| 摘要 |
A power-up detector comprises a voltage divider for dividing a power voltage in a predetermined ratio, and a potential detector for comparing a predetermined potential with a potential divided by the voltage divider, and outputting the comparison result. Although the state of an external power voltage, which is inputted after a power-up signal is generated when a power voltage rises over a predetermined level, is changed by noise, the level of the power-up signal is not changed unless the power voltage falls below a predetermined level. Accordingly, a semiconductor device can be stably initialized.
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