Semiconductor memory device having a redundancy circuit

Details Semiconductor memory device having a redundancy circuit Semiconductor memory device having a redundancy circuit

1998-02-23

1999-09-28

Phan, Trong

Static information storage and retrieval

Read/write circuit

Bad bit

3652257, 36523006, G11C 700, G11C 800

Patent

active

059599073

ABSTRACT:
A redundancy circuit for a semiconductor device comprises a circuit having variable impedance changed in accordance with a chip selecting signal. The variable impedance circuit has a low impedance when the chip selecting signal is at a low level and a high impedance when the chip selecting signal is at a high level. Therefore, when the device is in a standby state, no static current flows, and when the chip is in an active state current of less than several micro amperes flows. Thus, the power dissipation of the redundancy circuit can be reduced.

REFERENCES:
patent: 5373471 (1994-12-01), Saeki et al.
patent: 5469391 (1995-11-01), Haraguchi
patent: 5808948 (1998-09-01), Kim et al.

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