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Key Specifications
Part Number Description Status Reset Out treset (min) Watchdog Feature Watchdog Timeout Manual Reset Power Fail Comparator Reset Thresh. Accur. (@ +25°C) (%) Icc (max) (µA) RoHS Available Oper. Temp. (°C) Pin/Package EV Kit Available?
UM809xxS 3-Pin, Low-Power μP Reset Circuit with Push-Pull /RESET ACTIVE Push-pull, active LOW 140ms No No No 2.5 5 Yes -40 to 85 3/SOT23
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Product 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 10µs 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 3µA (VCC=3V) makes UM809/810 ideal for low power application. Both devices are available in 3 Pin SOT323 or SOT23 packages.
 
Features
 
- Wide Operation Voltage Range of 1V to 10V
- Typical Quiescent Current of 3μA
- No External Components
- 3-Pin Small SOT323 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°C to +85°C
 
Typical Application Circuit

                            
 
Applications
 
- CPU and Logic Circuit Reset
- Power Fail Detectors
- Computers
- Embedded Systems
- Battery-Powered Equipments
- Intelligent Instruments
 
Pin Configurations  

                            
 
Ordering Information
 
UM8 XX ZZ P
XX: Output Type
=09 Push-Pull Active Low
=10 Push-Pull Active High
ZZ: Reset Threshold (V)
P: Package Type
=S SOT23-3
=P SOT323

Selection Table
 
Part Number
Top Marking
RESET Threshold (V)
Timeout Period (ms)
Output Type
Package Type
UM809AS
6E2
5.00
240
Push-Pull, Active Low
SOT23-3
UM809BS
6E3
4.90
240
Push-Pull, Active Low
SOT23-3
UM809CS
6E4
4.80
240
Push-Pull, Active Low
SOT23-3
UM809DS
6E5
4.70
240
Push-Pull, Active Low
SOT23-3
UM809LS
09L
4.63
240
Push-Pull, Active Low
SOT23-3
UM809ES
6E7
4.50
240
Push-Pull, Active Low
SOT23-3
UM809MS
09M
4.38
240
Push-Pull, Active Low
SOT23-3
UM809FS
6E9
4.30
240
Push-Pull, Active Low
SOT23-3
UM809GS
6EA
4.20
240
Push-Pull, Active Low
SOT23-3
UM809HS
6EB
4.10
240
Push-Pull, Active Low
SOT23-3
UM809JS
09J
4.00
240
Push-Pull, Active Low
SOT23-3
UM809IS
6ED
3.90
240
Push-Pull, Active Low
SOT23-3
UM809KS
6EE
3.80
240
Push-Pull, Active Low
SOT23-3
UM809NS
6EF
3.70
240
Push-Pull, Active Low
SOT23-3
UM809OS
6EH
3.60
240
Push-Pull, Active Low
SOT23-3
UM809PS
6EL
3.50
240
Push-Pull, Active Low
SOT23-3
UM809QS
6EM
3.40
240
Push-Pull, Active Low
SOT23-3
UM809US
6EJ
3.30
240
Push-Pull, Active Low
SOT23-3
UM809VS
6EK
3.20
240
Push-Pull, Active Low
SOT23-3
UM809TS
09T
3.08
240
Push-Pull, Active Low
SOT23-3
UM809WS
6EP
3.00
240
Push-Pull, Active Low
SOT23-3
UM809SS
09S
2.93
240
Push-Pull, Active Low
SOT23-3
UM809XS
6ER
2.80
240
Push-Pull, Active Low
SOT23-3
UM809YS
6ES
2.70
240
Push-Pull, Active Low
SOT23-3
UM809RS
09R
2.63
240
Push-Pull, Active Low
SOT23-3
UM809AAS
6EY
2.50
240
Push-Pull, Active Low
SOT23-3
UM809ABS
6EU
2.40
240
Push-Pull, Active Low
SOT23-3
UM809ZS
09Z
2.32
240
Push-Pull, Active Low
SOT23-3
UM809ACS
6F5
2.20
240
Push-Pull, Active Low
SOT23-3
UM809ADS
6F6
2.10
240
Push-Pull, Active Low
SOT23-3
UM809AES
6F7
2.00
240
Push-Pull, Active Low
SOT23-3
 
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