Patent ID: 7436205

Claim:
A semiconductor device comprising: a first voltage interconnection supplying a first voltage; a second voltage interconnection supplying a second voltage; a third voltage interconnection supplying a third voltage; a first voltage supply interconnection arranged between said first and second voltage interconnections; an internal circuit connected between said second voltage interconnection and said first voltage supply interconnection, and forming a current path between said second voltage interconnection and said first voltage supply interconnection according to an input signal; and a first voltage supply control circuit connected between said first voltage interconnection and said first voltage supply interconnection, and being capable of controlling a conductive state between said first voltage interconnection and said first voltage supply interconnection according to an input instruction signal, wherein said first voltage supply control circuit includes: a first switch arranged between said first voltage supply interconnection and said first voltage interconnection, and a first logic circuit controlling said first switch according to said instruction signal; and said first logic circuit includes: a second switch arranged between said third voltage interconnection and a control end of said first switch, and electrically coupling said third voltage interconnection to the control end of said first switch according to an instruction signal setting said first switch to a conductive state, and a third switch arranged between said first voltage supply interconnection and the control end of said first switch, and electrically coupling said first voltage supply interconnection to the control end of said first switch when said first switch attains a non-conductive state with a lower amount of current than in a conductive state caused by said second switch attaining a non-conductive state.