Semiconductor integrated circuit with power-on state...

Details Semiconductor integrated circuit with power-on state... Semiconductor integrated circuit with power-on state...

2008-05-27

2008-05-27

Garber, Charles D. (Department: 4125)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S142000, C327S198000

Reexamination Certificate

active

11495735

ABSTRACT:
The present invention is directed to assure an initial state of a circuit until a power supply voltage is stabilized at the time of power-on and to prevent an output circuit of an external input/output buffer circuit from performing erroneous operation at the time of setting a predetermined register value or the like to an initial value. A power supply detecting circuit outputs a power supply voltage detection signal indicating that a power supply voltage supplied from the outside enters a predetermined state. A power on reset circuit receives the power supply voltage detection signal, instructs an initial setting operation of the internal circuit at a predetermined timing and, in response to completion of the initial setting operation of the internal circuit, changes an external input/output buffer circuit from a high impedance state to an operable state. Consequently, when the external input/output buffer circuit becomes operable, the initial setting of the internal circuit has already completed.

REFERENCES:
patent: 2006/0062070 (2006-03-01), Sibigtroth et al.
patent: 2006/0109037 (2006-05-01), Hsu
patent: 2002-111466 (2002-04-01), None
patent: 2004-165732 (2004-06-01), None

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