Output buffer circuit, input buffer circuit and bi-directional b

Details Output buffer circuit, input buffer circuit and bi-directional b Output buffer circuit, input buffer circuit and bi-directional b

1994-12-20

1996-07-02

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 87, 326 81, 326 58, 326 68, H03K 19094, H03K 1706

Patent

active

055326218

ABSTRACT:
Bi-directional buffer circuit comprises a second P-channel transistor whose back gate is connected to a pad, a third P-channel transistor disposed between a gate of the second P-channel transistor and the pad with its back gate connected to the pad, and a first N-channel transistor and a fifth N-channel transistor whose gates are connected to a power source, so that an output buffer circuit, an input buffer circuit and a bi-directional buffer circuit can be produced without necessity of any additional processing step, wherein merely a single power source is incorporated, and a voltage higher than the source voltage is permitted to be applied to a common bus.

REFERENCES:
patent: 4217502 (1980-08-01), Suzuki et al.
patent: 4324991 (1982-04-01), Tamaki
patent: 4438352 (1984-03-01), Mardkha
patent: 4800303 (1989-01-01), Graham et al.
patent: 4853560 (1989-08-01), Iwamura et al.
patent: 4890051 (1989-12-01), Kim et al.
patent: 4978905 (1990-12-01), Hoff et al.
patent: 5128560 (1992-07-01), Chern et al.
patent: 5321319 (1994-06-01), Mahmood

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