Power-on reset circuit with current detection

Details Power-on reset circuit with current detection Power-on reset circuit with current detection

2006-03-28

2006-03-28

Feild, Lynn (Department: 2835)

Electrical transmission or interconnection systems

Switching systems

Plural switches

C307S125000, C307S130000, C327S143000, C327S198000

Reexamination Certificate

active

07019417

ABSTRACT:
There is provided a power-on reset circuit for generating a power-on reset signal regardless of a power-up slope using not an RC delay method but a current detection method. The power-on reset circuit includes: a power supply voltage sensing node; a power supply voltage detecting unit connected to the power supply voltage sensing node, for detecting a power supply voltage level caused by a difference between a pull-up current and a pull-down current, wherein the power supply voltage detecting unit pulls down the power supply voltage sensing node if the power supply voltage reaches a threshold voltage; and a driving unit connected to the power supply voltage sensing node, for pulling up the sensing node if the power supply voltage is lower than the threshold voltage and buffering a signal of the power supply voltage sensing node to output a power-on reset signal.

REFERENCES:
patent: 5396115 (1995-03-01), Coffman et al.
patent: 5483187 (1996-01-01), Jang
patent: 5517144 (1996-05-01), Nakashima
patent: 6122191 (2000-09-01), Hirose et al.
patent: 6363011 (2002-03-01), Hirose et al.
patent: 6370075 (2002-04-01), Haeberli et al.
patent: 6469552 (2002-10-01), Ohbayashi et al.

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