| 摘要 |
A power-on reset signal generating circuit includes an oscillation circuit for generating an alternating signal, and a level sensing type switching circuit for detecting when the alternating signal of the oscillation circuit is above a predetermined level and changing its output level based on the detection. The level sensing type switching circuit includes a level sensing circuit for generating a level sensing signal, and a switching circuit for receiving the output of the level sensing circuit and switching the connection state of the circuit. The switching circuit includes a MOS transistor switch whose one gate is connected to the output of the level sensing circuit and whose one end is connected to the power source, a resistor, a capacitor chargeable by the power source through the MOS transistor switch and the resistor, and an inverter for inverting the output of the charged voltage when it is above a predetermined level.
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