storage node SN, and the other is connected to the ground wiring Vss.
- one of the source / drain terminals of the N-channel type driver MISFET (DN12) is connected to the inverted storage node SNB, and the other is connected to the ground wiring Vss.
- the gate electrodes of the P-channel pull-up MISFET (P11) and the N-channel driver MISFET (DN11) are connected to the inversion storage node SNB, and the P-channel pull-up MISFET (P12) and the N-channel driver The gate electrode of the MISFET (DN12) is connected to the positive storage node SN.
- an A port word line WLA1 (first word line) and a B port word line WLB1 (second word line) are provided.
- the A port word line WLA1 is connected to the gate electrode of an N-channel access MISFET (AN11, AN12).
- the gate electrode of the N-channel access MISFET (AN13, AN14) is connected to the B port word line WLB1.
- the gate electrode of the N-channel access MISFET (AN15, AN16) is connected to the C port word line WLC1 (third word line) provided in the lower memory cell region.
- an A-port positive bit line BLA and an A-port inversion bit line BLAB that forms a complementary pair are provided in the column direction in the memory cell region MC1.
- One of the source and drain terminals of the N channel type access MISFET (AN11) is connected to the A port positive bit line BLA, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N channel type access MISFET (AN12) is connected to the A port inverted bit line BLAB, and the other is connected to the inverted storage node SNB.
- Port complementary write & read port
- a B port positive bit line BLB0 and a B port inversion bit line BLB0B forming a complementary pair are provided.
- One of the source and drain terminals of the N-channel access MISFET (AN13) is connected to the B port positive bit line BLB, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel access MISFET (AN14) is connected to the B port inverted bit line BLB0B, and the other is connected to the inverted storage node SNB.
- a type B port (complementary write & read port) is configured.
- a C port positive bit line BLC0 and a C port inversion bit line BLC0B forming a complementary pair are provided in the column direction in the memory cell region MC1.
- One of the source and drain terminals of the N-channel access MISFET (AN15) is connected to the C port positive bit line BLC0, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel type access MISFET (AN16) is connected to the C port inverted bit line BLC0B, and the other is connected to the inverted storage node SNB.
- a C port (complementary write & read port) of the mold is configured.
- the data storage portion SP in the memory cell region MC2 is provided with P-channel pull-up MISFETs (P21, P22), and one of these source / drain terminals is connected to the power supply wiring Vdd.
- the other is connected to the primary storage node SN and the inverted storage node SNB, respectively.
- One of the source and drain terminals of the N-channel type driver MISFET (DN21) is connected to the positive storage node SN, and the other is connected to the ground wiring Vss.
- one of the source and drain terminals of the N-channel type driver MISFET (DN22) is connected to the inverted storage node SNB, and the other is connected to the ground wiring Vss.
- the gate electrodes of the P-channel pull-up MISFET (P21) and the N-channel driver MISFET (DN21) are connected to the inverting storage node SNB, and the P-channel pull-up MISFET (P22) and the N-channel driver The gate electrode of the MISFET (DN22) is connected to the positive storage node SN.
- An A port word line WLA2 and a C port word line WLC2 are provided in the row direction in the memory cell region MC2.
- the A port word line WLA2 is connected to the gate electrode of an N-channel access MISFET (AN21, AN22).
- the gate electrode of the N channel type access MISFET (AN25, AN26) is connected to the C port word line WLC2.
- the gate electrode of the N channel type access MISFET (AN23, AN24) is connected to the B port word line WLB1 provided in the lower memory cell region MC1.
- an A port positive bit line BLA and an A port inverted bit line BLAB forming a complementary pair are provided in the column direction in the memory cell region MC2.
- One of the source and drain terminals of the N-channel access MISFET (AN21) is connected to the A port positive bit line BLA, and the other is connected to the positive storage node SN.
- one of the source / drain terminals of the N channel type access MISFET (AN22) is connected to the A port inverted bit line BLAB, and the other is connected to the inverted storage node SNB.
- Port (complementary write & read port) is configured.
- a B-port positive bit line BLB1 and a B-port inverted bit line BLB1B forming a complementary pair are provided.
- One of the source and drain terminals of the N channel type access MISFET (AN23) is connected to the B port positive bit line BLB1, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel access MISFET (AN24) is connected to the B port inverted bit line BLB1B, and the other is connected to the inverted storage node SNB, thereby complementing this cell.
- a type B port (complementary write & read port) is configured.
- a C port positive bit line BLC1 and a C port inversion bit line BLC1B forming a pair complementary thereto are provided in the column direction in the memory cell region MC2.
- One of the source and drain terminals of the N-channel access MISFET (AN25) is connected to the C port positive bit line BLC1, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel access MISFET (AN26) is connected to the C port inverted bit line BLC1B, and the other is connected to the inverted storage node SNB, thereby complementing this cell.
- a C port (complementary write & read port) of the mold is configured.
- P-channel pull-up MISFETs (P31, P32) are provided in the data storage portion SP of the memory cell region MC3, and one of these source / drain terminals is connected to the power supply wiring Vdd. The other is connected to the primary storage node SN and the inverted storage node SNB, respectively.
- One of the source and drain terminals of the N-channel type driver MISFET (DN31) is connected to the positive storage node SN, and the other is connected to the ground wiring Vss.
- one of the source and drain terminals of the N-channel type driver MISFET (DN32) is connected to the inverting storage node SNB, and the other is connected to the ground wiring Vss.
- the gate electrodes of the P-channel pull-up MISFET (P31) and the N-channel driver MISFET (DN31) are connected to the inversion storage node SNB, and the P-channel pull-up MISFET (P32) and the N-channel driver The gate electrode of the MISFET (DN32) is connected to the positive storage node SN.
- An A port word line WLA3 and a B port word line WLB2 are provided in the row direction in the memory cell region MC3.
- the A port word line WLA3 is connected to the gate electrode of an N-channel access MISFET (AN31, AN32).
- the gate electrode of the N channel type access MISFET (AN33, AN34) is connected to the B port word line WLB2.
- the gate electrode of the N channel type access MISFET (AN35, AN36) is connected to the C port word line WLC2 provided in the lower memory cell region MC21.
- an A-port positive bit line BLA and an A-port inverted bit line BLAB forming a complementary pair are provided in the column direction in the memory cell region MC3.
- One of the source and drain terminals of the N channel type access MISFET (AN31) is connected to the A port positive bit line BLA, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel access MISFET (AN32) is connected to the A port inverted bit line BLAB, and the other is connected to the inverted storage node SNB.
- Port (complementary write & read port) is configured.
- a B port positive bit line BLB0 and a B port inversion bit line BLB0B forming a complementary pair are provided.
- One of the source and drain terminals of the N-channel access MISFET (AN33) is connected to the B-port positive bit line BLB0, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel access MISFET (AN34) is connected to the B port inverted bit line BLB0B, and the other is connected to the inverted storage node SNB, thereby complementing this cell.
- a type B port (complementary write & read port) is configured.
- a C port positive bit line BLC0 and a C port inversion bit line BLC0B forming a pair complementary thereto are provided.
- One of the source and drain terminals of the N-channel type access MISFET (AN35) is connected to the C port positive bit line BLC0, and the other is connected to the positive storage node SN.
- one of the source and drain terminals of the N-channel type access MISFET (AN36) is connected to the C port inverted bit line BLC0B, and the other is connected to the inverted storage node SNB.
- a C port (complementary write & read port) of the mold is configured.
- bit line pairs are different from each other in the memory cells adjacent vertically. In other words, every other B and C port bit line pair is the same for every other memory cell lined up and down.
