Integrated circuit with an improved input protective device

Details Integrated circuit with an improved input protective device Integrated circuit with an improved input protective device

1985-05-22

1988-04-19

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 357 2313, H02H 320

Patent

active

047394382

ABSTRACT:
The invention relates to an improved protective transistor arrangement for MIS circuits and the like which is capable of stable operation without breakdown in the event of a surge voltage. The protective transistor has a channel region whose length varies along the width of the channel such that the channel length at the central portion of the channel region is made less than the channel length at the sides of the channel region. By way of this construction, the current path through the protective transistor is largely confined to the central area of the channel region, preventing current from being concentrated at side portions of the channel region adjacent the field oxide surrounding the transistor.

REFERENCES:
patent: 3777216 (1973-12-01), Armstrong
patent: 3819952 (1974-06-01), Enomoto et al.
patent: 3967295 (1976-06-01), Stewart
patent: 4423431 (1983-12-01), Sasaki

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