Abstract: A DTT type basic logic circuit exhibiting improved immunity to noise and including input diodes for receiving input signals A, B, . . .; an input transistor the emitter of which receives an additional input signal X and the base of which is connected to the anodes of the input diodes; and an output inverter transistor disposed so that the signal at the output thereof represents the logic function X(AB . . .). From this circuit, a family of logic circuits suitable for realizing very-large-scale-integration logic networks in a master slice can be developed. The master slice comprises general-purpose cells in which pre-diffused semiconductor elements can be interconnected to form the desired circuits.