- one word line provided in one memory cell is an A port word line, and the other is a B port word line for each memory cell adjacent in the vertical direction.
- C port system word lines are alternately switched.
- the access MISFET related to the port of the same system is controlled by the word line related to the port of the same system as in the other examples.
- Each bit line BLA, BLB0, BLB1, BLC0, BLC1, BLAB, BLB0B, BLB1B, BLC0B, BLC1B, power supply wiring Vdd, ground wiring Vss, and the like are formed by the second layer embedded wiring M2.
- relatively long wirings in the vertical direction such as second layer through wirings TW21 and TW22 such as signal wirings for logic circuits passing over the embedded SRAM region EM are embedded in the second layer. It is formed by the wiring M2.
- the second layer embedded wiring M2 is formed by, for example, a dual damascene method.
- the second-layer buried wiring M2 is also used as an intermediate metal layer between the upper and lower conductive layers.
- Each word line WLA1, WLB1 is formed by a third layer embedded wiring M3 in this example.
- the third layer embedded wiring M3 is formed by, for example, a dual damascene method.
- the B port (C port is equivalent to the B port and A port is a standard one) will be described with reference to FIG. Briefly, read and write operations will be described.
- the B port word line WLB1 is activated, and the information in the memory cell MC1 is read to the B port positive bit line BLB0 and the B port inverted bit BLB0B.
- the column decoder circuit CD is controlled by the address data AD, and the information read to the B port positive bit line BLB0 and the B port inversion bit BLB0B is inverted via the column decoder circuit CD, respectively. It is transmitted to the data line DLB.
- Information on the positive data line DL and the inverted data line DLB is amplified by, for example, a sense amplifier SAL such as a latch-type sense amplifier.
- the information amplified by the sense amplifier SAL is converted into, for example, a single-ended signal by the data output control circuit RB, and output to the outside of the SRAM circuit EM as a read data signal RS.
- the B port word line WLB1 When writing to the memory cell MC1, first, the B port word line WLB1 is activated, and single-ended write information WS is input from the outside of the SRAM circuit EM, and the write drive circuit WD is passed through the data input control circuit WB. To be supplied.
- the write drive circuit WD supplies the write information WS to the positive data line DL and the inverted data line DLB as a full swing complementary write pair signal, respectively.
- This write signal is transmitted to the B port positive bit line BLB0 and the B port inversion bit BLB0B through the column decoder circuit CD, and is written into the memory cell MC1.
- the B port word line WLB1 is activated, and the information in the memory cell MC2 is read to the B port positive bit line BLB1 and the B port inversion bit BLB1B.
- the column decoder circuit CD is controlled by the address data AD, and the information read to the B port positive bit line BLB1 and the B port inversion bit BLB1B is inverted via the column decoder circuit CD to the positive data line DL and the inverted data, respectively. It is transmitted to the data line DLB.
- Information on the positive data line DL and the inverted data line DLB is amplified by, for example, a sense amplifier SAL such as a latch-type sense amplifier.
- the information amplified by the sense amplifier SAL is converted into, for example, a single-ended signal by the data output control circuit RB, and output to the outside of the SRAM circuit EM as a read data signal RS.
- the B port word line WLB1 becomes active, and single-ended write information WS is input from the outside of the SRAM circuit EM, and the write drive circuit WD is passed through the data input control circuit WB. To be supplied.
- the write drive circuit WD supplies the write information WS to the positive data line DL and the inverted data line DLB as a full swing complementary write pair signal, respectively.
- This write signal is transmitted to the B port positive bit line BLB1 and the B port inversion bit BLB1B via the column decoder circuit CD, and is written into the memory cell MC2.
- FIG. 16 and FIG. 17 are plan layout diagrams relating to the three memory cell regions MC1, MC2 and MC3 arranged in the vertical direction corresponding to FIG. A supplementary explanation will be given regarding the layout.
- the basic concept of layout is as follows. That is, (1) Since one of the word lines for controlling a certain memory cell is in, for example, a memory cell adjacent to the lower side, a vertical wiring having a length similar to the width of the memory cell (in this example, The second layer embedded wiring M2) is required.
- the gate electrode of the N-channel access MISFET (AN23, AN24) is, for example, B in the memory cell region MC1 via the second layer embedded wiring M2. It is connected to the port word line WLB1.
- two B port bit line pairs and two C port bit line pairs are prepared, and one B port word line and one C port word line are prepared for two rows of memory cells. And they are interleaved. As a result, the number of metal word lines (third-layer embedded wiring) running in the horizontal direction is two per row, which is effective in reducing the cell height.
- sections (2-3) to (2-5), (2-8) and (2-10) to (2-12) can be combined with one or more.
- FIG. 18 shows the memory cell of FIG. 1 corresponding to FIG. 11 for explaining Modification 5 (partial single-ended bit line configuration 4 ports) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- FIG. 5 is a schematic circuit diagram of a region MC (displaying three cells in the vertical direction, that is, the bit line direction).
- FIG. 19 is an enlarged plan layout view (displaying up to the third layer embedded wiring) of the memory cell region MC1 of FIG. 18 and its periphery.
- FIG. 20 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. FIG.
- FIG. 21 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG.
- FIG. 22 is a schematic circuit diagram (C port system single-ended bit line) showing an example of a read circuit corresponding to FIG.
- FIG. 23 is a schematic circuit diagram (D port system single-ended bit line) showing an example of a read circuit corresponding to FIG.
- FIG. 24 is an enlarged plan layout view (up to the second layer embedded wiring is shown) showing the range of FIG. 19 expanded to three adjacent cells in the upward direction.
- FIG. 25 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) corresponding to FIG. FIG.
- 26 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) corresponding to FIG. Based on these, a fifth modification (partial single-ended bit line configuration, four ports) relating to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application will be described.
- the A port bit line (first and second bit lines) and the B port bit line (third and fourth bit lines) are bit line pairs that form a pair with each other. is there.
- the C port bit line (fifth bit line) and the D port bit line (sixth bit line) are bit lines that do not form a pair with each other.
- FIG. 19 the planar layout of the unit memory cell region MC in this example is shown in FIG. 19 (corresponding to FIG. 12) to FIG. 21 and FIG. 24 to FIG.
- FIG. 19 the planar layout of the unit memory cell region MC in this example is shown in FIG. 19 (corresponding to FIG. 12) to FIG. 21 and FIG. 24 to FIG.
- FIG. 19 when referring to the memory cell in the vertical direction, above or below, it indicates the extending direction of the bit line.
- the word lines WLA ⁇ b> 1 and WLC ⁇ b> 1 cross.
- the word line WLB1 (third word line) extends in the vicinity of the upper cell boundary along the boundary.
- the word line WLA1 controls the A port system access transistor in the memory cell region MC1
- the word line WLC1 controls the C port system access transistor of this memory cell and the lower memory cell. Yes.
- the word line WLB1 controls the B port access transistor of this memory cell and the upper memory cell.
- a word line WLD1 (fourth word line) is provided so as to cross the cells in parallel with these word lines.
- the word line WLD1 controls the D port access transistors of this memory cell and the lower memory cell. That is, the access transistors in the memory cell region MC1 are controlled by these four word lines.
- the word lines WLA2 and WLD2 cross, and the word line WLB1 (third word line) is The vicinity of the lower cell boundary extends along the boundary.
- the word line WLA2 controls the A port system access transistor in the memory cell region MC2
- the word line WLD2 controls the D port system access transistor of this memory cell and the upper memory cell.
