Power-on reset signal generating circuit

Details Power-on reset signal generating circuit Power-on reset signal generating circuit

1997-07-03

1999-08-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03L 700

Patent

active

059330368

ABSTRACT:
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.

REFERENCES:
patent: 5109163 (1992-04-01), Benhamida
patent: 5739708 (1998-04-01), LeWalter
patent: 5760577 (1998-06-01), Shizuya

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