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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?
UM810xxS 3-Pin, Low-Power μP Reset Circuit with Push-Pull RESET ACTIVE Push-pull, active HIGH 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
UM810AS
5E2
5.00
240
Push-Pull, Active High
SOT23-3
UM810BS
5E3
4.90
240
Push-Pull, Active High
SOT23-3
UM810CS
5E4
4.80
240
Push-Pull, Active High
SOT23-3
UM810DS
5E5
4.70
240
Push-Pull, Active High
SOT23-3
UM810LS
10L
4.63
240
Push-Pull, Active High
SOT23-3
UM810ES
5E7
4.50
240
Push-Pull, Active High
SOT23-3
UM810MS
10M
4.38
240
Push-Pull, Active High
SOT23-3
UM810FS
5E9
4.30
240
Push-Pull, Active High
SOT23-3
UM810GS
5BA
4.20
240
Push-Pull, Active High
SOT23-3
UM810HS
5BB
4.10
240
Push-Pull, Active High
SOT23-3
UM810JS
10J
4.00
240
Push-Pull, Active High
SOT23-3
UM810IS
5BD
3.90
240
Push-Pull, Active High
SOT23-3
UM810KS
5BE
3.80
240
Push-Pull, Active High
SOT23-3
UM810NS
5BF
3.70
240
Push-Pull, Active High
SOT23-3
UM810OS
5BH
3.60
240
Push-Pull, Active High
SOT23-3
UM810PS
5BL
3.50
240
Push-Pull, Active High
SOT23-3
UM810QS
5BM
3.40
240
Push-Pull, Active High
SOT23-3
UM810US
5BJ
3.30
240
Push-Pull, Active High
SOT23-3
UM810VS
5BK
3.20
240
Push-Pull, Active High
SOT23-3
UM810TS
10T
3.08
240
Push-Pull, Active High
SOT23-3
UM810WS
5BP
3.00
240
Push-Pull, Active High
SOT23-3
UM810SS
10S
2.93
240
Push-Pull, Active High
SOT23-3
UM810XS
5BR
2.80
240
Push-Pull, Active High
SOT23-3
UM810YS
5BS
2.70
240
Push-Pull, Active High
SOT23-3
UM810RS
10R
2.63
240
Push-Pull, Active High
SOT23-3
UM810AAS
5BY
2.50
240
Push-Pull, Active High
SOT23-3
UM810ABS
5BU
2.40
240
Push-Pull, Active High
SOT23-3
UM810ZS
10Z
2.32
240
Push-Pull, Active High
SOT23-3
UM810ACS
5F5
2.20
240
Push-Pull, Active High
SOT23-3
UM810ADS
5F6
2.10
240
Push-Pull, Active High
SOT23-3
UM810AES
5F7
2.00
240
Push-Pull, Active High
SOT23-3
 
 
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