- the word line WLB1 controls the B port access transistor of this memory cell and the lower memory cell.
- a word line WLC2 (fourth word line) is provided so as to cross the cell in parallel with these word lines.
- the word line WLC2 controls the access transistor of the C port system of this memory cell and the upper memory cell. That is, the access transistor in the memory cell region MC2 is controlled by these four word lines.
- the word lines WLA3 and WLC2 cross, and the word line WLB2 (third word line) is The vicinity of the upper cell boundary extends along the boundary.
- the word line WLA3 controls the A port access transistor in the memory cell region MC3
- the word line WLC2 controls the C port access transistor of this memory cell and the lower memory cell.
- the word line WLB2 controls the B port access transistors of this memory cell and the upper memory cell.
- a word line WLD2 (fourth word line) is provided so as to cross the cell in parallel with these word lines.
- the word line WLD2 controls the D port access transistors of the memory cell and the lower memory cell. That is, the access transistor in the memory cell region MC3 is controlled by these four word lines.
- the column control circuit region CD selects one of the C port positive bit lines BLC0 and BLC1 based on the address signal AD.
- the information read to the positive data line DL is amplified by the single end sense amplifier SAS and output to the data output control circuit RB, where it is latched and the like, and is read out as a read signal RS in the embedded SRAM region EM (FIG. 1). Output to the outside.
- the column control circuit region CD selects one of the D port inversion bit lines BLD0B and BLD1B based on the address signal AD.
- the information read out to the inverted data line DLB is amplified by the single end sense amplifier SAS, output to the data output control circuit RB, where it is latched and inverted, and then inverted as the read signal RS as the embedded SRAM region EM. It is output outside (FIG. 1).
- the C port having a single-ended bit line configuration by multiplexing the B and C port system bit lines and interleaving the B and C port system word lines and further dividing the C port system bit line pair. Since the system bit line and the D port system bit line are used, the number of word lines is 2.5 per cell. Therefore, compared with the section (2-6), in exchange for a slight increase in the cell area, two single-ended ports (write & read ports) are secured while securing two high-speed differential ports (write & read ports). Read-only port) can be added.
- this example can be combined with various examples. For example, it can be combined with one or more of sections (2-3) to (2-7) and sections (2-9) to (2-12). be able to.
- FIG. 27 is an enlarged view of the memory cell region MC of FIG. 1 for explaining a modification 6 (first layer power supply vertical wiring configuration 3 ports) relating to the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application.
- FIG. 6 is a plan layout view (displaying up to 1-2 interlayer via 21).
- FIG. 28 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. Based on these, a sixth modification (first layer power supply vertical wiring configuration 3 ports) relating to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application will be described.
- This example is basically the same as that described with reference to FIG. 9, but as shown in FIGS. 27 and 28, a part of the portion interconnected by the first layer embedded wiring M ⁇ b> 1 is replaced with the LIC (8 a, 8b, 8c, 8d) is characterized in that the power supply wiring Vdd (power supply wiring) in the central portion of each memory cell region MC1 is configured by the first layer embedded wiring M1.
- Vdd power supply wiring
- the power supply wiring by the first layer embedded wiring is vertically passed through the central portion of the N-type well region 4n (first conductivity type well region), the second layer is formed in the peripheral portion thereof.
- the embedded wiring can be freely used for signal wiring or the like.
- This example can be combined with various examples. For example, it can be combined with one or more of sections (2-2) to (2-8) and sections (2-10) to (2-12). be able to.
- FIG. 29 shows a memory cell region MC of FIG. 1 for explaining a modification 7 (B & C port system access MISFET mutual upside down 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application. It is an enlarged plan layout view (displays up to the third layer embedded wiring).
- FIG. 30 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG.
- FIG. 31 is an enlarged plan layout view (mainly showing the second layer embedded wiring M2 and the third layer embedded wiring M3) of the memory cell region MC of FIG. 1 corresponding to FIG. Based on these, a seventh modification (B & C port access MISFET mutual upside down three ports) concerning the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application will be described.
- N-channel access MISFETs (AN13, AN15)
- the N-channel access MISFETs (AN14, AN16) are characterized in that the upper and lower positional relations are mutually inverted.
- the B port system and C port system access transistors are vertically inverted in one P type well region (second conductivity type well region), the B port system and C port system The load capacity balance of the bit line pair can be improved.
- the bulk type is described as an example of the FIN type MISFET, but it goes without saying that the SOI type may be used.
- the bulk method has an advantage that the process is simple. This is the same in the following sections.
- this example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-2) to (2-9).
- FIG. 32 is an enlarged plan layout view of the memory cell region MC of FIG. 1 for explaining a modification 8 (FIN basic type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present invention.
- 1-2 displays the interlayer via 21).
- FIG. 33 is a device perspective view showing an example of a three-dimensional shape of the FIN-type MIFET of FIG. Based on these, a description will be given of Modification Example 8 (FIN basic type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- the active regions 18n1, 18n2, 18n3, and 18n4 in which the N-type source / drain regions and the like are formed have a vertically long rectangular shape, as in FIG. In particular, they are separated from each other by the STI region 3 (element isolation region) and are arranged vertically in the P-type well region 4p.
- the planar widths of the active regions 18n1, 18n2, 18n3, and 18n4 are made equal. This facilitates lithography.
- each N-channel MISFET (DN11, DN12, AN11, AN12, AN13, AN14, AN15, AN16) and each P-channel MISFET (P11, P12) are defined as FIN-type MISFETs.
- the P-channel type MISFETs (P11, P12) are first and second pull-up MISFETs, respectively.
- STI region 3 element isolation region
- the gate electrode 16 straddles the gate insulating film 15 in a direction orthogonal to the fins 17, and the fins 17 on both sides serve as a source region 17s and a drain region 17d, respectively.
- the apparent active region width is narrow, but since both sides also contribute effectively, a relatively wide effective active region width (ie, gate width). Width) can be secured.
- active area width simply refers to “apparent width”, ie, “planar width of the active area”.
- the width of the active region and the height of the fin are the same for both the N-channel type MISFET and the P-channel type pull-up MISFET. This is because in that case, fine processing is easier due to the structure of the FIN type transistor.
- the width of the active region and the height of the fin may be different between the N-channel type MISFET and the P-channel type pull-up MISFET, respectively.
- the N-channel MISFET and the P-channel MISFET (not limited to the pull-up MISFET) constituting each memory cell are FIN-type MISFETs, so that miniaturization is possible while ensuring driving capability. Become.
- this example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-2) to (2-9).
- FIG. 34 corresponds to FIG. 3 for explaining Modification 8 (data storage unit N-channel type MISFET total parallel FIN type 3-port) related to the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- FIG. 2 is a schematic circuit diagram of a memory cell region MC in FIG. 1.
- FIG. 35 is an enlarged plan layout view (displaying up to 1-2 interlayer via 21) of memory cell region MC of FIG. 1 corresponding to FIG. Based on these, a description will be given of Modification 8 (data storage unit N-channel MISFET total parallel FIN type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application.
- each N-channel type MISFET (DN11, DN12, AN11, AN12) is a parallel type MISFET. It is an additional feature.
- the active regions 18n1, 18n2, 18n31, 18n32, 18n41, and 18n42 in which the N-type source / drain regions and the like are formed have a vertically long rectangular shape, These are separated from each other by the STI region 3 (element isolation region) and arranged vertically in the P-type well region 4p.
- the planar widths of the active regions 18n1, 18n2, 18n3, and 18n4 are made equal. This facilitates lithography.
- the consistency with the FIN process is ensured.
