Memory circuit having a redundant memory cell array for replacin

Details Memory circuit having a redundant memory cell array for replacin Memory circuit having a redundant memory cell array for replacin

1990-05-25

1991-10-15

Clawson, Jr., Joseph E.

Static information storage and retrieval

Read only systems

Fusible

365104, 365200, 36523003, 3072021, 307441, 307449, 307468, 371 103, G11C 1716

Patent

active

050580590

ABSTRACT:
A memory circuit having a regular memory cell group, a redundant memory cell group, and an improved redundant decoder circuit for selecting the redundant memory cell group if there is any defect in the regular memory cell group. The redundant decoder circuit includes first and second programming circuits, and it is inoperative when the first programming circuit has not been programmed, operative when the first program element has been programmed and the second programming circuit has not been programmed, and inoperative when the second program circuit has been programmed.

REFERENCES:
patent: 4538245 (1985-08-01), Smarandoiu et al.
patent: 4590388 (1986-05-01), Clemons et al.
patent: 4630241 (1986-12-01), Kobayashi et al.
patent: 4633429 (1986-12-01), Lewandowski et al.
patent: 4860256 (1989-08-01), Devin et al.

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