Device to detect the depassivation of an integrated circuit

Details Device to detect the depassivation of an integrated circuit Device to detect the depassivation of an integrated circuit

1987-06-29

1989-09-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 60CD, 324 61R, 357 52, G01R 2726

Patent

active

048684899

ABSTRACT:
The depassivation of an integrated circuit is detected by using the fact that the passivation coat which covers this circuit participates in the coupling capacitances that exist between parallel metallized lines made on its surface. The variation in one of these capacitances, resulting from depassivation, leads to a modification of the dielectrical induction of a voltage step, emitted on one line, in another line. The resulting variation in the induced voltage is used to produce a logic signal that reveals this depassivation. This logic signal can be used to neutralize the functioning of the integrating circuit to be protected.

REFERENCES:
patent: 3750018 (1973-07-01), Leone
patent: 3801900 (1974-04-01), Szasz
patent: 3986110 (1976-10-01), Overall
patent: 4423371 (1983-12-01), Senturia
patent: 4453126 (1984-06-01), Volgyesi
patent: 4510436 (1985-04-01), Raymond

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