An integrated circuit, among other embodiments, includes an output circuit to provide a differential signal on first and second contacts during a first mode of operation, such as in a read or write mode of operation, and a single-ended signal on the first contact during a second mode of operation, such as a test mode of operation. A first variable resistor, responsive to a first control signal, is coupled to a first voltage source and the first contact. A second variable resistor, responsive to a second control signal, is coupled to a second voltage source and the second contact. A first transistor has 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. A second transistor has 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.