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UIC809G-X-AE2-3-R Datasheet(PDF) 5 Page - Unisonic Technologies

Part # UIC809G-X-AE2-3-R
Description  MICROPROCESSOR RESET CIRCUITS
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UIC809G-X-AE2-3-R Datasheet(HTML) 5 Page - Unisonic Technologies

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UNISONIC TECHNOLOGIES CO., LTD
UIC809
CMOS IC
www.unisonic.com.tw
5 of 8
Copyright © 2014 Unisonic Technologies Co., Ltd
QW-R119-024.A
TYPICAL APPLICATION CIRCUIT
UTC
UIC809
VCC
RESET
µP
VCC
RESET
VCC
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 4.7kΩ resistor 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 100kΩ can 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.


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