Programmable/reprogrammable fuse

Details Programmable/reprogrammable fuse Programmable/reprogrammable fuse

1998-06-02

1999-10-12

Nelms, David

Static information storage and retrieval

Read/write circuit

Having fuse element

365200, 365201, G11C 700

Patent

active

059663391

ABSTRACT:
A programmable/reprogrammable fuse arrangement that includes two fuse links provided each with an output port and an exclusive-or gate connected to the output port of each of the two fuses, wherein the fuse arrangement is reprogrammed by successively blowing both of the two fuse links is described. The programmable/reprogrammable fuse arrangement can be extended to a plurality of fuses and cascaded exclusive-ORs such that each fuse link provides one leg of the gate and the previous stage, the second. Thus, for N fuse links and N exclusive-ORs, the fuse arrangement thus formed can be reprogrammed a total of N times by sequentially blowing one fuse link at a time. The arrangement ceases to be reprogrammable once all the fuse links have been blown. The reprogrammable fuse arrangement is of particular importance for semiconductor memories and microprocessors, as for instance, for bringing in-line redundancy units attached to a fuse link.

REFERENCES:
patent: 4389715 (1983-06-01), Eaton, Jr. et al.
patent: 4747080 (1988-05-01), Yamada
patent: 5200652 (1993-04-01), Lee
patent: 5412593 (1995-05-01), Magel et al.
patent: 5432388 (1995-07-01), Crafts et al.
patent: 5555212 (1996-09-01), Toshiaki et al.
patent: 5642316 (1997-06-01), Tran et al.

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