Semiconductor memory device with built-in accessing system for r

Details Semiconductor memory device with built-in accessing system for r Semiconductor memory device with built-in accessing system for r

1994-10-05

1996-07-09

Yoo, Do Hyun

Static information storage and retrieval

Read/write circuit

Bad bit

36518907, 365195, 365201, 36523003, G11C 700, G11C 2900

Patent

active

055351611

ABSTRACT:
A semiconductor memory device replaces defective regular memory cells with redundant memory cells upon discrimination of an access to the defective regular memory cells. A redundant data accessing unit controls sense amplifiers to produce an information signal indicative of the address of the defective regular memory cell. A redundancy circuit for storing the address allows an output circuit to output the information signal when external address bits are indicative of the address of the defective regular memory cell, thereby making the circuit arrangement simple.

REFERENCES:
patent: 5383156 (1995-01-01), Komatsu
patent: 5392247 (1995-02-01), Fujita
patent: 5424989 (1995-06-01), Hagiwara et al.

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