Power-on reset circuit and method

Details Power-on reset circuit and method Power-on reset circuit and method

1994-11-30

1996-06-04

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, 327205, H03K 1722

Patent

active

055237096

ABSTRACT:
A circuit and method for generating a power-on reset signal with a designable hysteresis is disclosed. The circuit includes a low voltage stage, a high voltage stage, and a hysteresis stage. The low voltage stage includes a resistor in series with a current mirror. The high voltage stage includes a current mirror in series with a diode and two resistors. The hysteresis circuit includes a transistor connected across one of the two resistors. The method for generating the power-on reset signal includes the steps of sinking a power-on reset signal low when a voltage source reaches a first V.sub.be voltage threshold; driving the power-on reset signal high when the voltage source reaches a second threshold value; and providing hysteresis to the power-on reset signal.

REFERENCES:
patent: 5136181 (1992-08-01), Yukawa
patent: 5302861 (1994-04-01), Jelinek

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