Logic circuit

Details Logic circuit Logic circuit

1987-09-17

1988-09-27

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, H02H 320

Patent

active

047746203

ABSTRACT:
A logic circuit which reduces occurrence of breakdown of the pull-down transistor and pull-up transistor in the output stage when a high voltage is applied to the power supply line and ensures high voltage resistance. The logic circuit controls a pull-up transistor provided between a first power supply and an output terminal which turns ON and OFF in accordance with a collector voltage of a phase splitter transistor and controls the pull-down transistor provided between the second power supply and output terminal with an emitter voltage. Breakdown of the pull-down and pull-up transistors can be reduced and a high voltage resistance ensured by providing a protection circuit which discharges the base of the pull-down transistor and turns OFF the pull-down transistor by detecting when a voltage difference between the first power supply and the second power supply exceeds a specified value.

REFERENCES:
patent: 4036199 (1977-07-01), Chateau
patent: 4321509 (1982-03-01), Miyaji et al.
patent: 4349854 (1982-09-01), Mori et al.
patent: 4359652 (1982-11-01), Jarrett et al.
patent: 4513341 (1985-04-01), Kollanyi
patent: 4573099 (1986-02-01), Ganesan et al.
K. Pollmann et al., IBM Technical Disclosure Bulletin, Dec. 1983, vol. 26, No. 7B, pp. 3675-3677.

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