TTL Output circuit having means for preventing output voltage ex

Details TTL Output circuit having means for preventing output voltage ex TTL Output circuit having means for preventing output voltage ex

1981-07-10

1983-11-01

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307454, 307458, H03K 19003, H03K 19084, H03K 19088

Patent

active

044131941

ABSTRACT:
A transistor-transistor logic circuit includes an output stage comprising a pull-up and pull-down transistor and an input stage for receiving one or more binary logic signals. First and second current drive transistors regulate base drive to the pull-up and pull-down transistors respectively. A first switching transistor turns said first current drive transistor off when the binary signals reach a first logic level. A second switching transistor turns the second current drive transistor on when the binary logic signals reach the first logic level. In this manner, negative reflections at the output of the circuit will not result in the pull-up transistor and its associated current drive transistor being turned off.

REFERENCES:
patent: 3473047 (1969-10-01), Bohn et al.
patent: 3641362 (1972-02-01), Gamble
patent: 3958136 (1976-05-01), Schroeder
patent: 3999080 (1976-12-01), Weathersby, Jr. et al.
patent: 4255670 (1981-03-01), Griffith

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