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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?
UM807xxE μP Reset Circuits with Long Manual Reset Setup Period ACTIVE Open-drain, active LOW 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
UM807LAE
4.63
240
10.08
Open-Drain, Active Low
7LA
SOT143
3000pcs/7Inch
Tape & Reel
UM807MAE
4.38
240
Open-Drain, Active Low
7MA
UM807JAE
4.00
240
Open-Drain, Active Low
7JA
UM807TAE
3.08
240
Open-Drain, Active Low
7TA
UM807SAE
2.93
240
Open-Drain, Active Low
7SA
UM807RAE
2.63
240
Open-Drain, Active Low
7RA
UM807ZAE
2.32
240
Open-Drain, Active Low
7ZA
UM807LBE
4.63
240
6.72
Open-Drain, Active Low
7LB
UM807MBE
4.38
240
Open-Drain, Active Low
7MB
UM807JBE
4.00
240
Open-Drain, Active Low
7JB
UM807TBE
3.08
240
Open-Drain, Active Low
7TB
UM807SBE
2.93
240
Open-Drain, Active Low
7SB
UM807RBE
2.63
240
Open-Drain, Active Low
7RB
UM807ZBE
2.32
240
Open-Drain, Active Low
7ZB
UM807LCE
4.63
240
1.68
Open-Drain, Active Low
7LC
UM807MCE
4.38
240
Open-Drain, Active Low
7MC
UM807JCE
4.00
240
Open-Drain, Active Low
7JC
UM807TCE
3.08
240
Open-Drain, Active Low
7TC
UM807SCE
2.93
240
Open-Drain, Active Low
7SC
UM807RCE
2.63
240
Open-Drain, Active Low
7RC
UM807ZCE
2.32
240
Open-Drain, Active Low
7ZC
 
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