Walter L Lowe

US Patent:

48018252, Jan 31, 1989

Filed:

Jul 6, 1987

Appl. No.:

7/070284

Inventors:

Michael E. Stanley - Mesa AZ
Walter V. Lowe - Gilbert AZ
Byron G. Bynum - Tempe AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 1902
H03K 1901

US Classification:

307473

Abstract:

A circuit is provided which comprises a push-pull switching stage responsive to applied control signals for alternately establishing high and low output voltage levels at an output of the circuit responsive to control signals which are derived from an applied input logic signal and which is disabled in response to the control signals being disabled for providing a high output impedance at the output. The circuit includes circuitry responsive to an applied disable signal for disabling the control signals while enabling further circuitry, the latter providing a transient current path to improve the transition from the high voltage output level to the high output impedance condition while establishing a pseudo high output impedance at the output of the circuit until the push-pull stage is disabled.