Redundancy concept for memory circuits having ROM memory cells

Details Redundancy concept for memory circuits having ROM memory cells Redundancy concept for memory circuits having ROM memory cells

1998-12-03

1999-11-16

Dinh, Son T.

Static information storage and retrieval

Read/write circuit

Bad bit

371 101, G11C 700

Patent

active

059869526

ABSTRACT:
Addressable first units having ROM memory cells, for example word or bit lines, can be replaced by redundant second units having RAM memory cells. This has the advantage that the RAM memory cells can be realized with a smaller area than alternative PROM memory cells. The invention can be applied particularly advantageously to DROM memories.

REFERENCES:
patent: 4601031 (1986-07-01), Walker et al.
patent: 4782466 (1988-11-01), Yamaguchi et al.
patent: 5500821 (1996-03-01), Tanaka
patent: 5535162 (1996-07-01), Uenoyama
patent: 5644541 (1997-07-01), Siu et al.
patent: 5657280 (1997-08-01), Shin et al.

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