- the driving capability of the port-type N-channel MISFET can be improved. This makes it possible to further speed up the writing and reading of the A port system.
- the write margin from the A port system can be improved.
- this example can be combined with various examples. For example, it can be combined with one or a plurality of sections (2-2) to (2-9).
- FIG. 36 is a memory of FIG. 1 corresponding to FIG. 34 for explaining a modification 9 (A port type access MISFET parallel FIN type 3 port) concerning the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the embodiment of the present application. It is a schematic circuit diagram of the cell region MC.
- FIG. 37 is an enlarged plan layout view (up to the 1-2 interlayer via 21) of the memory cell region MC of FIG. 1 corresponding to FIG. Based on these, a modification 9 (A port access MISFET parallel FIN type 3 port) regarding the cell layout of the embedded SRAM in the semiconductor integrated circuit device of the one embodiment of the present application will be described.
- each N-channel MISFET (AN11, AN12) is a parallel MISFET. Characteristic.
- the active regions 18n1, 18n2, 18n31, 18n32, 18n41, and 18n42 in which the N-type source / drain regions and the like are formed have a vertically long rectangular shape, These are separated from each other by the STI region 3 (element isolation region) and arranged vertically in the P-type well region 4p.
- the planar widths of the active regions 18n1, 18n2, 18n3, and 18n4 are made equal. This facilitates lithography.
- the write margin from the A-port system can be improved. it can. Further, parallelization is only for N-channel access MISFETs, and an increase in standby leakage current can be suppressed as compared with the example in section (2-11).
- FIG. 38 is a schematic circuit configuration diagram of the embedded SRAM region EM for explaining the outline of the embedded SRAM in the semiconductor integrated circuit device according to the embodiment of the present application. Based on this, a supplementary explanation regarding the above-described embodiment (including modifications) and a general consideration will be given.
- a multi-port SRAM is mounted together with a logic circuit such as a digital signal processing circuit.
- a logic circuit such as a digital signal processing circuit.
- 1 port is a differential write & read port
- 2 ports are single-ended read only ports.
- the occupied area of the embedded SRAM is reduced in this configuration, the number of write & read ports is limited to one.
- high-speed read as high as differential read is possible. It became clear that there was a problem that the characteristics could not be expected.
- the multi-port embedded SRAM memory cell of the semiconductor integrated circuit device has a configuration as shown in FIG. That is, in the memory cell structure of the embedded SRAM, it has three differential write & read ports, for example, an N well region (or first conductivity type well region) is arranged in the center of the cell, P well regions (or well regions of the second conductivity type) are arranged on both sides. Specifically, as shown in FIG. 38, in the embedded SRAM region EM, three pairs of bit lines BLA, BLAB, BLB, BLBB, BLC, and BLCB are provided for each column.
- the memory cell arrangement region MA in the embedded SRAM region EM has a matrix shape so that the extending direction of the bit lines BLA, BLAB, BLB, BLBB, BLC, and BLCB is orthogonal to the long side (SL).
- a large number of memory cell regions MC are arranged. That is, the three pairs of bit lines BLA, BLAB, BLB, BLBB, BLC, and BLCB extend along the short side SS of the memory cell region MC.
- a central portion of each memory cell region MC is, for example, an N-type well region 4n (first conductivity type well region), and both sides thereof are a P-type well region 4p (second conductivity type well region). Has been.
- the vertical structure of the device (mainly a structure other than the planar layout) is other than the planar gate (sections (2-10) to (2-12)).
- the planar gate (sections (2-10) to (2-12)).
- source / drain structure has been shown in a simplified manner, it is needless to say that an elevated source / drain (Elevated Source Drain) region may be used.
- elevated source / drain Elevated Source Drain
- the P-channel type MISFET has been described on the assumption that it has a Si-based source / drain region in order to ensure simplicity, but a SiGe-based source / drain also has a Si-based source / drain region. Needless to say, it may have a region.
- a P-type single crystal silicon substrate has been specifically described as an example of a semiconductor substrate.
- an N-type single crystal silicon substrate can be used for P-type and N-type.
- an intrinsic type single crystal silicon substrate may also be used.
- the semiconductor substrate is not limited to a single crystal substrate but may be an SOI substrate.
