Patent ID: 9419588
Filing Date: 2016-08-16
CPC Classification: H03K,H04L

Claim Text:
1. An output driver to provide a constant output impedance in response to a plurality of different power supply voltage level inputs, the output driver comprising: a plurality of individual driver circuits, each one of the plurality of individual driver circuits configured to provide a plurality of predetermined output impedances in response to a plurality of power supply voltage level inputs; and a decoder coupled to each of the plurality of individual driver circuits, the decoder for receiving a digital codeword representative of a voltage level of a power supply coupled to the output driver, the decoder for decoding the digital codeword and for activating one or more of the individual driver circuits based upon the decoded digital codeword, the activation of the one more individual driver circuits to provide a constant output impedance from the output driver in response voltage level of power supply coupled output to the output driver, wherein the constant output impedance from the driver is a summation of the predetermined output impedances of each of the activated one or more individual driver circuits.