Overvoltage protected integrated circuit

Details Overvoltage protected integrated circuit Overvoltage protected integrated circuit

1988-03-02

1989-07-11

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, 361119, 357 13, 379412, H02H 320

Patent

active

048477249

ABSTRACT:
The circuit relates to the protection of some integrated circuits connected with transmission lines and therefore liable to be subject to overvoltages. The protection comprises diodes (D1, D2, D3). Those diodes switch towards an internal supply conductor (CA) either the external supply voltage VBAT, or the overvoltage possibly present on an output terminal (A) if said overvoltage is higher than the internal supply voltage. The diodes have a special structure, that is they are formed from junctions between regions electrically insulated from the epitaxial substrate on which the integrated circuit is formed. The invention applies in particular to subscriber line interface circuits.

REFERENCES:
patent: 3858062 (1975-01-01), Davis
patent: 3911296 (1975-10-01), Davis
patent: 4005342 (1977-02-01), Davis
patent: 4024417 (1977-05-01), Heuber et al.
patent: 4661979 (1987-04-01), Jakab

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