TTL compatible CMOS input buffer

A TTL to CMOS buffer includes first and second field effect transistors of opposite conductivity types connected to form an inverter. The main current conducting path of a third transistor is connected in series with the current conducting paths of the first and second transistors. The control terminal of the third transistor is connected to a power supply. In a preferred embodiment, a bipolar transistor is connected between the output of the inverter circuit and the buffer output. The bipolar transistor may be a common parasitic device produced in conjunction with the CMOS circuits. This transistor offers a degree of temperature compensation to the buffer circuit output.