- First main surface or surface (device surface) of an integrated circuit chip or semiconductor substrate 1b First main surface or back surface (integrated circuit chip or semiconductor substrate) 1s P-type single crystal silicon region (substrate region of semiconductor substrate) 2 Semiconductor chip (integrated circuit chip or semiconductor substrate) 3 STI region (element isolation region) 4n N-type well region (first conductivity type well region) 4p P-type well region (second conductivity type well region) 5n High-concentration N-type source / drain region 6 Contact portion (with substrate or gate electrode) 7 Premetal insulating film 8, 8a, 8b, 8c, 8d LIC (Local Interconnect) 9 Tungsten plug DESCRIPTION OF SYMBOLS 10 1st layer interlayer insulation film 12 Upper layer multilayer wiring layer 15 Gate insulation film 16 Gate electrode 17 Fin (Fin) 17 d Fin drain region 17 s Fin source region 18 Active region 18 n 1, 18 n 2, 18 n 3, 18 n 21, 18 n 32, 18 n 4, 18 n 41, 18 n
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Abstract
Description
1-1.実施の形態の概要
先ず、本願において開示される代表的な実施の形態について概要を説明する。
(a)第1の主面を有する半導体基板;
(b)前記半導体基板の前記第1の主面側に設けられた埋め込みSRAM領域;
(c)前記SRAM領域内に設けられたメモリセル配置領域;
(d)前記メモリセル配置領域内にマトリクス状に設けられた多数のメモリセル領域、
ここで、各メモリセル領域は、平面的に見て長辺および短辺を有する長方形形状を有し、以下を含む:
(d1)前記長辺に関して、中央部に設けられた第1導電型を有する第1のウエル領域;
(d2)前記長辺に関して、前記第1のウエル領域の両側に設けられた第2導電型を有する第2のウエル領域および第3のウエル領域;
(d3)前記長辺と直交する方向に延在し、相互に相補的な対を成す第1のビット線および第2のビット線;
(d4)前記長辺と直交する方向に延在し、相互に相補的な対を成す第3のビット線および第4のビット線;
(d5)前記長辺と直交する方向に延在し、相互に相補的な対を成す第5のビット線および第6のビット線。
(d6)データ記憶部;
(d7)前記データ記憶部に設けられた第1の記憶ノード;
(d8)前記データ記憶部に設けられ、前記第1の記憶ノードと相補的な第2の記憶ノード;
(d9)前記データ記憶部であって、前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のドライバMISFET;
(d10)前記データ記憶部であって、前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のドライバMISFET;
(d11)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第1のビット線に接続された第1のアクセスMISFET;
(d12)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第2のビット線に接続された第2のアクセスMISFET;
(d13)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第3のビット線に接続された第3のアクセスMISFET;
(d14)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第4のビット線に接続された第4のアクセスMISFET;
(d15)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第5のビット線に接続された第5のアクセスMISFET;
(d16)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第6のビット線に接続された第6のアクセスMISFET。
(d17)前記第1のドライバMISFETおよび前記第1のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第1のアクティブ領域;
(d18)前記第3のアクセスMISFETおよび前記第5のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第2のアクティブ領域;
(d19)前記第2のドライバMISFETおよび前記第2のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第3のアクティブ領域;
(d20)前記第4のアクセスMISFETおよび前記第6のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第4のアクティブ領域。
(d21)前記第1のアクティブ領域と前記第2のアクティブ領域の不純物領域を相互に連結する第1のローカルインタコネクト;
(d22)前記第3のアクティブ領域と前記第4のアクティブ領域の不純物領域を相互に連結する第2のローカルインタコネクト。
(d23)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のプルアップMISFET;
(d24)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のプルアップMISFET;
(d25)前記第1のプルアップMISFETおよび前記第2のプルアップMISFETの他方の端子に接続され、前記長辺と直交する方向に延在し、第1層埋め込み配線から構成された電源供給配線。
(d23)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のプルアップMISFET;
(d24)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のプルアップMISFET、
ここで、各メモリセル領域を構成する全てのMISFETは、Fin型FETで構成されている。
(x1)各メモリセル領域の前記第3のビット線および前記第4のビット線と、前記長辺と直交する方向において、このメモリセル領域に隣接するメモリセル領域の前記第3のビット線および前記第4のビット線は、異なるものであり;
(x2)各メモリセル領域の前記第5のビット線および前記第6のビット線と、前記長辺と直交する方向において、このメモリセル領域に隣接するメモリセル領域の前記第5のビット線および前記第6のビット線は、異なるものである。
(d26)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、当該メモリセル領域の前記第1のアクセスMISFETおよび前記第2のアクセスMISFETを制御する第1のワード線;
(d27)当該メモリセル領域の上下方向に隣接するメモリセル領域内に於いて前記長辺と平行な方向に延在し、この隣接メモリセル領域および当該メモリセル領域の前記第3のアクセスMISFETおよび前記第4のアクセスMISFETを制御する第2のワード線;
(d28)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、当該メモリセル領域および当該メモリセル領域の上下方向に隣接するメモリセル領域の前記第5のアクセスMISFETおよび前記第6のアクセスMISFETを制御する第3のワード線。
(a)第1の主面を有する半導体基板;
(b)前記半導体基板の前記第1の主面側に設けられた埋め込みSRAM領域;
(c)前記SRAM領域内に設けられたメモリセル配置領域;
(d)前記メモリセル配置領域内にマトリクス状に設けられた多数のメモリセル領域、
ここで、各メモリセル領域は、平面的に見て長辺および短辺を有する長方形形状を有し、以下を含む:
(d1)前記長辺に関して、中央部に設けられた第1のウエル領域;
(d2)前記長辺に関して、前記第1のウエル領域の両側に設けられた第2のウエル領域および第3のウエル領域;
(d3)前記長辺と直交する方向に延在し、相互に相補的な対を成す第1のビット線および第2のビット線;
(d4)前記長辺と直交する方向に延在し、相互に相補的な対を成す第3のビット線および第4のビット線;
(d5)前記長辺と直交する方向に延在し、相互に相補的な対を成さない第5のビット線および第6のビット線。
(d6)データ記憶部;
(d7)前記データ記憶部に設けられた第1の記憶ノード;
(d8)前記データ記憶部に設けられ、前記第1の記憶ノードと相補的な第2の記憶ノード;
(d9)前記データ記憶部であって、前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のドライバMISFET;
(d10)前記データ記憶部であって、前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のドライバMISFET;
(d11)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第1のビット線に接続された第1のアクセスMISFET;
(d12)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第2のビット線に接続された第2のアクセスMISFET;
(d13)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第3のビット線に接続された第3のアクセスMISFET;
(d14)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第4のビット線に接続された第4のアクセスMISFET;
(d15)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第5のビット線に接続された第5のアクセスMISFET;
(d16)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第6のビット線に接続された第6のアクセスMISFET。
(d17)前記第1のドライバMISFETおよび前記第1のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第1のアクティブ領域;
(d18)前記第3のアクセスMISFETおよび前記第5のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第2のアクティブ領域;
(d19)前記第2のドライバMISFETおよび前記第2のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第3のアクティブ領域;
(d20)前記第4のアクセスMISFETおよび前記第6のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第4のアクティブ領域。
