| 摘要 |
A /POR circuit which can detect a power-on of a power supply voltage without fail even in a case where a potential of the power supply rises gently and which produces a /POR signal having a waveform sufficient for initializing internal circuits, as well as a semiconductor device having the /POR circuit. In a power-on reset circuit, a first line potential monitoring circuit and a second line potential monitoring circuit detect a line potential, and there is provided in a /POR signal waveform generation circuit a setting circuit which outputs a pulse signal in response to the results of such detection and operates in response to the pulse signal. Even when the potential of a power-on reset signal rises gently at power-on, the power-on reset signal can be brought to an activation potential without fail, thereby initializing internal circuits.
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