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PDF UIC809 Data sheet ( Hoja de datos )

Número de pieza UIC809
Descripción MICROPROCESSOR RESET CIRCUITS
Fabricantes Unisonic Technologies 
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No Preview Available ! UIC809 Hoja de datos, Descripción, Manual

UNISONIC TECHNOLOGIES CO., LTD
UIC809
MICROPROCESSOR RESET
CIRCUITS
CMOS IC
DESCRIPTION
The UTC UIC809 series are resetting circuits which can monitor
power supplies especially in microprocessor based systems.
In normal operation, the UTC UIC809 series can assert a reset
under any of the following situation: the power supply drops below a
designated reset threshold level (which is available for 3V or 3.3V or
5V system) is forced low.
There is an internal active low RESET output which has already
been guaranteed to remain asserted for at 140ms least while VCC
rises above the designed threshold level.
FEATURES
* Voltage monitor for 3V or 3.3V or 5V power supplies
* Valid RESET remains with VCC as low as 1V
* Typical supply current: 5µA
* Fixed 140ms minimum reset pulse width
* With Manual reset input
ORDERING INFORMATION
Ordering Number
Package
Pin Assignment
12
UIC809G-x-AE2-3-R
SOT-23-3 RESET
GND
Note: Pin Assignment : x: Output Voltage, refer to Marking Information.
3
VCC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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UIC809 pdf
UNISONIC TECHNOLOGIES CO., LTD
UIC809
TYPICAL APPLICATION CIRCUIT
VCC
VCC
UTC
UIC809
RESET
VCC
µP
RESET
CMOS IC
APPLICATION INFORMATION
Microprocessor Reset
As soon as VCC falls below the reset threshold voltage, the RESET pin is asserted. But the RESET pin can
keep asserted for a period of 140ms after VCC rose above the reset threshold voltage. After a power failure the reset
operation can keep the processor being reset and powers up properly.
VCC Transients
The UTC UIC809 series won’t cause a reset typically as this situation: a negative-going transient 125mV below
the reset threshold with a duration of 20µs or less.
Interfacing to Bidirectional Reset Pins
Connecting a 4.7kresistor in series with the UTC UIC809 series output and the µP reset pin can make the UTC
UIC809 series interface with µPs with bidirectional reset pins.
RESET Valid at Low Voltage
As the figure below, adding a resistor which is recommended 100kcan ensure the RESET output remains low
with VCC down to 0V. The size of the resistor should be not too large which will load the output excessively and not too
small which can pull-down any stray leakage currents.
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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QW-R119-024.A

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