Semiconductor memory device and defective memory cell repair cir

Details Semiconductor memory device and defective memory cell repair cir Semiconductor memory device and defective memory cell repair cir

1993-07-12

1995-06-06

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Bad bit

3652257, 36523006, 36523002, 326 13, 327526, G11C 1140

Patent

active

054228506

ABSTRACT:
To provide a type of semiconductor memory device characterized by the fact that the redundancy for the defective memory of defective bits is increased and the area occupied by the redundant memory address decoder on the chip is minimized, thereby reducing the cost of the semiconductor memory device. It has multiple fuse decoders which are commonly connected to the address bus and are programmed for the different addresses, and it has a redundant address decoder which detects coincidence/uncoincidence between the outputs of the two decoders and generates a redundant address coincidence signal, so as to increase the efficiency in repairing the defective memory.

REFERENCES:
patent: 4773046 (1988-09-01), Akaogi et al.
patent: 5262994 (1993-11-01), McClure

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