Patent ID: 7755396

Claim:
A semiconductor device comprising: a standard cell having an operating circuit that is provided with a virtual supply voltage through a virtual voltage rail and is provided with a first supply voltage through a first voltage rail; and a power gating cell having: at least one slice block that includes a transistor that is in contact with a second voltage rail at a first electrode and is in contact with the virtual voltage rail at a second electrode and switches an electrical connection between the second voltage rail and the virtual voltage rail in response to a control signal; a first isolator block that is arranged in a first side portion of the slice block and insulates the slice block from outside; and a second isolator block that is arranged in a second side portion of the slice block and insulates the slice block from outside, the virtual voltage rail and the first voltage rail being formed in a first metal layer, the second voltage rail being formed in a third metal layer different from the first metal layer and being arranged above the power gating cell.