| 摘要 |
A power source voltage monitoring circuit for monitoring self power source voltage comprises a reference voltage circuit which is supplied with a power source voltage, and generates and outputs a reference voltage in accordance with the power source voltage, a comparator which is supplied with an output voltage output from the reference voltage circuit and a voltage varying with the power source voltage, compares the voltages, and outputs a result of the comparison, and a control circuit which prevents the voltage in accordance with the power source voltage from being input to the comparator before the voltage output from the reference voltage circuit reaches a predetermined reference voltage.
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