Semiconductor device and method of supplying internal power...

Details Semiconductor device and method of supplying internal power... Semiconductor device and method of supplying internal power...

2011-04-19

2011-04-19

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

07928777

ABSTRACT:
Provided is a semiconductor device including a step-down circuit group including multiple step-down circuits that step down an external power supply voltage to a predetermined voltage; multiple functional circuits that require a reset operation upon power-on; and a power-on reset circuit that outputs a reset command to the multiple functional circuits, when an internal power supply voltage supplied from the step-down circuit group exceeds a voltage level necessary for an initialization operation. The multiple step-down circuits of the step-down circuit group are classified into a startup operating step-down circuit group that performs a step-down operation from power-on to supply the internal power supply voltage, and a startup non-operating step-down circuit group that stops operation upon power-on to interrupt supply of the internal power supply voltage. The startup non-operating step-down circuit group includes the multiple step-down circuits sequentially selected from one having a shortest wiring distance from the power-on reset circuit.

REFERENCES:
patent: 5936443 (1999-08-01), Yasuda et al.
patent: 7508254 (2009-03-01), Hachiya et al.
patent: 7679412 (2010-03-01), Ogiwara et al.
patent: 7701265 (2010-04-01), Maeda
patent: 09-153777 (1997-06-01), None

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