A low voltage differential signalling driver is provided in which a first output node and a second output node provide a differential signal. First differential steering switch circuitry is switched in dependence on a differential input signal to selectively connect the first output node to a voltage supply via a current source, while second differential steering circuitry is switched in dependence on an inverse version of the differential input signal to connect the second output node to the voltage supply via the current source. Slew control circuitry is provided, configured to establish a current discharge path for the current source during the polarity transition of the differential input signal, thus maintaining a symmetric slew rate of the output signals at the first output node and second output node.