Power on reset circuit capable of generating power on reset sign

Details Power on reset circuit capable of generating power on reset sign Power on reset circuit capable of generating power on reset sign

1998-03-06

2000-01-18

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327143, 327198, H03L 700

Patent

active

060160683

ABSTRACT:
A power on reset circuit includes: interconnected first and second inverter circuits; a capacitor connected to an input node of the first inverter circuit; and a buffer circuit responsive to voltage at an output node for generating a power on reset signal. In the power on reset circuit, in order to increase source voltage of an N channel MOS transistor in the second inverter circuit to a voltage higher than ground voltage, a diode-connected transistor is inserted between the source of the transistor and a ground node. Thus, the power on reset circuit never fails to produce the power on reset signal even when power supply voltage is dropped.

REFERENCES:
patent: 4196362 (1980-04-01), Maehashi
patent: 5374923 (1994-12-01), Sakamoto
patent: 5442312 (1995-08-01), Walter
patent: 5546045 (1996-08-01), Sauer
patent: 5570050 (1996-10-01), Conary
patent: 5646563 (1997-07-01), Kuo

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