Apparatus and method for a programmable trip point in an I/O...

Details Apparatus and method for a programmable trip point in an I/O... Apparatus and method for a programmable trip point in an I/O...

2005-11-29

2005-11-29

Le, Don (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S038000

Reexamination Certificate

active

06970015

ABSTRACT:
The invention enables the performance of the input and output stages of an I/O circuit to be modified after an IC is manufactured. In one embodiment, the I/O circuit includes an output driver, programmable pre-driver, programmable Schmitt-trigger input buffer, control circuit and logic circuit. Depending on the number of pull-up and pull-down MOS transistor pairs or “cells” that are enabled in the programmable pre-driver and their different sizes, the overall sizing ratio imbalance between the transistors may be programmed. In particular, the high and low trip points for activation of the output driver is related to an imbalance in the overall sizing ratio of transistors enabled in the programmable pre-driver. This affects the timing characteristics of the output driver.

REFERENCES:
patent: 5418476 (1995-05-01), Strauss
patent: 5440244 (1995-08-01), Richter et al.
patent: 5933025 (1999-08-01), Nance et al.
patent: 6242943 (2001-06-01), El-Ayat
patent: 6448809 (2002-09-01), Goetting et al.

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