Patent ID: 8362827

Claim:
A semiconductor device comprising: a functional circuit; a first transistor that exercises control as to whether or not a first power supply potential is to be delivered to said functional circuit; a second transistor that exercises control as to whether or not a second power supply potential is to be delivered to said functional circuit; a first external terminal supplied with a third power supply potential; a second external terminal supplied with a fourth power supply potential greater than said third power supply potential; a third external terminal supplied with the second power supply potential; and a power supply control circuit that delivers a first control signal having a first amplitude to said first transistor to control an electrically conducting state or an electrically non-conducting state of said first transistor, said power supply control circuit delivering a second control signal having said third power supply potential as a second amplitude to said second transistor to control an electrically conducting state or an electrically non-conducting state of said second transistor, said first amplitude being defined as a potential difference between the second and fourth power supply potentials, and said second amplitude being defined as a potential difference between the second and third power supply potentials, said functional circuit being in an operation state or in a standby state when said first and second transistors are in the electrically conducting state or in the electrically non-conducting state, respectively.