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GB1300301A - Read-only memories - Google Patents

Read-only memories

Info

Publication number
GB1300301A
GB1300301A GB08847/70A GB1884770A GB1300301A GB 1300301 A GB1300301 A GB 1300301A GB 08847/70 A GB08847/70 A GB 08847/70A GB 1884770 A GB1884770 A GB 1884770A GB 1300301 A GB1300301 A GB 1300301A
Authority
GB
United Kingdom
Prior art keywords
strips
strip
read
conductor
deposited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB08847/70A
Inventor
David Chester Campbell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEN INSTR MICROELECT
Original Assignee
GEN INSTR MICROELECT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GEN INSTR MICROELECT filed Critical GEN INSTR MICROELECT
Priority to GB08847/70A priority Critical patent/GB1300301A/en
Publication of GB1300301A publication Critical patent/GB1300301A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/08—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements
    • G11C17/10—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements in which contents are determined during manufacturing by a predetermined arrangement of coupling elements, e.g. mask-programmable ROM
    • G11C17/12—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using semiconductor devices, e.g. bipolar elements in which contents are determined during manufacturing by a predetermined arrangement of coupling elements, e.g. mask-programmable ROM using field-effect devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10B—ELECTRONIC MEMORY DEVICES
    • H10B20/00—Read-only memory [ROM] devices
    • H10W20/20—

Landscapes

  • Semiconductor Memories (AREA)

Abstract

1300301 Read only memory GENERAL INSTRUMENT MICROELECTRONICS Ltd 20 July 1971 [20 April 1970] 18847/70 Heading G4A A read only memory has a semi-conductor substrate of N-type material having diffused regions forming strips of P-type conductivity. The strips are arranged in groups 1, 2, each of which has two sensing or read-out strips 3, 4 a read strip 5 and an output strip 7, strips 5 of a set of groups being coupled by a diffused strip 7 and strips 6 by a diffused strip 8. The strips and substrate are covered by an insulating material on which electrodes 11, 12 are deposited to overlie the substrate between strips 3 or 4 and 5 or 3 or 4 and 6. Electrodes 13, 14 are also deposited to overlie strips 7, 9, and strips 8, 10, The electrodes form insulated field effect devices with their strips and regions. A further insulating material is applied and conductors X, Y, # 1 , # 2 are deposited. In operation if a bit location associated with an X conductor is to be read a negative going pulse is applied from circuit 19 in phase # 1 time to the appropriate conductor. At each electrode 11 connected to the conductor the voltage on read strip 5 from transistor 7, 9, 13 negatively charges the associated sensing strip 3 or 4. An appropriate Y strip is fed with a negative pulse to transfer any charge from strip 3 or 4 to strip 6 to be read at output 17. A # 2 pulse connects strips 6 to earth to discharge any potential existing.
GB08847/70A 1970-04-20 1970-04-20 Read-only memories Expired GB1300301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08847/70A GB1300301A (en) 1970-04-20 1970-04-20 Read-only memories

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08847/70A GB1300301A (en) 1970-04-20 1970-04-20 Read-only memories

Publications (1)

Publication Number Publication Date
GB1300301A true GB1300301A (en) 1972-12-20

Family

ID=10119428

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08847/70A Expired GB1300301A (en) 1970-04-20 1970-04-20 Read-only memories

Country Status (1)

Country Link
GB (1) GB1300301A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296967A1 (en) * 1974-12-30 1976-07-30 Ibm LARGE DENSITY LOGICAL NETWORK
EP0001164A1 (en) * 1977-08-31 1979-03-21 Western Electric Company, Incorporated Integrated read-only memory
AT391586B (en) * 1988-08-12 1990-10-25 Erstes Wiener Reinigungsinstit Trap for small animals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296967A1 (en) * 1974-12-30 1976-07-30 Ibm LARGE DENSITY LOGICAL NETWORK
EP0001164A1 (en) * 1977-08-31 1979-03-21 Western Electric Company, Incorporated Integrated read-only memory
AT391586B (en) * 1988-08-12 1990-10-25 Erstes Wiener Reinigungsinstit Trap for small animals

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees