Protection circuit associated with input terminal of semiconduct

Details Protection circuit associated with input terminal of semiconduct Protection circuit associated with input terminal of semiconduct

1989-12-27

1992-01-14

James, Andrew J.

357 13, 357 41, 357 51, H01L 2906, H01L 2978, H01L 2990, H01L 2902

Patent

active

050815148

ABSTRACT:
A semiconductor device fabricated on an n-type substrate has a plurality of signal input terminals each associated with a protection circuit for preventing an internal integrated circuit from being damaged by an undesirable surge voltage. The protection circuit is formed in a p-type well and comprises an n-type impurity region supplied with the surge voltage, an inner well contact area located inside of the n-type impurity region and an outer well contact area located outside of the n-type impurity region, so that a large amount of current flows from both side surfaces of the n-type impurity region into the inner and outer well contact areas, thereby decreasing the voltage level in the p-type well for preventing the p-n junction between the well and the substrate from destruction.

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patent: 4438449 (1984-03-01), Usuda
patent: 4727408 (1988-02-01), Hatakeyama
patent: 4821089 (1989-04-01), Strauss
patent: 4862229 (1989-08-01), Mundy et al.
patent: 4881113 (1989-11-01), Momodomi et al.
patent: 4922371 (1990-05-01), Grey et al.

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