Transient resistant key operated pulse generating calling device

Details Transient resistant key operated pulse generating calling device Transient resistant key operated pulse generating calling device

1983-12-05

1985-11-26

Brown, Thomas W.

179 90BD, 179 90K, 179 81R, H04M 131, H04M 1274

Patent

active

045555974

ABSTRACT:
A protective circuit consisting of two diodes which functions along with other external circuit elements to provide protection against transients for an integrated circuit utilized to generate dial pulses in an electronic telephone circuit. By means of included diodes, excessive transients are prevented from entering the integrated circuit internal circuitry and disturbing the memory included therein or other operational characteristics.

REFERENCES:
patent: 4209668 (1980-06-01), Weinberger et al.
patent: 4223186 (1980-09-01), Hartmann
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4267409 (1981-05-01), Baldoni
patent: 4329546 (1982-05-01), Montesi et al.
patent: 4388499 (1983-06-01), Janssen
patent: 4413159 (1983-11-01), Huizinga et al.

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