Abstract: An output driver circuit is described which can be programmed by the user into tri-state or open-collector configurations, depending on the needs of the user. The driver circuit comprises a pair of a first pull-up and a pull-down FET transistor. The source of the pull-up transistor and drain of the pull-down transistor are both connected to the output of the driver. The gates of the pair of transistors are controlled by an input signal and its complement. The driver further includes a second pull-up FET whose source is connected to the output of the driver. The channel width to channel length ratio of the second pull-up transistor is at least about an order of magnitude greater than that of the first pull-up transistor. The driver further includes a control means responsive to the input signal for applying a second signal to the gate of the second pull-up transistor for programming the driver into tri-state or open-collector modes.