Patent ID: 6310493
Filing Date: 2001-10-30
Classification: H03K

Abstract:
A semiconductor integrated circuit comprising:a first power source system providing a first supply potential and a grounding potential;a second power source system providing a second supply potential different from the first supply potential, and a grounding potential;input-output circuits which convert voltage levels of signals exchanged between said first power source system and said second power source system;an input circuit receiving a first data signal and a first control signal issued from an internal circuit operated by said first power source system, converting each voltage level of the first data signal and the first control signal to a voltage level of said second power source system, and outputting a second data signal and a second control signal;a flip-flop circuit, operated by said second power source system, and issuing the second data signal and the second control signal after respective delay times; anda tri-state output circuit, operated by said second power source system, controlling output of the second data signal depending on the second control signal.