ESD protection circuit that can tolerate a negative input...

Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means

Reexamination Certificate

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C257S355000

Reexamination Certificate

active

07038898

ABSTRACT:
An electrostatic discharge (ESD) protection circuit includes a diode that is connected between a pad and a power supply line, and a negative protection circuit that is connected between the pad and a ground line. The negative protection circuit allows the pad voltage to go below ground during normal (non-ESD) operation, and provides adequate ESD protection during an ESD event.

REFERENCES:
patent: 6108181 (2000-08-01), Gerosa
patent: 6163199 (2000-12-01), Miske et al.
Ker et al., “ESD Protection for IC with Power-down-mode Operation”, May 2004, Proceedings of the 2004 International Symposium on Circuits and Systems ISCAS, vol. 2, pp. 717-720.

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