Tri-state output buffer circuit

Details Tri-state output buffer circuit Tri-state output buffer circuit

1994-12-27

1996-08-20

Westin, Edward P.

Electronic digital logic circuitry

Tri-state

With field-effect transistor

326 58, 326 83, 327407, H03K 190948

Patent

active

055482295

ABSTRACT:
A single data output terminal and an output portion having a pair of output control terminals for generating a ternary output, are disposed for a plurality of data input terminals and a plurality of control input terminals in the same number as that of the data input terminals. Input changeover portions have (i) a state where data signals can be entered into the output control terminals and (ii) a state where the data signals cannot be entered into the output control terminals. An input control portion supplies, according to the states of control signals entered therein, a changeover signal for switching the input changeover portions to (i) a mode in which one of the input changeover portions is set to the conductive state, or (ii) a mode in which all of the input changeover portions are set to the non-conductive state. According to the states of entered control signals, an output control portion controls the output portion such that a high impedance signal is supplied according to a changeover signal for setting all of the input changeover portions to the non-conductive state, and that there is generated an output signal identical with the value of an entered binary data signal according to a changeover signal for setting one of the input changeover portions to the conductive state.

REFERENCES:
patent: 4037114 (1977-07-01), Stewart et al.
patent: 4804867 (1989-02-01), Okitaka et al.
patent: 5120992 (1992-06-01), Miller et al.
patent: 5179299 (1993-01-01), Tipon
patent: 5369316 (1994-11-01), Chen et al.

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