Semiconductor integrated circuit device with power-on reset...

Details Semiconductor integrated circuit device with power-on reset... Semiconductor integrated circuit device with power-on reset...

2006-06-27

2008-10-21

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S198000

Reexamination Certificate

active

07439782

ABSTRACT:
A semiconductor integrated circuit device operates using a first power supply and a second power supply differing from the first power supply in voltage. The semiconductor integrated circuit device includes a first detecting circuit which detects that the first power supply has exceeded a specific voltage, a second detecting circuit which detects that the second power supply has exceeded a specific voltage, and a check circuit which checks the operating state of an analog circuit carrying out an analog operation using the first power supply and outputs a control signal indicating whether the analog circuit is operating properly. The detecting level of the first detecting circuit is determined on the basis of the control signal. A power-on reset signal is output according to the result of the detection at the first and second detecting circuits.

REFERENCES:
patent: 6087890 (2000-07-01), Kim
patent: 6642757 (2003-11-01), Ikehashi et al.
patent: 6901012 (2005-05-01), Ikehashi et al.
patent: 2005/0140405 (2005-06-01), Do et al.
patent: 2002-100974 (2002-04-01), None

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