Patent ID: 6617916
Filing Date: 2003-09-09
Classification: G06F,H02M,Y02B

Abstract:
A semiconductor integrated circuit, comprising:a logic circuit having a logic element driven by a driving voltage applied from a dummy power supply line; and a mode-switching circuit for supplying potential in accordance with a reference potential, to said dummy power supply line; wherein, during an active mode in which said logic circuit is driven, said mode-switching circuit keeps the potential of said dummy power supply line at a first potential for driving said logic element, and, during a sleep mode in which said logic circuit is not driven, said mode switching circuit keeps the potential of said dummy power supply line at a second potential, wherein said second potential is lower than said first potential and high enough for a data holding element of said logic element to maintain data held therein, and during said sleep mode, when data storage is needed, said second potential is a first lower potential, which is higher than zero volts and lower than said first potential; and when no data storage is needed, said second potential is a second lower potential, which is higher than zero volts, and lower than said first lower potential.