Identification of repaired integrated circuits

Details Identification of repaired integrated circuits Identification of repaired integrated circuits

H - Electricity

01

L

356/117, 356/66

H01L 21/66 (2006.01) G11C 29/00 (2006.01) H01L 23/525 (2006.01) H01L 23/544 (2006.01)

Patent

CA 1188426

INDENTIFICATION OF REPAIRED INTEGRATED CIRCUITS Abstract of the Disclosure 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 con nected between a TTL pin 10 of the integrated circuit and a fuse F1. The fuse F1 is also connected to a potential source VCC. 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.

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