Protection circuit

Details Protection circuit Protection circuit

1975-11-28

1977-08-02

Heyman, John S.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307251, 307279, 307DIG1, 357 42, H01L 2978, H03K 1760, H03K 1730, H03K 3353

Patent

active

040398692

ABSTRACT:
A protection circuit for a monolithic integrated circuit in which regions of one conductivity type are formed in a common substrate of complementary conductivity type and in which a first voltage is applied to the substrate to prevent forward conduction through the junctions formed between the regions and the substrate. The protection network includes a control element, responsive to the first voltage, which is connected between a second voltage point and selected regions for coupling the voltage at the second point to the selected regions only in response to the presence of the first voltage. This prevents the junctions formed by the selected regions and the substrate from being forward biased and carrying excessive and/or destructive currents when the first voltage is absent.

REFERENCES:
patent: 3675144 (1972-07-01), Zuk
patent: 3676700 (1972-07-01), Buchanan
patent: 3754171 (1973-08-01), Anzai et al.
patent: 3801831 (1974-04-01), Dame
patent: 3866064 (1975-02-01), Gregory et al.
patent: 3916430 (1975-10-01), Heuner et al.

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