Semiconductor memory device

Static information storage and retrieval – Read/write circuit – Bad bit

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Details

3652257, 365 96, 327525, 326 38, 326 39, 326 41, G11C 700

Patent

active

059075139

ABSTRACT:
A semiconductor memory device including redundancy decision circuitry having a block writing function is disclosed. The redundancy decision circuitry assigns a single fuse and a single transistor to each pair of upper and lower bits of a plurality of column addresses. Selectors each selects either one of particular upper and lower bits input thereto. The device therefore reduces the number of fuses corresponding to column mask signals to be used at the time of block writing, thereby reducing the area to be occupied by the redundancy decision circuitry.

REFERENCES:
patent: 5768198 (1998-06-01), Moroo

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