(d21)前記第1のアクティブ領域と前記第2のアクティブ領域の不純物領域を相互に連結する第1のローカルインタコネクト;
(d22)前記第3のアクティブ領域と前記第4のアクティブ領域の不純物領域を相互に連結する第2のローカルインタコネクト。
(d23)当該メモリセル領域内において前記長辺と平行な方向に延在し、当該メモリセル領域の前記第1のアクセスMISFETおよび前記第2のアクセスMISFETを制御する第1のワード線;
(d24)当該メモリセル領域と上下方向に隣接するメモリセル領域の境界領域又はその近傍に於いて前記長辺と平行な方向に延在し、これらのメモリセル領域の前記第3のアクセスMISFETおよび前記第4のアクセスMISFETを制御する第2のワード線;
(d25)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、このメモリセル領域と上下方向に隣接するメモリセル領域の前記第5のアクセスMISFETを制御する第3のワード線;
(d26)当該メモリセル領域と上下方向に隣接するメモリセル領域内において前記長辺と平行な方向に延在し、これらのメモリセル領域の前記第6のアクセスMISFETを制御する第4のワード線。
1.本願において、実施の態様の記載は、必要に応じて、便宜上複数のセクションに分けて記載する場合もあるが、特にそうでない旨明示した場合を除き、これらは相互に独立別個のものではなく、単一の例の各部分、一方が他方の一部詳細または一部または全部の変形例等である。また、原則として、同様の部分は繰り返しを省略する。また、実施の態様における各構成要素は、特にそうでない旨明示した場合、理論的にその数に限定される場合および文脈から明らかにそうでない場合を除き、必須のものではない。
実施の形態について更に詳述する。各図中において、同一または同様の部分は同一または類似の記号または参照番号で示し、説明は原則として繰り返さない。
このセクションで示すチップレイアウト等は、セクション(2-2)で説明するセルレイアウトを適用する半導体集積回路装置の一例であり、これ以外の形態でも、種々利用できることはいうまでもない。以下では、主に、埋め込み型(Embedded)SRAMを例にとり、具体的に説明するが、以下の各種の例は、汎用SRAMすなわち、専用SRAM等の非埋め込み型SRAMにも適用できることは言うまでもない。
このセクションでは、セクション(2-1)で説明した点を踏まえて、セクション(2-3)以降で説明する変形例の基礎となる全相補ビット線構成3ポートSRAMのセルレイアウトを説明する。
(1)メモリセル領域MC1の中央部に、第1及び第2のプルアップMISFETすなわちPチャネル型プルアップMISFET(P11、P12)を形成するためのN型ウエル領域4n(第1導電型の第1のウエル領域)を配置する。そして、この例に於いては、N型ウエル領域4nの左側に、Nチャネル型ドライバMISFET(DN11)、Nチャネル型アクセスMISFET(AN11、AN13、AN15)を形成するためのP型ウエル領域4p(第2導電型の第2のウエル領域)を配置する。同様に、N型ウエル領域4nの右側に、Nチャネル型ドライバMISFET(DN12)、Nチャネル型アクセスMISFET(AN12、AN14、AN16)を形成するためのもう一つのP型ウエル領域4p(第2導電型の第3のウエル領域)を配置する。なお、左右のP型ウエル領域4pは、相互に連結されていても良い。
このセクションでは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例を説明する。
(1)N型ソースドレイン領域等が形成されるアクティブ領域18n1、18n2、18n3、18n4は、この例では、それぞれ縦長の長方形形状をしており、幾何学的にSTI領域3(素子分離領域)によって相互に分離されて、P型ウエル領域4p内に縦長に配置されている。そして、この例に於いては、各アクティブ領域18n1、18n2、18n3、18n4(それぞれ、第2のアクティブ領域、第4のアクティブ領域、第1のアクティブ領域および第3のアクティブ領域)の幅は、等しくされている。これにより、リソグラフィが容易となる。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-3)で説明した例の変形例と見ることもできる。ここで説明する例は、基本的に、セクション(2-3)で説明した例と同じであるから、以下では原則として、異なる部分のみを説明する。
このセクションで説明する例は、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例である。ここで説明する例は、基本的に、セクション(2-1)および(2-2)で説明した例と同じであるから、以下では原則として、異なる部分のみを説明する。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-3)で説明した例の変形例と見ることもできる。
(1)各ビット線BLA、BLB0、BLB1、BLC0、BLC1、BLAB、BLB0B、BLB1B、BLC0B、BLC1B、電源配線Vdd、接地配線Vss等は、第2層埋め込み配線M2によって形成されている。更に、たとえばロジック回路用の信号配線等の内、埋め込みSRAM領域EM上を通過するもの等の第2層スルー(Through)配線TW21、TW22等の縦方向の比較的長い配線は、第2層埋め込み配線M2によって形成されている。第2層埋め込み配線M2は、たとえば、デュアルダマシン方式により形成されている。また、この例においては、第2層埋め込み配線M2は、上下の導電層間の仲介メタル層としても利用されている。
(1)あるメモリセルを制御するワード線のうち、1本は、たとえば、下方に隣接するメモリセルにあるので、メモリセルの幅と同程度の長さの縦方向の配線(この例では、第2層埋め込み配線M2)を必要とする。従って、たとえば、メモリセル領域MC2を例に取り説明するとすれば、Nチャネル型アクセスMISFET(AN23、AN24)のゲート電極は、たとえば、第2層埋め込み配線M2を介してメモリセル領域MC1にあるBポートワード線WLB1に接続されている。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-6)で説明した例の変形例と見ることもできる。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-4)で説明した例の変形例と見ることもできる。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例である。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-3)で説明した例の変形例と見ることもできる。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-10)で説明した例の変形例と見ることもできる。
このセクションで説明するものは、セクション(2-1)および(2-2)で説明した例のセルレイアウトに関する変形例に属するが、直接的には、セクション(2-11)で説明した例の変形例と見ることもできる。
図38は本願の前記一実施の形態の半導体集積回路装置における埋め込みSRAMのアウトラインを説明するための埋め込みSRAM領域EMの模式的回路構成図である。これに基づいて、前記実施の形態(変形例を含む)に関する補足的説明並びに全般についての考察を行う。
先に説明したように、画像情報等を処理するチップにおいては、デジタル信号処理回路等のロジック回路とともに、マルチポートのSRAMを混載することが行われている。その際、たとえば、3ポートであれば、1ポートを差動書き込み&読み出しポートとして、2ポートをシングルエンド読み出し専用ポートとするものがある。しかし、本願発明者が検討したところによると、この構成では、埋め込みSRAMの占有面積は小さくなるものの、書き込み&読み出しポートが一つに限られるほか、シングルエンド読み出しでは、差動読み出しほどの高速読み出し特性は期待できないとの問題があることが明らかとなった。
そこで、前記一実施の形態の半導体集積回路装置のマルチポート埋め込みSRAMのメモリセルにおいては、図38に示すような構成としている。すなわち、埋め込みSRAMのメモリセル構造に於いて、3個の差動書き込み&読み出しポートを有し、セル中央に、たとえば、Nウエル領域(または、第1導電型のウエル領域)を配し、その両側に、Pウエル領域(または、第2導電型のウエル領域)を配するものである。具体的には、図38に示すように、埋め込みSRAM領域EM内には、3対のビット線BLA、BLAB、BLB、BLBB、BLC、BLCBが列ごとに設けられている。また、埋め込みSRAM領域EM内のメモリセル配置領域MAには、このビット線BLA、BLAB、BLB、BLBB、BLC、BLCBの延在方向と、その長辺(SL)が直交するように、マトリクス状に多数のメモリセル領域MCが配置されている。すなわち、3対のビット線BLA、BLAB、BLB、BLBB、BLC、BLCBは、メモリセル領域MCの短辺SSに沿うように延在している。そして、各メモリセル領域MCの中央部は、たとえば、N型ウエル領域4n(第1導電型ウエル領域)とされており、その両側は、P型ウエル領域4p(第2導電型ウエル領域)とされている。
以上本発明者によってなされた発明を実施形態に基づいて具体的に説明したが、本発明はそれに限定されるものではなく、その要旨を逸脱しない範囲において種々変更可能であることは言うまでもない。
1b (集積回路チップまたは半導体基板の)第1の主面または裏面
1s P型単結晶シリコン領域(半導体基板の基板領域)
2 半導体チップ(集積回路チップまたは半導体基板)
3 STI領域(素子分離領域)
4n N型ウエル領域(第1導電型ウエル領域)
4p P型ウエル領域(第2導電型ウエル領域)
5n 高濃度N型ソースドレイン領域
6 (基板またはゲート電極との)コンタクト部
7 プリメタル(Premetal)絶縁膜
8、8a、8b、8c、8d LIC(Local Interconnect)
9 タングステンプラグ(Tungsten Plug)
10 第1層層間絶縁膜
12 上層多層配線層
15 ゲート絶縁膜
16 ゲート電極
17 フィン(Fin)
17d フィンのドレイン領域
17s フィンのソース領域
18 アクティブ領域
18n1、18n2、18n3、18n21、18n32、18n4、18n41、18n42 N型ソースドレイン領域等が形成されるアクティブ領域
18p1、18p2 P型ソースドレイン領域等が形成されるアクティブ領域
21 1-2層間ビア
22 2-3層間ビア
AD アドレスデータ(アドレス信号)
AN11、AN12、AN13、AN14、AN15、AN16、AN21、AN22、AN23、AN24、AN125、AN26、AN31、AN32、AN33、AN34、AN35、AN36 Nチャネル型アクセスMISFET
AR アナログ回路領域
BL ビット線(Bitline)
BLA Aポート(Port)正(True)ビット線
BLAB Aポート反転(Complementary)ビット線
BLB、BLB0、BLB1 Bポート正ビット線
BLB0B、BLB1B、BLBB Bポート反転ビット線
BLC、BLC0、BLC1 Cポート正ビット線
BLC0B、BLC1B、BLCB Cポート反転ビット線
BLD0B、BLD1B Dポート反転ビット線
CC 列制御回路領域
CD 列デコーダ回路領域(または列デコーダ回路)
DL 正データ線
DLB 反転データ線
DN11、DN12、DN21、D22、DN31、D32 Nチャネル型ドライバ(Driver)MISFET
