| 摘要 |
The power-supply voltage detection circuit to detect that an external power-supply voltage and/or an internal power-supply voltage generated from the external power-supply voltage goes out of predetermined regulation comprises a first comparator for detecting the internal power-supply voltage being equal to or less than a predetermined value, a second comparator for detecting the internal power-supply voltage being greater than a predetermined value, a first capacitor for AC-coupling one of the input terminals of the first comparator to the external power-supply voltage, and a second capacitor for AC-coupling one of the input terminals of the second comparator to the external power-supply voltage.
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