Programmable logic and driver circuits

Granted: May 23, 1989
Patent Number: 4833349
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…