Electronic digital logic circuitry – Tri-state
Patent
1995-10-02
1996-12-03
Callahan, Timothy P.
Electronic digital logic circuitry
Tri-state
327333, 326 30, H03L 500
Patent
active
055812015
ABSTRACT:
A digital control circuit is constructed to use a single signal line for the dual functions of control and sensing the presence of the controlled device. The control circuit includes a driver element having an output capable of being placed in a high impedance allowing the signal line to be pulled to a first predetermined voltage potential when the controlled device is connected thereto, and a second voltage potential when the controlled device is absent therefrom. A receiver circuit monitors the signal line to sense presence of the one or the other of the voltage potentials.
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Brown David A.
Kagy Carl W.
Sonner David P.
Watson William J.
Callahan Timothy P.
Tandem Computers Incorporated
Wells Kenneth B.
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