Identification of repaired integrated circuits

Details Identification of repaired integrated circuits Identification of repaired integrated circuits

1982-03-19

1984-10-30

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

3072021, 365 96, 365200, H03K 1940, H02H 720

Patent

active

044801998

ABSTRACT:
A circuit for providing an identification signal indicative of whether or not an integrated circuit has been repaired includes a circuit which operates at potentials outside the normal range of the integrated circuit. The circuit includes at least one transistor T1 serially connected between a TTL pin 10 of the integrated circuit and a fuse F1. The fuse F1 is also connected to a potential source V.sub.CC. If the integrated circuit is repaired the fuse F1 is opened, and consequently, application of a potential outside the normal range will cause current to flow if fuse F1 has not been opened, and cause no current to flow if fuse F1 has been opened.

REFERENCES:
patent: 3335403 (1967-08-01), Mann et al.
patent: 3930304 (1976-01-01), Keller et al.
patent: 4064493 (1977-12-01), Davis et al.
patent: 4104546 (1978-08-01), Seiler
patent: 4406997 (1983-09-01), Depp et al.

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