Power-on reset circuit

Details Power-on reset circuit Power-on reset circuit

1991-04-18

1991-12-03

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323316, 323901, G05F 324

Patent

active

050702955

ABSTRACT:
A power-on reset circuit has first and second reference potential circuits and a comparator. The first and second reference potential circuits are such that their output voltage curves with respect to the power supply voltages intersect at a predetermined power supply voltage. The comparator compares output voltages of the first and second reference potential circuits. The first reference potential circuit has a first and a second resistor connected in series and a first non-linear resistor element circuit all connected between a first and a second power supply terminal. A node between the first and second resistors forms an output terminal of the first reference potential circuit. The second reference potential circuit has a third, fourth and fifth resistors connected in series between the first and second power supply terminals and a second non-linear resistor element circuit connected in parallel to the fourth resistor. A node between the third and fourth resistors forms an output terminal of the second reference potential circuit. According to this arrangement, even when the power supply voltage is low, a change in the output voltage of the first reference potential circuit and that in the second reference potential circuit occur on characteristic lines different from each other so that the two output voltages will never become the same voltage.

REFERENCES:
patent: 3867685 (1975-02-01), Ahmed
patent: 3911353 (1975-10-01), van de Plassche
patent: 4087758 (1978-05-01), Hareyama
patent: 4300091 (1981-11-01), Schade, Jr.
patent: 4574232 (1986-03-01), Petty
patent: 4617509 (1986-10-01), Tomisawa
patent: 4673866 (1987-06-01), Masuda
patent: 4692689 (1987-09-01), Takemae
patent: 4788455 (1988-11-01), Mori et al.
patent: 4990846 (1991-02-01), Buck et al.

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