Protection device in an integrated circuit

Details Protection device in an integrated circuit Protection device in an integrated circuit

1985-07-30

1987-12-01

James, Andrew J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

357 59, 357 51, 361 56, 361 91, H01L 2978

Patent

active

047107910

ABSTRACT:
An I/O protection device which protects the IC from noise especially from static charge break down is disclosed. A resistance body made from polysilicon is provided between the I/O pad and I/O circuit of the IC. The resistance body may be formed over the gate oxide or field oxide layer. Beneath the resistance body is formed a diffusion region having an opposite conductivity type to that of the substrate. The diffusion region is connected electrically in parallel to the resistance body. In some cases, the diffusion region may be connected at only one point.

REFERENCES:
patent: 4133000 (1979-01-01), Greenstein
patent: 4167804 (1979-09-01), Greenstein
patent: 4189739 (1980-02-01), Copeland
patent: 4609935 (1986-09-01), Kondo
Patent Abstracts of Japan, vol. 8, No. 221, Oct. 1984, Abstract of Miyagawa Patent Publications 59-104171, 6/15/84.

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