Patent ID: 8704410

Claim:
A semiconductor device comprising: a first power line to supply a first voltage to a plurality of internal circuits; a second power line to supply the first voltage to the plurality of internal circuits; a plurality of first switches provided between the first power line and each of the plurality of internal circuits; a plurality of second switches provided between the second power line and each of the plurality of internal circuits; and a control circuit to acquire amounts of noise and voltage drop at power-on in each internal circuit included in the plurality of the internal circuits, and control a first switch of a first internal circuit and a first switch of a second internal circuit included in the plurality of the internal circuits based on the acquired amounts of noise and voltage drop wherein the control circuit turns on a second switch of the first internal circuit after turning on the first switch of the first internal circuit, the control circuit turns off the first switch of the first internal circuit after turning on the second switch of the first internal circuit, the control circuit turns on a second switch of the second internal circuit after turning on the first switch of the second internal circuit, the control circuit turns on the first switch of the first internal circuit when the amount of the noise acquired is smaller than the amount of the voltage drop acquired, and the control circuit turns off the first switch of the second internal circuit when the amount of the noise acquired is larger than the amount of the voltage drop acquired.