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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?
UM809xxP 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/SOT323
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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
UM809AP
VTM
5.00
240
Push-Pull, Active Low
SOT323
UM809BP
VTJ
4.90
240
Push-Pull, Active Low
SOT323
UM809CP
VTK
4.80
240
Push-Pull, Active Low
SOT323
UM809DP
VTN
4.70
240
Push-Pull, Active Low
SOT323
UM809LP
VLY
4.63
240
Push-Pull, Active Low
SOT323
UM809EP
VTQ
4.50
240
Push-Pull, Active Low
SOT323
UM809MP
VMY
4.38
240
Push-Pull, Active Low
SOT323
UM809FP
VTS
4.30
240
Push-Pull, Active Low
SOT323
UM809GP
VTT
4.20
240
Push-Pull, Active Low
SOT323
UM809HP
VSL
4.10
240
Push-Pull, Active Low
SOT323
UM809JP
VJY
4.00
240
Push-Pull, Active Low
SOT323
UM809IP
VSJ
3.90
240
Push-Pull, Active Low
SOT323
UM809KP
VSK
3.80
240
Push-Pull, Active Low
SOT323
UM809NP
VSN
3.70
240
Push-Pull, Active Low
SOT323
UM809OP
VSP
3.60
240
Push-Pull, Active Low
SOT323
UM809PP
VSQ
3.50
240
Push-Pull, Active Low
SOT323
UM809QP
VSR
3.40
240
Push-Pull, Active Low
SOT323
UM809UP
VSS
3.30
240
Push-Pull, Active Low
SOT323
UM809VP
VST
3.20
240
Push-Pull, Active Low
SOT323
UM809TP
VTY
3.08
240
Push-Pull, Active Low
SOT323
UM809WP
VRM
3.00
240
Push-Pull, Active Low
SOT323
UM809SP
VSY
2.93
240
Push-Pull, Active Low
SOT323
UM809XP
VRK
2.80
240
Push-Pull, Active Low
SOT323
UM809YP
VRN
2.70
240
Push-Pull, Active Low
SOT323
UM809RP
VRY
2.63
240
Push-Pull, Active Low
SOT323
UM809AAP
VRQ
2.50
240
Push-Pull, Active Low
SOT323
UM809ABP
VRR
2.40
240
Push-Pull, Active Low
SOT323
UM809ZP
VZY
2.32
240
Push-Pull, Active Low
SOT323
UM809ACP
VRT
2.20
240
Push-Pull, Active Low
SOT323
UM809ADP
VZL
2.10
240
Push-Pull, Active Low
SOT323
UM809AEP
VZM
2.00
240
Push-Pull, Active Low
SOT323
 
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