High impedance detecting circuit and interface circuit

Details High impedance detecting circuit and interface circuit High impedance detecting circuit and interface circuit

1996-09-25

1999-02-23

Tokar, Michael J.

Electronic digital logic circuitry

Tri-state

326 57, H03K 1900, H03K 1902

Patent

active

058748350

ABSTRACT:
A voltage applying means applies a voltage which determines the logical value of a node to the node, with the signal at the node fixed. Then, an applied voltage removing means removes the voltage applied by the voltage applying means. First and second detecting means detects the logical value of the node before and after the voltage application and removal of the applied voltage. A judging means compares the results of detection of the first and second detecting means to judge whether or not the node is at a high impedance.

REFERENCES:
patent: 4743842 (1988-05-01), Langone et al.
patent: 5296757 (1994-03-01), Koizumi
patent: 5598110 (1997-01-01), Chang

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