Patent ID: 6677797
Filing Date: 2004-01-13
Classification: H03K

Abstract:
A semiconductor integrated circuit comprising:a first logic circuit which has a first input terminal and comprising a first logic block including a p-type FET with a threshold voltage of Vtp1 and a first inverted-logic block including an n-type FET with a threshold voltage of Vtn1, said first logic block and said first inverted-logic block being connected between a first power supply with a potential V1 and a reference potential; a second logic circuit which has the same logic function as that of said first logic circuit, said second logic circuit having a second input terminal connected to said first input terminal and comprising a second logic block including a p-type FET with a threshold voltage of Vtp2 (Vtp21) and a second inverted-logic block including an n-type FET with a threshold voltage of Vtn2 (Vtn21), said second logic block and said second inverted-logic block being connected between a second power supply with a potential of V2 (V21) and said reference potential; and an output switch circuit which intervenes between said first logic block and said first inverted-logic block in said first logic circuit and between said second logic block and said second inverted-logic block in said second logic circuit and which has a control signal terminal to which a control signal is inputted and an output terminal from which one of an output of said first logic circuit and an output of said second logic circuit is outputted according to said control signal.