Transistor-transistor-logic circuit

Details Transistor-transistor-logic circuit Transistor-transistor-logic circuit

1976-09-02

1978-01-17

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307200A, 307213, 307299A, 307317A, H03K 1908, H03K 1912, H03K 1936

Patent

active

040694283

ABSTRACT:
Disclosed is a transistor-transistor-logic (TTL) circuit which is testable by D. C. Testing Techniques. The improvement includes a high impedance network for providing sufficient base drive to drive the output transistor into conduction when the malfunctioning input transistor fails to provide a turn-off logic level. The high impedance network can be a Schottky barrier diode and an epitaxial resistor connected in a series path between a potential supply and the base region of the output transistor.

REFERENCES:
patent: 2993128 (1961-07-01), Carroll
patent: 3083303 (1963-03-01), Knowles et al.
patent: 3508078 (1970-04-01), Komamiya et al.
patent: 3904979 (1975-09-01), Suzuki

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