DSP デジタル信号処理回路領域
EM 埋め込みSRAM領域(または、SRAM回路)
HVth1、HVth2 高Vth領域
LR 論理回路領域
LVth1、LVth2 低Vth領域
M1 第1層埋め込み配線
M2 第2層埋め込み配線
M3 第3層埋め込み配線
MA メモリアレー領域(メモリセル配置領域)
MC、MC1、MC2、MC3 メモリセル領域(メモリセル)
MS2 第2層配線メタルスペーサ
P11、P12、P21、P22、P31、P32 Pチャネル型プルアップ(Pull Up)MISFET
PA Aポート
PB Bポート
PC Cポート
PR メモリ周辺回路領域
RB データ出力制御回路
RC 行制御回路
RS 読み出しデータ(読み出し信号)
SAL ラッチ型センスアンプ(センスアンプ)
SAS シングルエンド型センスアンプ
SL 長方形メモリセル領域の長辺
SN 正記憶ノード
SNB 反転記憶ノード
SP メモリセル領域のデータ記憶部
SS 長方形メモリセル領域の短辺
TW21、TW22、TW23 第2層スルー(Through)配線
Vdd 電源配線、電源又は電源電位
Vss 接地配線、接地又は接地電位
WB データ入力制御回路
WD 書き込み駆動回路
WL ワード線(Wordline)
WLA1、WLA2、WLA3 Aポートワード(Port Word)線
WLB1、WLB2 Bポートワード線
WLC1、WLC2 Cポートワード線
WLD1、WLD2 Dポートワード線
WS 入力データ
Claims (20)
- 以下を含む半導体集積回路装置:
(a)第1の主面を有する半導体基板;
(b)前記半導体基板の前記第1の主面側に設けられた埋め込みSRAM領域;
(c)前記SRAM領域内に設けられたメモリセル配置領域;
(d)前記メモリセル配置領域内にマトリクス状に設けられた多数のメモリセル領域、
ここで、各メモリセル領域は、平面的に見て長辺および短辺を有する長方形形状を有し、以下を含む:
(d1)前記長辺に関して、中央部に設けられた第1導電型を有する第1のウエル領域;
(d2)前記長辺に関して、前記第1のウエル領域の両側に設けられた第2導電型を有する第2のウエル領域および第3のウエル領域;
(d3)前記長辺と直交する方向に延在し、相互に相補的な対を成す第1のビット線および第2のビット線;
(d4)前記長辺と直交する方向に延在し、相互に相補的な対を成す第3のビット線および第4のビット線;
(d5)前記長辺と直交する方向に延在し、相互に相補的な対を成す第5のビット線および第6のビット線。 - 請求項1に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d6)データ記憶部;
(d7)前記データ記憶部に設けられた第1の記憶ノード;
(d8)前記データ記憶部に設けられ、前記第1の記憶ノードと相補的な第2の記憶ノード;
(d9)前記データ記憶部であって、前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のドライバMISFET;
(d10)前記データ記憶部であって、前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のドライバMISFET;
(d11)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第1のビット線に接続された第1のアクセスMISFET;
(d12)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第2のビット線に接続された第2のアクセスMISFET;
(d13)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第3のビット線に接続された第3のアクセスMISFET;
(d14)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第4のビット線に接続された第4のアクセスMISFET;
(d15)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第5のビット線に接続された第5のアクセスMISFET;
(d16)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第6のビット線に接続された第6のアクセスMISFET。 - 請求項2に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d17)前記第1のドライバMISFETおよび前記第1のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第1のアクティブ領域;
(d18)前記第3のアクセスMISFETおよび前記第5のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第2のアクティブ領域;
(d19)前記第2のドライバMISFETおよび前記第2のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第3のアクティブ領域;
(d20)前記第4のアクセスMISFETおよび前記第6のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第4のアクティブ領域。 - 請求項3に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d21)前記第1のアクティブ領域と前記第2のアクティブ領域の不純物領域を相互に連結する第1のローカルインタコネクト;
(d22)前記第3のアクティブ領域と前記第4のアクティブ領域の不純物領域を相互に連結する第2のローカルインタコネクト。 - 請求項4に記載の半導体集積回路装置において、前記第1のアクティブ領域の幅は、前記第2のアクティブ領域の幅よりも広く、前記第3のアクティブ領域の幅は、前記第4のアクティブ領域の幅よりも広い。
- 請求項2に記載の半導体集積回路装置において、前記第1のドライバMISFET、前記第2のドライバMISFET、前記第1のアクセスMISFETおよび前記第2のアクセスMISFETは、前記第3のアクセスMISFET、前記第4のアクセスMISFET、前記第5のアクセスMISFETおよび前記第6のアクセスMISFETよりも閾値電圧が高い。
- 請求項2に記載の半導体集積回路装置において、前記第3のアクセスMISFETと前記第5のアクセスMISFETの前記短辺に沿った方向の平面的位置関係と、前記第4のアクセスMISFETと前記第6のアクセスMISFETの前記短辺に沿った方向の平面的位置関係は、相互に反転している。
- 請求項4に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d23)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のプルアップMISFET;
(d24)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のプルアップMISFET;
(d25)前記第1のプルアップMISFETおよび前記第2のプルアップMISFETの他方の端子に接続され、前記長辺と直交する方向に延在し、第1層埋め込み配線から構成された電源供給配線。 - 請求項2に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d23)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のプルアップMISFET;
(d24)前記データ記憶部であって、前記第1のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のプルアップMISFET、
ここで、各メモリセル領域を構成する全てのMISFETは、Fin型FETで構成されている。 - 請求項9に記載の半導体集積回路装置において、前記第1のアクセスMISFETおよび前記第2のアクセスMISFETは、Fin型並列FETで構成されている。
- 請求項9に記載の半導体集積回路装置において、前記第1のドライバMISFETおよび前記第2のドライバMISFETおよび前記第1のアクセスMISFETおよび前記第2のアクセスMISFETは、Fin型並列FETで構成されている。
- 請求項2に記載の半導体集積回路装置において:
(x1)各メモリセル領域の前記第3のビット線および前記第4のビット線と、前記長辺と直交する方向において、このメモリセル領域に隣接するメモリセル領域の前記第3のビット線および前記第4のビット線は、異なるものであり;
(x2)各メモリセル領域の前記第5のビット線および前記第6のビット線と、前記長辺と直交する方向において、このメモリセル領域に隣接するメモリセル領域の前記第5のビット線および前記第6のビット線は、異なるものである。 - 請求項12に記載の半導体集積回路装置において、各メモリセル領域または、その上下に隣接するいずれかのメモリセル領域は、更に以下を有する:
(d26)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、当該メモリセル領域の前記第1のアクセスMISFETおよび前記第2のアクセスMISFETを制御する第1のワード線;
(d27)当該メモリセル領域の上下方向に隣接するメモリセル領域内に於いて前記長辺と平行な方向に延在し、この隣接メモリセル領域および当該メモリセル領域の前記第3のアクセスMISFETおよび前記第4のアクセスMISFETを制御する第2のワード線;
(d28)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、当該メモリセル領域および当該メモリセル領域の上下方向に隣接するメモリセル領域の前記第5のアクセスMISFETおよび前記第6のアクセスMISFETを制御する第3のワード線。 - 請求項3に記載の半導体集積回路装置において、前記第1のアクティブ領域、前記第2のアクティブ領域、前記第3のアクティブ領域および前記第4のアクティブ領域の幅は、等しい。
- 以下を含む半導体集積回路装置:
(a)第1の主面を有する半導体基板;
(b)前記半導体基板の前記第1の主面側に設けられた埋め込みSRAM領域;
(c)前記SRAM領域内に設けられたメモリセル配置領域;
(d)前記メモリセル配置領域内にマトリクス状に設けられた多数のメモリセル領域、
ここで、各メモリセル領域は、平面的に見て長辺および短辺を有する長方形形状を有し、以下を含む:
(d1)前記長辺に関して、中央部に設けられた第1のウエル領域;
(d2)前記長辺に関して、前記第1のウエル領域の両側に設けられた第2のウエル領域および第3のウエル領域;
(d3)前記長辺と直交する方向に延在し、相互に相補的な対を成す第1のビット線および第2のビット線;
(d4)前記長辺と直交する方向に延在し、相互に相補的な対を成す第3のビット線および第4のビット線;
(d5)前記長辺と直交する方向に延在し、相互に相補的な対を成さない第5のビット線および第6のビット線。 - 請求項15に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d6)データ記憶部;
(d7)前記データ記憶部に設けられた第1の記憶ノード;
(d8)前記データ記憶部に設けられ、前記第1の記憶ノードと相補的な第2の記憶ノード;
(d9)前記データ記憶部であって、前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続された第1のドライバMISFET;
