Complementary transistor circuit for carrying out boolean functions

Abstract

Integrated circuit devices for carrying out boolean logic functions of at least two input variables. The integrated circuit device for carrying out the logical function of at least two input variables is characterized as follows: the transistors employed are bipolar transistors of a first conductivity type and of a second conductivity type opposite to said first conductivity type; the input variables are coupled respectively to the control electrodes of a first transistor of said first conductivity type, and of a second transistor of said second conductivity type provided in the load branch of said first transistor; said bipolar transistors of said first conductivity type and of said second conductivity type having essentially symmetrical switching characteristics, particularly their current gain factors in normal and inverted direction. For a NOR or NAND function first bipolar transistors arranged in series or parallel, of the one conductivity type, e.g. NPN transistors, are provided, in accordance with the number of input variables. Connected thereto, quasi in the load branch, are an equal number of second bipolar transistors of the opposite conductivity type, e.g. PNP transistors which are combined in parallel or series arrangement. The point of connection of the first and second transistors is the circuit output. The input signals are applied to the respective interconnected control electrodes of two transistors that are complementary to each other.