Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1995-03-09

1997-04-01

Nguyen, Tan T.

Static information storage and retrieval

Read/write circuit

Bad bit

36518509, G11C 2900

Patent

active

056173644

ABSTRACT:
A semiconductor memory device includes a memory cell array having memory cells connected to word lines and bit lines, a redundant memory cell array having either a row redundancy array which is commonly provided to the memory cells and has redundant word lines for saving faulty word lines, or a column redundancy array which is commonly provided to the memory cells and has redundant bit lines for saving faulty bit lines, and a redundancy saving circuit including either one or more row redundancy array saving bit lines for saving one or more bit-line faults occurring in the row redundancy array or one or more column redundancy array saving word lines for saving one or more word-line faults occurring in the column redundancy array.

REFERENCES:
patent: 4639897 (1987-01-01), Wacyk
patent: 5278839 (1994-01-01), Matsumoto et al.
patent: 5307316 (1994-04-01), Takemae

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