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UM810ABP Datasheet(PDF) 1 Page - Union Semiconductor, Inc.

Part # UM810ABP
Description  3-Pin Microprocessor Reset Circuits
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Manufacturer  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

UM810ABP Datasheet(HTML) 1 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com
Rev.04 Dec.2013
1/15
UM809/810
3-Pin Microprocessor Reset Circuits
UM809/810 SC70-3/SOT23-3
General Description
The UM809/810 series are ultra low current, cost effective system supervisory circuits designed to
monitor the power supplies in digital systems. They provide a reset signal to the host processor
when necessary, offer excellent circuit reliability & low cost by eliminating external component
and adjustment when used with +5V, +3.3V, +3.0V or other voltage powered circuits.
The reset output is driven active within 10 µs of power supply falling through the reset voltage
threshold. Reset is keeping active for a minimum of 140ms after system power supply has risen
above the reset threshold. Reset threshold suitable for operation with variety of supply voltage are
available.
UM809 has an active-low reset output while UM810 has an active-high reset output. The UM809
/ 810 are optimized to reject fast transient glitches on the power supply line, and the reset output
are guaranteed to be in the correct logic state for power supply VCC down to 1V.
Each of these ICs consists of a voltage reference comparator, resistors for detector threshold
setting, delay generator, output driver & hysteresis circuit. The reset threshold & time delay are
fixed with high accuracy internally and does not require any external adjustment.
Low supply current of 3 µA (VCC=3V) makes UM809/810 ideal for low power application. Both
devices are available in 3 Pin SC70 or SOT23 packages.
Applications
Features
CPU and logic circuit Reset
Power fail detector
Computers
Embedded system
Battery powered equipment
Intelligent instrument
Wide operation voltage range of 1V to 10V
Typical Quiescent current of 3μA
No External components
3-Pin small SC70 and SOT23 packages
VCC Transient immunity
Correct logic output guaranteed to VCC=1.0V
Precision VCC monitor for 2.5V, 3.0V, 3.3V,
and 5.0V supplies
Available in 2 output configurations
Push-pull low active Reset output(UM809)
Push-pull high active Reset output(UM810)
Wide operation Temperature: -40
to 105
℃℃
Pin Configurations
Top View
Top View
Top View
UM809/810
M: Monthly Code
SC70-3/SOT23-3


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