Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1997-05-07

1998-07-14

Yoo, Do Hyun

Static information storage and retrieval

Read/write circuit

Bad bit

365201, G11C 700

Patent

active

057814848

ABSTRACT:
Normal column selection signal switching device (20) is provided to switch a signal outputted from normal column selection signal generating device (19) in response to a test-mode signal (TMC1). Even if the normal column selection signal generating device (19) outputs a signal to disable a normal column decoder (3), the normal column selection signal switching device (20) switches the signal to enable the normal column decoder (3) to operate in the test operation. Having this configuration, a semiconductor memory device enables writing of data into all the normal memory cells even after some of the normal memory cells are replaced by spare memory cells.

REFERENCES:
patent: 5416740 (1995-05-01), Fujita et al.
patent: 5566128 (1996-10-01), Magome
patent: 5596536 (1997-01-01), Koh
patent: 5617364 (1997-04-01), Hatakeyama

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