(d10)前記データ記憶部であって、前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続された第2のドライバMISFET;
(d11)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第1のビット線に接続された第1のアクセスMISFET;
(d12)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第2のビット線に接続された第2のアクセスMISFET;
(d13)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第3のビット線に接続された第3のアクセスMISFET;
(d14)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第4のビット線に接続された第4のアクセスMISFET;
(d15)前記第2のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第1の記憶ノードに接続され、他方が前記第5のビット線に接続された第5のアクセスMISFET;
(d16)前記第3のウエル領域に設けられ、そのソースドレイン端子の一方が、前記第2の記憶ノードに接続され、他方が前記第6のビット線に接続された第6のアクセスMISFET。 - 請求項16に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d17)前記第1のドライバMISFETおよび前記第1のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第1のアクティブ領域;
(d18)前記第3のアクセスMISFETおよび前記第5のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第2のアクティブ領域;
(d19)前記第2のドライバMISFETおよび前記第2のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第3のアクティブ領域;
(d20)前記第4のアクセスMISFETおよび前記第6のアクセスMISFETが形成され、その長手方向が前記長辺と直交する方向に、前記第2のウエル領域内に延在する長方形形状を有する第4のアクティブ領域。 - 請求項17に記載の半導体集積回路装置において、各メモリセル領域は、更に以下を有する:
(d21)前記第1のアクティブ領域と前記第2のアクティブ領域の不純物領域を相互に連結する第1のローカルインタコネクト;
(d22)前記第3のアクティブ領域と前記第4のアクティブ領域の不純物領域を相互に連結する第2のローカルインタコネクト。 - 請求項18に記載の半導体集積回路装置において、前記第1のアクティブ領域の幅は、前記第2のアクティブ領域の幅よりも広く、前記第3のアクティブ領域の幅は、前記第4のアクティブ領域の幅よりも広い。
- 請求項16に記載の半導体集積回路装置において、各メモリセル領域または、その上下に隣接するいずれかのメモリセル領域は、更に以下を有する:
(d23)当該メモリセル領域内において前記長辺と平行な方向に延在し、当該メモリセル領域の前記第1のアクセスMISFETおよび前記第2のアクセスMISFETを制御する第1のワード線;
(d24)当該メモリセル領域と上下方向に隣接するメモリセル領域の境界領域又はその近傍に於いて前記長辺と平行な方向に延在し、これらのメモリセル領域の前記第3のアクセスMISFETおよび前記第4のアクセスMISFETを制御する第2のワード線;
(d25)当該メモリセル領域内に於いて前記長辺と平行な方向に延在し、このメモリセル領域と上下方向に隣接するメモリセル領域の前記第5のアクセスMISFETを制御する第3のワード線;
(d26)当該メモリセル領域と上下方向に隣接するメモリセル領域内において前記長辺と平行な方向に延在し、これらのメモリセル領域の前記第6のアクセスMISFETを制御する第4のワード線。
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2013/071213 WO2015019411A1 (ja) | 2013-08-06 | 2013-08-06 | 半導体集積回路装置 |
| US14/909,135 US9515076B2 (en) | 2013-08-06 | 2013-08-06 | Semiconductor integrated circuit device |
| CN201380078485.XA CN105408960B (zh) | 2013-08-06 | 2013-08-06 | 半导体集成电路器件 |
| KR1020167003454A KR20160040577A (ko) | 2013-08-06 | 2013-08-06 | 반도체 집적 회로 장치 |
| EP13891121.9A EP3032540B1 (en) | 2013-08-06 | 2013-08-06 | Semiconductor integrated circuit device |
| JP2015530577A JPWO2015019411A1 (ja) | 2013-08-06 | 2013-08-06 | 半導体集積回路装置 |
| TW103118160A TWI647811B (zh) | 2013-08-06 | 2014-05-23 | Semiconductor integrated circuit device |
| US15/338,390 US9711512B2 (en) | 2013-08-06 | 2016-10-30 | Semiconductor integrated circuit device |
| US15/635,970 US9972629B2 (en) | 2013-08-06 | 2017-06-28 | Semiconductor integrated circuit device |
| US15/960,492 US20180240801A1 (en) | 2013-08-06 | 2018-04-23 | Semiconductor integrated circuit device |
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| US (4) | US9515076B2 (ja) |
| EP (1) | EP3032540B1 (ja) |
| JP (1) | JPWO2015019411A1 (ja) |
| KR (1) | KR20160040577A (ja) |
| CN (1) | CN105408960B (ja) |
| TW (1) | TWI647811B (ja) |
| WO (1) | WO2015019411A1 (ja) |
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| US9972629B2 (en) * | 2013-08-06 | 2018-05-15 | Renesas Electronics Corporation | Semiconductor integrated circuit device |
| US10177133B2 (en) | 2014-05-16 | 2019-01-08 | Taiwan Semiconductor Manufacturing Co., Ltd. | Semiconductor device including source/drain contact having height below gate stack |
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| WO2016151866A1 (ja) * | 2015-03-26 | 2016-09-29 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
| US10811405B2 (en) | 2015-03-26 | 2020-10-20 | Renesas Electronics Corporation | Semiconductor device |
| JPWO2016151866A1 (ja) * | 2015-03-26 | 2017-06-08 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
| CN106716625A (zh) * | 2015-03-26 | 2017-05-24 | 瑞萨电子株式会社 | 半导体器件 |
| KR20170131186A (ko) * | 2016-05-19 | 2017-11-29 | 타이완 세미콘덕터 매뉴팩쳐링 컴퍼니 리미티드 | 반도체 디바이스용 구조 및 방법 |
| DE102016114779B4 (de) * | 2016-05-19 | 2025-08-07 | Taiwan Semiconductor Manufacturing Company, Ltd. | Halbleiterstruktur und verfahren zu ihrer herstellung |
| JP2018129551A (ja) * | 2018-05-17 | 2018-08-16 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
| TWI882479B (zh) * | 2023-01-27 | 2025-05-01 | 台灣積體電路製造股份有限公司 | 記憶體單元、記憶體單元陣列以及製造積體電路的方法 |
| US12334178B2 (en) | 2023-01-27 | 2025-06-17 | Taiwan Semiconductor Manufacturing Company, Ltd. | Integrated circuit, system and method of forming the same |
Also Published As
| Publication number | Publication date |
|---|---|
| US9972629B2 (en) | 2018-05-15 |
| US9711512B2 (en) | 2017-07-18 |
| TW201507101A (zh) | 2015-02-16 |
| US20170047332A1 (en) | 2017-02-16 |
| JPWO2015019411A1 (ja) | 2017-03-02 |
| US20170301678A1 (en) | 2017-10-19 |
| CN105408960B (zh) | 2019-02-15 |
| US9515076B2 (en) | 2016-12-06 |
| EP3032540B1 (en) | 2025-12-03 |
| US20160181255A1 (en) | 2016-06-23 |
| EP3032540A1 (en) | 2016-06-15 |
| US20180240801A1 (en) | 2018-08-23 |
| EP3032540A4 (en) | 2017-03-15 |
| TWI647811B (zh) | 2019-01-11 |
| KR20160040577A (ko) | 2016-04-14 |
| CN105408960A (zh) | 2016-03-16 |
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