PURPOSE: To improve the output waveform while satisfying the compatibility with the standard ECL by providing a differential amplifier circuit as an output drive circuit and a means generating a termination voltage at the inside of the titled device.

CONSTITUTION: An internal logic circuit 1 has a ground electrode 2 and a power electrode 3 and connected with a pair differential switches FETs 4, 5 constituting a differential amplifier circuit and a current source FE6 specifying the circuit current respectively. A signal from the internal logic circuit 1 is outputted via the differential amplifier circuit comprising FETs 4, 5, 6. Since a resistor 7 and a diode 8 constitute a constant voltage generating circuit as a termination potential generation circuit, a -0.8V being an H level of the standard ECL is outputted while termination resistors 13, 14 are connected between output terminals 11, 12 and a termination potential supply terminal 10.