| 摘要 |
PURPOSE: A power up signal generator is provided to enable a semiconductor to stably operate in normal mode and DVFS operation by combining a first power up signal and a second power up signal to generate a final power up signal. CONSTITUTION: A first power up signal generating unit(300) detects a first target level of a power supply voltage. The first power up signal generating unit generates a first power up signal. A second power up signal generating unit(320) detects a second target level of the power supply voltage. The second power up signal generating unit generates a second power up signal. A final power up signal generating unit(340) outputs a first power up signal in a normal operation mode. The final power up signal generation unit outputs a second power up signal in a low voltage operation mode.
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