Semiconductor logic circuit.

摘要

A logic circuit includes an output pull up npn bipolar transistor (15; 28; 38), an output pull down pnp bipolar transistor (16; 29; 39), a first insulated gate type transistor (11, 12; 21, 22, 23, 24; 31, 32, 33, 34) for controlling the base potential of the output pull up bipolar transistor in response to an input signal, a second insulated gate type transistor (14; 25, 26, 27; 35, 36, 37) for controlling the base potential of the output pull down bipolar transistor in response to the input signal, and an impedance element (13; 18; 30; 40) for short-circuiting the base and the collector of the output pull down bipolar transistor. The impedance element is separated from the signal input terminal, and is formed by a resistance or an insulated gate type transistor operating in response to the base potential of the pull up transistor. The output pull up and pull down transistors both have collector grounded arrangement. <IMAGE>