1. An MOS transistor universal output circuit capable of operating with both positive and negative power supplies connected thereto and driving directly coupled logic gates that are adapted to operate using only a positive power supply, said circuit comprising: an output stage including a pair of MOS output transistors one coupled to act as a current source and one coupled to act as a current sink to an output terminal; means for driving said pair of output transistors with complementary logic signals; and means for limiting current flow in said output transistor coupled to act as a current sink, said means for limiting including amplifier means having an input terminal coupled to said output stage output terminal and an output terminal coupled to said driving means, and switching means operable to disable said amplifier means when said current sink transistor is turned off and to enable said amplifier means when said current sink transistor is turned on.