Patent ID: 7724581

Claim:
A discharge order control circuit for controlling a discharge order of a plurality of internal power supplies each of which power is generated based on power supplied from an external power supply, the discharge order control circuit comprising: a pool circuit that stores electric charges provided from a potential of the external power supply; a first delay circuit that operates on the electric charges stored in the pool circuit and delays a discharge signal generated when potential of the external power supply is lowered to a predetermined potential level, the first delay circuit including a first inverter array having a plurality of stages each containing an inverter, the plurality of stages including a final stage that outputs the delayed discharge signal, and only the inverter of the final stage which generates an RC delay; and a first discharge unit that discharges a first internal power supply included in the plurality of internal power supplies in response to the delayed discharge signal output from the inverter of the final stage of the first inverter array.