Redundancy circuit having a spare memory block replacing defecti

Details Redundancy circuit having a spare memory block replacing defecti Redundancy circuit having a spare memory block replacing defecti

1991-03-22

1995-01-31

Lee, Benny

Static information storage and retrieval

Read/write circuit

Bad bit

365 96, 365210, G11C 700

Patent

active

053863860

ABSTRACT:
A semiconductor memory device having a redundancy circuit for remedying defective columns caused during manufacture, includes a plurality of spare memory cells for storing binary data, spare bit lines connected to the outputs of the spare memory cells, respectively, and each having two or more columns, a spare gate circuit for controlling the outputs of the spare bit lines, a circuit having storage sections for storing addresses of the defective columns, for generating a spare gate selection signal in response to one of the addresses of the defective columns and selecting a spare gate, and a circuit for prohibiting all the outputs from a column decoder in response to the spare gate selection signal. The defective columns are remedied in units of columns whose number is smaller than that of columns of the spare bit lines.

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