Low-power reset signal generating circuit improved in voltage ri

Details Low-power reset signal generating circuit improved in voltage ri Low-power reset signal generating circuit improved in voltage ri

1997-06-10

1999-04-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03L 700

Patent

active

058983279

ABSTRACT:
A reset signal generating circuit is provided between a power supply voltage terminal for supplying an electric voltage and ground for being maintained at a given potential. A CR time constant circuit has a first transistor and a first capacitor connected in series. A control circuit sets the start of operation for the first transistor. A discharge circuit discharges the electric charge stored on the first capacitor when electric power supply is turned off. A protection circuit against a negative over-voltage applied to the first transistor by the discharge circuit. To this end, a reset signal generating circuit provides a reset signal when restarting a power supply and positively outputting a reset signal even where the power supply has an abrupt rising characteristic, without consuming electric current in a steady state.

REFERENCES:
patent: 4405871 (1983-09-01), Buurma et al.
patent: 4939385 (1990-07-01), Dubujet
patent: 5528182 (1996-06-01), Yokosawa

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