Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Reexamination Certificate
2007-07-27
2009-10-13
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
C327S142000, C327S143000
Reexamination Certificate
active
07602225
ABSTRACT:
A power on reset circuit initializes at power on a digital integrated circuit, and includes a first power on reset signal generator powered by an external power supply voltage and generates a first power on reset signal. A reference voltage generator is powered by the external power supply voltage, and is enabled by the first power on reset signal for generating a stable compensating reference voltage. A voltage down converter circuit receives the reference voltage and is enabled by the first power on reset signal, and converts the external applied power supply voltage to a stable regulated internal supply voltage. A second power on reset signal generator circuit receives the regulated internal supply voltage, and is enabled by the first power on reset signal for generating a second power on reset signal for core parts of the digital integrated circuit for initializing them at power on.
REFERENCES:
patent: 4812679 (1989-03-01), Mahabadi
patent: 5519347 (1996-05-01), Kim
patent: 5936443 (1999-08-01), Yasuda et al.
patent: 2002/0031032 (2002-03-01), Ooishi
patent: 2004/057449 (2004-07-01), None
Machine Design, “What to Do When the Power Goes Out”; Apr. 11, 1991; vol. 63, No. 7, Cleveland, Ohio.
Kang Tae-gyoung
Mulatti Jacopo
Seo Donghyun
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Donovan Lincoln
Hynix / Semiconductor Inc.
O'Neill Patrick
STMicroelectronics Asia Pacific Pte. Ltd.
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