Integrated circuit memory with column redundancy having shared r

Details Integrated circuit memory with column redundancy having shared r Integrated circuit memory with column redundancy having shared r

1995-04-24

1996-03-26

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Bad bit

365177, 3652256, G11C 700

Patent

active

055026761

ABSTRACT:
An integrated circuit memory (30) having redundancy shares read, global data lines shared between a regular memory array (35) and a plurality of redundant columns (41). Redundant data and regular data are multiplexed onto the read global data lines by emitter summing bipolar transistors of regular sense amplifiers (46) with a redundant multiplexer (83). When a redundant column is used to replace a defective regular column, a match circuit (88) generates a match signal for selecting a redundant multiplexer circuit (84, 85, or 86) and for deselecting a corresponding regular sense amplifier (46). The match circuit (88) includes emitter summing circuits (230, 240) to rapidly generate the match signal.

REFERENCES:
patent: 4837747 (1989-06-01), Dosaka
patent: 4881200 (1989-11-01), Urai
patent: 5163023 (1992-11-01), Ferris
patent: 5293348 (1994-03-01), Abe

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