Patent ID: 6339358
Filing Date: 2002-01-15
Classification: G11C,H01L

Abstract:
A semiconductor integrated circuit comprising:a plurality of MOS logic circuits formed over a semiconductor substrate; a plurality of first sub-power supply lines extending in a first direction; a plurality of second sub-power supply lines, each connected at intersection portions to said first sub-power supply lines, extending in a second direction crossing to said first direction; a main power supply line extending in said second direction; and a plurality of first switching MOS transistors for connecting said first sub-power supply lines to said main power supply line extending in said second direction, wherein said first switching MOS transistors are kept off in an operation stop state of said MOS logic circuits, wherein said first switching MOS transistors are kept on in an operable state of said MOS logic circuits, another main power supply line; and a plurality of second switching MOS transistors for connecting said second sub-power supply lines to said another main power supply line, wherein said second switching MOS transistors are kept off in an operation stop state of said MOS logic circuits and kept on in an operable state of said MOS logic circuits, wherein said main power supply line extending in said second direction includes a first main power supply line to which a first power supply voltage is supplied and second main power supply line to which a second power supply voltage having a level lower than that of the first power supply line is supplied, wherein said another main power supply line includes a third main power supply line to which the first power supply voltage is supplied and a fourth main power supply line to which the second power supply voltage is supplied, and wherein said MOS logic circuits each include a p-channel MOS transistor, the source of said p-channel MOS transistor is connected to said first main power supply line through a corresponding first switching MOS transistor, and the source of said p-channel MOS transistor is connected to said third main power supply line through a corresponding second switching MOS transistor.