Patent ID: 7880521

Claim:
A differential driver, comprising: a first pull-up resistor connected a first output terminal; a second pull-up resistor connected a second output terminal; a plurality of differential-input transistor pairs connected to each of the first and second output terminals; current sources connected to each of the differential-input transistor pairs; and a slew rate controller configured to generate differential input signals to be applied to each of the differential-input transistor pairs in response to an input signal, wherein: the slew rate controller includes a plurality of delay circuits, each delay circuit being configured to receive the input signal and output the differential input signals to the differential-input transistor pairs simultaneously or sequentially, the current sources are configured to supply a fixed current to each of the differential-input transistor pairs, and at least one of the delay circuits is configured to delay the input signal by a first delay time during a slew-rate non-adjusting period, and delay the input signal by a second delay time during a slew-rate adjusting period, the second delay time being longer than the first delay time.