Circuit for providing fast logic transitions

Details Circuit for providing fast logic transitions Circuit for providing fast logic transitions

1993-04-30

1995-04-18

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327170374, 326128, 326 56, 326 19, H03K 1716

Patent

active

054081360

ABSTRACT:
A TTL gate (26) with a Darlington output (14,14A,16) includes three circuits (28,30,32) to decrease the gate switching time during an output transition from a high to a low logic state and from a high impedance state to a low logic state. Each speedup circuit drives the gate input transistor (12) for a different length of time, ensuring that the lower output transistor (16) turns on rapidly and remains on until the output transition is complete. The circuits ensure, however, that the additional drive current (82) is time limited to avoid excessive power consumption.

REFERENCES:
patent: 4486674 (1984-12-01), Neely
patent: 4704548 (1987-11-01), Strong et al.
patent: 4737665 (1988-04-01), Ovens
patent: 4839538 (1989-06-01), Curtis
patent: 4871926 (1989-10-01), Neely et al.
patent: 4973862 (1990-11-01), Luich et al.

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