Redundancy circuit

Details Redundancy circuit Redundancy circuit

1995-07-24

1997-01-21

Nguyen, Tan T.

Static information storage and retrieval

Read/write circuit

Bad bit

36523003, 3652257, G11C 2900, G11C 700

Patent

active

055965369

ABSTRACT:
A redundancy circuit selectively drives two or more redundancy memory cell arrays to improve the integration of a highly integrated semiconductor memory device. To do this, the redundancy circuit has at least two memory blocks, each having a plurality of normal memory cell arrays and a redundancy memory cell array for replacing a defective memory cell array, at least two redundancy cell array drivers respectively connected to at least two redundancy memory cell arrays for driving at least two redundancy memory cell arrays, a defective-cell-array detection fuse box for detecting address corresponding to a defective memory cell array, and a driving controller for driving one of at least two redundancy cell array drivers by outputs of the defective-cell-array detection fuse box and the block selection fuse box.

REFERENCES:
patent: 4757474 (1988-07-01), Fukushi et al.
patent: 5046046 (1991-09-01), Sweha et al.
patent: 5060197 (1991-10-01), Park et al.
patent: 5083294 (1992-01-01), Okajima
patent: 5243570 (1993-09-01), Saruwatari
patent: 5293348 (1994-03-01), Abe
patent: 5307316 (1994-04-01), Takemae
patent: 5404331 (1995-04-01), McClure

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