Input or output selectable circuit pin

Details Input or output selectable circuit pin Input or output selectable circuit pin

1994-12-01

1996-07-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

327 99, 327407, H03K 519

Patent

active

055393381

ABSTRACT:
A circuit for selecting between two states and using the same pin as an input and an output. On power-up, the pin can be connected to either a grounded resistor (to select the first state) or the power supply (to select the second state). The input signal generates a logic select signal. The logic select signal selects between first and second logic formats. If the first format is selected, the pin is used to output a reference voltage for that format. If the second format is selected, the logic select signal also provides a disable signal, that prevents the reference voltage output from appearing on the pin.

REFERENCES:
patent: 4683382 (1987-07-01), Sakurai et al.
patent: 4928056 (1990-05-01), Pease
patent: 4950921 (1990-08-01), Takada
patent: 5034625 (1991-07-01), Min et al.
patent: 5075569 (1991-12-01), Branson
patent: 5247209 (1993-09-01), Cheng
patent: 5396114 (1995-03-01), Lee et al.

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