Input/output circuit with programmable input sensing time

Details Input/output circuit with programmable input sensing time Input/output circuit with programmable input sensing time

1989-11-03

1991-07-02

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307234, 307352, 377 39, H03K 5153, H03K 5135

Patent

active

050292722

ABSTRACT:
An input/output circuit of an integrated circuit with a programmable input sensing time. The output driver of the input/output circuit is open drain and is designed for use in a wire-OR configuration with other devices. The input/output circuit is coupled to a bonding pad and through the bonding pad to a device pin, and counts a programmable number of clock cycles between a negation of an output drive signal and when the state of the pin is sampled as an input. Since different applications use a wide range of values for external pullup resistors, the input/output circuit allows adjustment of the sample time to fit a particular application.

REFERENCES:
patent: 4498176 (1985-02-01), Wagner
patent: 4566111 (1986-01-01), Tanagawa
patent: 4617480 (1986-10-01), Au
patent: 4692710 (1987-09-01), Shvartsman
patent: 4710721 (1987-12-01), Camus
patent: 4756013 (1988-07-01), Van Veldhuizen

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