MULTI-VALVE INPUT LOGICAL CIRCUIT

PURPOSE:To decrease number of input terminals by transmitting a signal from an output terminal of a gate circuit where an input signal level inputted from input terminals connected in parallel exceeds a threshold value to an input terminal of a combined circuit so as to transmit an output signal according to the constitution of the combined circuit. CONSTITUTION:A multi-value input logical circuit 3 is provided in an integrated circuit 10 in addition to an internal circuit 1 and the circuit 3 consists of gate circuits 4-1-4-n having different threshold values v1-vn and the combined circuit 5. When an input signal (i) exceeding the threshold values v1-vn is inputted to input terminals connected in parallel of the circuits 4-1-4-n, the circuits 4-1-4-n output respectively a signal ''1'', which is transmitted to n-set of input terminals of the circuit 5. When this signal is inputted to gates 6-1-6-n in the circuit 5, only the gate 6-1 is conductive, a control signal c1 is outputted from the output terminal, other gates 6-2-6-n are blocked, causing no control signals c2-cn to be outputted. Further, the signal c1 is transmitted to the internal circuit 1 in the circuit 10.