Internal drive circuit providing third input pin state

Details Internal drive circuit providing third input pin state Internal drive circuit providing third input pin state

1997-10-02

1999-11-23

Mis, David

Electronic digital logic circuitry

Tri-state

327162, H03K 190175, H03K 1920

Patent

active

059907045

ABSTRACT:
A multi-state input drive structure is provided to forward externally generated high and low input signals, as well as to receive at least a third, internally generated, comparatively weak signal, preferably an oscillating signal, which triggers a third internally forwarded signal when neither of the high and low input signals is received. The inventive circuit drives three internally forwarded output signals from a single external signal source. Since this circuit may be duplicated for every pin on a device for which two cycle delays do not affect performance, availability of a third input state on N inputs allows 3.sup.N input codes as opposed to 2.sup.N for the conventional "high" and "low" levels normally available.

REFERENCES:
patent: 4031410 (1977-06-01), Kikuchi

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