Patent ID: 6724223
Filing Date: 2004-04-20
Classification: G11C,H01L

Abstract:
A semiconductor device having a first mode in which said semiconductor device is driven by a first power supply voltage and receives a first signal having an amplitude voltage lower than said first power supply voltage, and a second mode in which said semiconductor device is driven by a second power supply voltage lower than said first power supply voltage and receives a second signal having a second amplitude voltage lower than said second power supply voltage, said semiconductor device comprising:a first logic circuit activated in said first mode to be driven by a first internal power supply voltage equal in level to said second power supply voltage, detecting whether said first signal is higher in level than a first threshold voltage, and outputting a signal of level according to a detection result; a second logic circuit activated in said second mode to be driven by a second internal power supply voltage lower than said first internal power supply voltage, detecting whether said second signal is higher in level than a second threshold voltage, and outputting a signal of level according to a detection result; and an internal circuit performing a predetermined operation in response to output signals of said first and second logic circuits.