Data input/output control circuit

Details Data input/output control circuit Data input/output control circuit

1994-02-18

1995-07-04

Westin, Edward P.

Electronic digital logic circuitry

Tri-state

With field-effect transistor

326119, 326 58, H03K 1902

Patent

active

054303915

ABSTRACT:
There is disclosed a data input/output control circuit comprising: an input/output circuit for carrying out input of data from the exterior or output of data thereto; and an output circuit such that when the input/output circuit carries out output of data, it delivers, to the input/output circuit, data generated in the exterior and transferred by way of a signal line, while when the input/output circuit carries out input of data, it allows the node between the input/output circuit and the signal line to be placed in high impedance state. In this control circuit, the output circuit includes a switching element and a discharge element connected in series between the signal line and the input/output circuit. The switching element is operative in such a manner that when the input/output circuit carries out output of data, it is closed, while when the input/output circuit carries out input of data, it is opened. In addition, the discharge element is operative in such a manner that when the input/output circuit carries out output of data, it is inoperative, while when the input/output circuit carries out input of data, it discharges the node the switching element and the input/output circuit, thus placing the node between the input/output circuit and signal line in high impedance state.

REFERENCES:
patent: 4855623 (1989-08-01), Flaherty
patent: 4963766 (1991-10-01), Lundberg
patent: 5109166 (1992-04-01), Coburn
patent: 5132568 (1992-07-01), Kim
patent: 5179300 (1993-01-01), Rolandi

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