CMOS bidirectional buffer without enable control signal

Details CMOS bidirectional buffer without enable control signal CMOS bidirectional buffer without enable control signal

1996-03-28

1998-09-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327379, H03K 1716

Patent

active

058084924

ABSTRACT:
A bidirectional buffer circuit is provided with a terminal, an input buffer, a steady state output driver and a strong output driver. The input buffer is for receiving an input signal from the terminal. The steady state output driver includes a weak driver for driving the terminal to a first voltage corresponding to a first particular logic value of the output signal. The weak driver has a limited driving capacity that can be out-driven by the input signal. The strong output driver is for driving the terminal to the first voltage. The strong output driver has a greater driving capacity than the weak output driver. Enable circuitry is also provided. The enable circuitry includes at least one delay circuit with a particular delay period. The enable circuitry enables the strong output driver in response to a transition of the output signal from a complement of the first logic value to the first logic value. However, the enable circuitry only enables the strong driver during the delay period of the delay element.

REFERENCES:
patent: 4306163 (1981-12-01), Blume, Jr. et al.
patent: 4829199 (1989-05-01), Prater
patent: 4975598 (1990-12-01), Borkar
patent: 5241221 (1993-08-01), Fletcher et al.
patent: 5410262 (1995-04-01), Kang
patent: 5512854 (1996-04-01), Park

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