Patent ID: 6476638
Filing Date: 2002-11-05
Classification: H03K

Abstract:
A digital system for performing logical functions, comprising:a functional logic circuit; and an input driver circuit cooperating with the functional logic circuit and capable of accommodating a plurality of input/output voltage standards, the input driver circuit comprising: an inverter circuit in circuit communication with a signal input and having an output; a trigger circuit in circuit communication with the inverter circuit and having a trip point based on the input/output voltage standard of the signal input; and a control circuit cooperating with the trigger circuit and having a configuration input that turns on and off the trigger circuit, wherein the control circuit has a reference power supply input, and wherein the control circuit comprises a transistor and the configuration input comprises a gate connection to the input driver circuit internal power supply voltage and the reference power supply input comprises a source connection to a voltage source substantially equivalent to one of the plurality of input/output voltage standards.