Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Fusible link or intentional destruct circuit
Patent
1997-09-29
2000-01-11
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Fusible link or intentional destruct circuit
361 56, 3652257, G11C 700
Patent
active
060140526
ABSTRACT:
In providing security for data within an integrated circuit, a plurality of fusible links are connected in series between a programming input/output pad and the integrated circuit into which protected data is written. The links are provided with separate input/output pads for individually blowing each link. Blowing any fusible link in the series prevents the programming input/output pad from being employed to alter or copy secured data within the integrated circuit. The failure rate of the security feature thus becomes a product of the fallout rates for each individual link, greatly reducing the overall failure rate.
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Adolphe Eunja
Cunningham Terry D.
LSI Logic Corporation
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