Dual feature input/timing pin

Details Dual feature input/timing pin Dual feature input/timing pin

1995-03-30

1996-04-16

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

327403, 327404, 327415, 327416, 327565, H03K 1762

Patent

active

055086500

ABSTRACT:
An apparatus for enabling an IC pin to function in a dual mode, which apparatus includes a first switch for coupling the IC pin to an input terminal when the IC pin operates in an input mode, and a charging circuit for sourcing current to the IC pin during a charging cycle of a timer mode. The inventive apparatus further includes a discharging circuit for sinking current from the IC pin during a discharging cycle of the timer mode. In one embodiment, the inventive apparatus further includes a comparator for generating an activation signal, the activation signal being activated when a potential at the IC pin equals or exceeds a predefined voltage in the timer mode. In another embodiment, the comparator is disabled during the input mode.

REFERENCES:
patent: 4588092 (1986-05-01), Moechnig et al.
patent: 5321322 (1994-06-01), Verheyen et al.
patent: 5327018 (1994-07-01), Karlish et al.

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