High speed logic gate with simulated open collector output

Details High speed logic gate with simulated open collector output High speed logic gate with simulated open collector output

1986-04-16

1988-01-26

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307458, 307473, 307270, 307280, H03K 19088, H03K 19084, H03K 1900, H03K 301

Patent

active

047218673

ABSTRACT:
A high speed logic gate is disclosed in which the voltage across the output transistor is clamped by a diode, a current switch transistor, a resistor connected between the diode and the transistor and a resistor connected to ground. A selectable high impedance is provided to enable the output of the logic gate to simulate an open collector output.

REFERENCES:
patent: 3217181 (1965-11-01), Zuk
patent: 3348162 (1967-10-01), Atkins
patent: 4581550 (1986-04-01), Ferris et al.
The TTL Data Book for Design Engineers, Texas Instruments, 1976, pp. 6-27.
The Linear and Interface Circuits Data Book for Design Engineers, Texas Instruments, 1973, pp. 8-95.

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