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Datasheet Reliability Report Package Information Order Sample  
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?
UM822xxE μP Reset Circuits with Long Manual Reset Setup Period ACTIVE Push-pull, active HIGH 140ms No Yes No 2.5 5 Yes -40 to 85 4/SOT143 Y
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Product Description
 
The UM807/821/822 are low-power microprocessor (μP) supervisory circuits used to monitor power supplies in μP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits. The UM807/821/822 also provide a debounced manual reset input with long setup period.
On all devices, the reset output asserts when the VCC supply voltage drops below its specified threshold. The reset output remains asserted for the reset timeout period (240ms typ) after VCC rises above the reset threshold. The reset output is one-shot pulse asserted for the reset timeout period (140ms min) when manual reset input is held low for a fixed setup timeout period. These devices ignore manual reset transitions of less than the fixed setup timeout period.
The UM807 has an active-low RESET(_______________) with open-drain output, the UM821 has an active-low RESET(_______________) with push-pull output, and the UM822 has an active-high RESET with push-pull output. These devices, offered in small SOT143 package, are fully guaranteed over the extended temperature range (-40°C to +85°C).
 
Features
 
- No External Components
- VCC Transient Immunity
- Correct Logic Output Guaranteed to VCC=1.0V
- Precision VCC Monitoring of 3.0V, 3.3V and 5.0V Supplies
- 2μA Supply Current
- 140ms Minimum Power-On Reset Pulse Width
- Available in 3 Manual Reset Setup Periods (tMR):
  A: 10.08s
  B: 6.72s
  C: 1.68s
- Available in 3 Output Configurations:
  Open-Drain Active-Low RESET(_______________) Output(UM807);
  Push-Pull Active-Low RESET(_______________) Output(UM821)
  Push-Pull Active-High RESET Output(UM822)
- 4-Pin SOT143 Package
- Wide Operation Temperature: -40°C to +85°C
 
Typical Application Circuit

 
 
Applications
 
- Set-Top Boxes
- Consumer Electronics
- DVD Players
- Cable/DSL Modems
- MP3 Players
- Industrial Equipments
- Automotive
- Medical Devices
 
Pin Configurations  
 
               
( ) are for UM822
 
Ordering Information
 
UM8 XX Z T P
XX: Output Type
=07   Open-Drain Active Low
=21   Push-Pull Active Low
=22   Push-Pull Active High
Z: Reset Threshold (V)
=L     4.63
=M    4.38
=J     4.00
=T     3.08
=S     2.93
=R     2.63
=Z     2.32
T: Manual Reset Setup Period (s)
=A     10.08
=B     6.72
=C     1.68
P: Package Type
=E     SOT143
 
Selection Table
 
Part Number
RESET Threshold (V)
Timeout Period (ms)
Manual Reset Setup Period (s)
Output Type
Marking Code
Package Type
Shipping Qty
UM822LAE
4.63
240
10.08
Push-Pull, Active High
2LA
SOT143
3000pcs/7Inch
Tape & Reel
UM822MAE
4.38
240
Push-Pull, Active High
2MA
UM822JAE
4.00
240
Push-Pull, Active High
2JA
UM822TAE
3.08
240
Push-Pull, Active High
2TA
UM822SAE
2.93
240
Push-Pull, Active High
2SA
UM822RAE
2.63
240
Push-Pull, Active High
2RA
UM822ZAE
2.32
240
Push-Pull, Active High
2ZA
UM822LBE
4.63
240
6.72
Push-Pull, Active High
2LB
UM822MBE
4.38
240
Push-Pull, Active High
2MB
UM822JBE
4.00
240
Push-Pull, Active High
2JB
UM822TBE
3.08
240
Push-Pull, Active High
2TB
UM822SBE
2.93
240
Push-Pull, Active High
2SB
UM822RBE
2.63
240
Push-Pull, Active High
2RB
UM822ZBE
2.32
240
Push-Pull, Active High
2ZB
UM822LCE
4.63
240
1.68
Push-Pull, Active High
2LC
UM822MCE
4.38
240
Push-Pull, Active High
2MC
UM822JCE
4.00
240
Push-Pull, Active High
2JC
UM822TCE
3.08
240
Push-Pull, Active High
2TC
UM822SCE
2.93
240
Push-Pull, Active High
2SC
UM822RCE
2.63
240
Push-Pull, Active High
2RC
UM822ZCE
2.32
240
Push-Pull, Active High
2ZC
 
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