Patent ID: 8531206

Claim:
An output driver for use within an integrated circuit device, the output driver comprising: inputs to receive an impedance control value and an equalization control value; a plurality of impedance-calibration signal drivers coupled in parallel to a signal output node, the impedance-calibration drivers being selectively enabled based on the impedance control value such that each enabled one of the impedance-calibration signal drivers contributes a respective output signaling current corresponding to a first data input regardless of the equalization control value, the respective output signaling currents of the enabled impedance-calibration signal drivers constituting an entirety of signaling currents contributed to calibrate an impedance of the output driver; and a plurality of equalization signal drivers coupled to the signal output node in parallel with the plurality of impedance-calibration signal drivers, wherein first and second subsets of the plurality of equalization signal drivers are selected in accordance with the equalization control value and contribute respective output signaling currents regardless of the impedance control value, each of the first subset of the plurality of equalization signal drivers contributing a respective output signaling current corresponding to the first data input and each of the second subset of the plurality of equalization signal drivers contributing a respective output signaling current corresponding to a second data input.