| 摘要 |
Provided is A power-up signal generating circuit, comprising: a voltage sensing unit for sensing that a potential of an external power source voltage is above a certain potential, the voltage sensing unit comprising a first switching element operated according to the external power source voltage and a resistor serially connected to the first switching element; a power-up signal generating unit for generating a power-up signal according to an output signal of the voltage sensing unit, the power-up generating unit comprising a second switching element; and a buffering unit for buffering the power-up signal from the power-up signal generating unit up to a certain potential and outputting the buffered power-up signal, wherein a timing of generating the power-up signal is controlled by the second switching element being turned on and off according to a threshold voltage of the first switching element.
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