Processor supervisory circuit and method having increased range

Details Processor supervisory circuit and method having increased range Processor supervisory circuit and method having increased range

1996-02-07

1998-12-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 68, 327 72, 327143, 327198, H03L 700

Patent

active

058501568

ABSTRACT:
For use in a processor supervisory circuit, a power-on reset circuit, a method of producing a power-on reset ("RESET") signal and a power supply including the circuit. The circuit includes: (1) an adaptive, nonlinear voltage divider having a voltage input and a voltage output, the divider dividing an unscaled, unregulated voltage received at the voltage input by a factor that varies a function of the unscaled, unregulated voltage to produce a scaled, unregulated voltage at the voltage output and (2) a comparison circuit for comparing the scaled, unregulated voltage with a scaled, regulated voltage to produce the RESET signal when the scaled, regulated voltage exceeds the scaled, unregulated voltage, the divider being adaptive and nonlinear to ensure that the comparison circuit continuously produces the RESET signal when the scaled, regulated voltage exceeds the scaled, unregulated voltage and thereby avoid premature activation of a processor couplable to the power-on reset circuit.

REFERENCES:
patent: 4245150 (1981-01-01), Driscoll et al.
patent: 5214316 (1993-05-01), Nagai
patent: 5287011 (1994-02-01), Koshikawa et al.
patent: 5485111 (1996-01-01), Tanimoto
patent: 5581206 (1996-12-01), Chevalier et al.

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