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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?
UM810xxP 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/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
UM810AP
ZTM
5.00
240
Push-Pull, Active High
SOT323
UM810BP
ZTJ
4.90
240
Push-Pull, Active High
SOT323
UM810CP
ZTK
4.80
240
Push-Pull, Active High
SOT323
UM810DP
ZTN
4.70
240
Push-Pull, Active High
SOT323
UM810LP
ZLY
4.63
240
Push-Pull, Active High
SOT323
UM810EP
ZTQ
4.50
240
Push-Pull, Active High
SOT323
UM810MP
ZMY
4.38
240
Push-Pull, Active High
SOT323
UM810FP
ZTS
4.30
240
Push-Pull, Active High
SOT323
UM810GP
ZTT
4.20
240
Push-Pull, Active High
SOT323
UM810HP
ZSL
4.10
240
Push-Pull, Active High
SOT323
UM810JP
ZJY
4.00
240
Push-Pull, Active High
SOT323
UM810IP
ZSJ
3.90
240
Push-Pull, Active High
SOT323
UM810KP
ZSK
3.80
240
Push-Pull, Active High
SOT323
UM810NP
ZSN
3.70
240
Push-Pull, Active High
SOT323
UM810OP
ZSP
3.60
240
Push-Pull, Active High
SOT323
UM810PP
ZSQ
3.50
240
Push-Pull, Active High
SOT323
UM810QP
ZSR
3.40
240
Push-Pull, Active High
SOT323
UM810UP
ZSS
3.30
240
Push-Pull, Active High
SOT323
UM810VP
ZST
3.20
240
Push-Pull, Active High
SOT323
UM810TP
ZTY
3.08
240
Push-Pull, Active High
SOT323
UM810WP
ZRM
3.00
240
Push-Pull, Active High
SOT323
UM810SP
ZSY
2.93
240
Push-Pull, Active High
SOT323
UM810XP
ZRK
2.80
240
Push-Pull, Active High
SOT323
UM810YP
ZRN
2.70
240
Push-Pull, Active High
SOT323
UM810RP
ZRY
2.63
240
Push-Pull, Active High
SOT323
UM810AAP
ZRQ
2.50
240
Push-Pull, Active High
SOT323
UM810ABP
ZRR
2.40
240
Push-Pull, Active High
SOT323
UM810ZP
ZZY
2.32
240
Push-Pull, Active High
SOT323
UM810ACP
ZRT
2.20
240
Push-Pull, Active High
SOT323
UM810ADP
ZZL
2.10
240
Push-Pull, Active High
SOT323
UM810AEP
ZZM
2.00
240
Push-Pull, Active High
SOT323
 
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