Patent ID: 7211996

Claim:
A semiconductor device having a semiconductor integrated circuit, the semiconductor device comprising: a first plurality of leads, each of the leads for supplying the semiconductor device with a first power source from an outside; a second lead for supplying the semiconductor device with a second power source having a voltage different from a voltage of the first power source from an outside; a first internal power source line directly connected to an internal circuit including a plurality of logic circuits of the semiconductor integrated circuit, the first internal power source line for supplying the internal circuit of the semiconductor integrated circuit with the first power source; a second internal power source line directly connected to the internal circuit of the semiconductor integrated circuit, the second internal power source line for supplying the internal circuit with the second power source; a first plurality of internal terminals, each of the internal terminals coupled to a corresponding one of the first plurality of leads and supplying the first internal power source line with the first power source from a corresponding one of the first plurality of leads; a second internal terminal coupled to the second lead and supplying the second internal power source line with the second power source from the second lead; a first switching circuit portion including a first plurality of switching circuits, each of the first plurality of switching circuits interposed between a corresponding one of the first plurality of internal terminals and the first internal power source line; and a second switching circuit portion for providing an electric current between the first and the second internal power source lines.