JPS57191896A - Semiconductor integrated circuit - Google Patents

Semiconductor integrated circuit

Info

Publication number
JPS57191896A
JPS57191896A JP7742781A JP7742781A JPS57191896A JP S57191896 A JPS57191896 A JP S57191896A JP 7742781 A JP7742781 A JP 7742781A JP 7742781 A JP7742781 A JP 7742781A JP S57191896 A JPS57191896 A JP S57191896A
Authority
JP
Japan
Prior art keywords
current
discrimination
current value
trs
constitution
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.)
Pending
Application number
JP7742781A
Other languages
Japanese (ja)
Inventor
Koichi Hanamura
Hiroshi Miyajima
Kingo Wakimoto
Toshio Ichiyama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7742781A priority Critical patent/JPS57191896A/en
Publication of JPS57191896A publication Critical patent/JPS57191896A/en
Pending 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

Landscapes

  • Read Only Memory (AREA)
  • Semiconductor Memories (AREA)

Abstract

PURPOSE:To discriminate contents of an ROM electrically to automatize the wafer test, by incorporating a discriminating circuit consisting of transsitors TRs which can flow a reference current and a discrimination current respectively. CONSTITUTION:A discriminating circuit consists of a dipletion TR7 for flowing a reference current and depletion TRs 8-10 for flowing a current corresponding to the discrimination code. In this constitution, a constant voltage is applied across measuring terminals 5 and 11, and the current value is measured. The same voltage is applied across measuring terminals 6 and 11, and the current value is measured. If the connection is so determined that the value obtained by dividing the latter current value by the former current value corresponds to the discrimination number indicating contents of a mask ROM, the discrimination is possible by these measurements.
JP7742781A 1981-05-21 1981-05-21 Semiconductor integrated circuit Pending JPS57191896A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7742781A JPS57191896A (en) 1981-05-21 1981-05-21 Semiconductor integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7742781A JPS57191896A (en) 1981-05-21 1981-05-21 Semiconductor integrated circuit

Publications (1)

Publication Number Publication Date
JPS57191896A true JPS57191896A (en) 1982-11-25

Family

ID=13633682

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7742781A Pending JPS57191896A (en) 1981-05-21 1981-05-21 Semiconductor integrated circuit

Country Status (1)

Country Link
JP (1) JPS57191896A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428088A (en) * 1990-05-23 1992-01-30 Samsung Electron Co Ltd Semiconductor ic chip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0428088A (en) * 1990-05-23 1992-01-30 Samsung Electron Co Ltd Semiconductor ic chip

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