Patent ID: 7197684

Claim:
An integrated circuit comprising: a first contact; a second contact; and an output circuit to provide a differential signal on the first and second contacts during a first mode of operation and a single-ended signal on the first contact during a second mode of operation, wherein the output circuit includes, a first variable resistor, coupled to a first voltage source and the first contact, responsive to a first control signal; a second variable resistor, coupled to a second voltage source and the second contact, responsive to a second control signal; a current source; a first transistor having a first electrode coupled to the first contact, a second electrode coupled to the current source and a gate to receive a first input signal; and, a second transistor having a first electrode coupled to the second contact, a second electrode coupled to the current source and a gate to receive a second input signal, wherein the differential signal is provided on the first and second contacts responsive to the first and second input signals.