Sectorized electrically erasable and programmable non-volatile m

Details Sectorized electrically erasable and programmable non-volatile m Sectorized electrically erasable and programmable non-volatile m

1997-03-21

1998-12-29

Fears, Terrell W.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

365 45, G11C 1500, G11C 1300

Patent

active

058547649

ABSTRACT:
A sectorized electrically erasable and programmable non-volatile memory device comprises: a plurality of individually-addressable memory sectors, each memory sector comprising an array of memory cells arranged in rows and columns; redundancy columns of redundancy memory cells for replacing defective columns of memory cells; and a redundancy control circuit for storing addresses of the defective columns and activating respective redundancy columns when said defective columns are addressed. Each memory sector comprises at least one respective redundancy column. The redundancy control circuit comprises at least one memory means comprising individually addressable memory locations each one associated with a respective memory sector for storing, individually for each memory sector, addresses of a defective column belonging to the memory sector, and an address recognition means associated with said memory means for recognizing if a current address supplied to the memory device coincides with a defective column address stored in an addressed one of said memory locations associated with a currently addressed memory sector.

REFERENCES:
patent: 5347484 (1994-09-01), Kwong et al.
patent: 5667883 (1997-10-01), Miwa

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