Dien Dinh Ngo

US Patent:

57867208, Jul 28, 1998

Filed:

Sep 22, 1994

Appl. No.:

8/310621

Inventors:

Trung Nguyen - San Jose CA
Dien Ngo - Santa Clara CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

H03K 508

US Classification:

327321

Abstract:

A driver circuit that is powered by a power supply voltage has an output terminal, and includes a pull-up transistor for pulling the output terminal up toward the power supply voltage. A voltage divider that is connected across the power supply voltage has a tap connected in circuit to an input of the pull-up transistor and includes variable resistance elements whose resistance varies together with a threshold voltage of the pull-up transistor for limiting a voltage at the output terminal to within a predetermined range that is lower than the power supply voltage.