Semiconductor device with voltage down circuit changing power supply voltage to operating voltage

A semiconductor device, comprising:

• a circuit block having a plurality of circuit units which are respectively operated at a plurality of operating voltages different from each other;
• a plurality of voltage changing units, arranged without making a connection with the circuit block, for changing a power supply voltage obtained from an outside to the operating voltages of the circuit units of the circuit block respectively;
• and
• supplying means for supplying the operating voltages obtained by the voltage changing units to the circuit units of the circuit block.

A semiconductor device, comprising:

• a circuit block having a circuit unit which is operated at a prescribed operating voltage;
• a plurality of voltage changing units, arranged without making a connection with the circuit block, for respectively changing a power supply voltage obtained from an outside to the prescribed operating voltage of the circuit unit of the circuit block;
• and
• supplying means for supplying electric power of the prescribed operating voltage, which is obtained by a specific voltage changing unit selected from the voltage changing units, to the circuit unit of the circuit block and additionally supplying electric power of the prescribed operating voltage obtained by another voltage changing unit or the other voltage changing units to the circuit unit of the circuit block in a case where the electric power of the operating voltage obtained by the specific voltage changing unit is insufficient for the circuit unit of the circuit block.