Semiconductor memory device with redundancy responsive to advanc

Details Semiconductor memory device with redundancy responsive to advanc Semiconductor memory device with redundancy responsive to advanc

1989-11-27

1991-07-23

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Bad bit

3652257, 371 102, G11C 700

Patent

active

050349252

ABSTRACT:
A semiconductor memory device of the type having redundant memory cells is capable of replacing defective memory cells with the redundant memory cells for providing a rescue, and the redundant memory cells are activated upon an access to one of the defective memory cells, however, the semiconductor memory device according to the present invention is responsive to an external controlling signal for forcibly canceling the replacement, so that the defective memory cells are accessible for trouble shooting after the replacement.

REFERENCES:
patent: 4862416 (1989-08-01), Takeuchi

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