| 摘要 |
<p>PURPOSE:To generate two signals of an alarm signal for performing the end processing of a computer or the like and a reset signal for stopping that processing without using any high-accuracy reference voltage generation at the reset circuit depending on voltage detection. CONSTITUTION:A reference voltage generator 22 generates a voltage for detecting an alarm. A comparator 23 compares a power supply voltage with the output of the reference voltage generator 22 and outputs a high level when the power supply voltage is lower than the reference voltage. On the other hand, a differentiator 24 is used for detecting whether the power supply voltage is in a rising process or a falling process. When it is in the rising process, the output of a comparator 25 is turned to a high level. Further, a delay circuit 27 delays the outputs of the comparator 23 just for time required as the alarm signal.</p> |
