| 摘要 |
A power-on-reset circuit used to detect a first supply voltage for resetting a semiconductor device within an electric system is provided. The power-on-reset circuit is equipped with the first supply voltage to power the semiconductor device and a second supply voltage generated prior to the first supply voltage. The power-on-reset circuit includes a voltage divider, a bandgap reference circuit and a comparator. The voltage divider is powered by the first supply voltage to generate a proportional input voltage. The bandgap reference circuit is powered by the second supply voltage to generate a constant reference voltage. The comparator compares the proportional input voltage with the constant reference voltage, so as to generate a power-on-reset signal when the proportional input voltage exceeds the constant reference voltage. Therefore, when the first supply voltage is sufficiently large, the power-on-reset circuit can correctly reset the electric system.
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