Power-on reset circuit with separate power-up and brown-out trig

Details Power-on reset circuit with separate power-up and brown-out trig Power-on reset circuit with separate power-up and brown-out trig

1997-02-26

1998-11-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 64, H03L 700

Patent

active

058314601

ABSTRACT:
A power-on reset (POR) circuit including a first single-level POR, a second single-level POR, a combining circuit, and a latch. Responsive to the voltage on a voltage supply terminal, the first single-level POR generates a first reset signal which terminates at a first trigger level voltage, and the second single-level POR generates a second reset signal which terminates at a second trigger level voltage. A combining circuit logically combines the first and second reset signals, and generates a combined output signal. This output signal controls a latch which provides the POR signal. When the supply voltage is below both trigger levels a POR signal is generated. When the supply voltage is above both trigger levels, no POR signal is generated. When the supply voltage is between trigger levels of the two POR circuits, the combining circuit leaves a floating output signal. Thus the latch does not switch. Thus, the output of the POR circuit provides a reset pulse which, at power-up is triggered at the first (higher) single-level POR trigger level voltage, and during brown-out is triggered by the second (lower) single-level POR trigger level voltage.

REFERENCES:
patent: 5534804 (1996-07-01), Woo
patent: 5565807 (1996-10-01), Ward

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