Semiconductor memory device with reduced chip area and...

Details Semiconductor memory device with reduced chip area and... Semiconductor memory device with reduced chip area and...

2005-09-13

2005-09-13

Nguyen, Van Thu (Department: 2824)

Static information storage and retrieval

Addressing

Plural blocks or banks

C365S200000, C365S203000

Reexamination Certificate

active

06944085

ABSTRACT:
A redundancy circuit embedded in the semiconductor memory device includes a sector selector and a bit line selector. The bit line selector repairs defective bit lines and the sector selector repairs defective global bit lines and selectively repairs defective bit lines. The sector selector includes a fixed address cell storage box for storing addresses of the defective bit lines and a flexible address cell storage box for storing addresses of the defective global bit lines. The circuit area is minimized since the coding unit corresponding to a sector address is not included in the bit line selector. The repair rate of defective bit lines is improved since the sector selector operates selectively as the bit line selector.

REFERENCES:
patent: 5596536 (1997-01-01), Koh
patent: 6154389 (2000-11-01), Chung et al.

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