Home > Products > Power Management > μP Supervisory
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?
UM825xS Voltage Supervisory Circuits with Manual Reset Input ACTIVE Push-pull, active HIGH/LOW 140ms No Yes No 2.5 0 Yes -40 to 85 5/SOT23 Y
View All>> Product Description
The UM823/824/825 series are cost effective system power supply supervisory circuits designed to monitor the power supplies in digital systems. This family provides circuit initialization and timing supervision. Independent watchdog monitoring circuitry and manual reset input are included. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.
The UM823/824/825 are specifically designed to ignore fast transients on VCC. Seven preprogrammed reset threshold voltages are available. All three devices have an active-low reset output, which is guaranteed to be in the correct state for VCC down to 1V. The UM823 also offers a watchdog input and manual reset input. The UM824 offers a watchdog input and a complementary active-high reset. The UM825 offers a manual reset input and a complementary active-high reset.
- Wide Operation Voltage Range of 1V to 5.5V
- Correct Logic Output Guaranteed to VCC=1.0V
- Precision Supply-Voltage Monitor: 2.19V, 2.63V, 2.93V, 3.08V, 4.38V, 4.63V
- 200ms Reset Pulse Width
- Independent Watchdog Timer-1.6s Timeout 
- Power Supply Transient Immunity
- Temperature Range: -40°C to +85°C
- Supply Current 
  4uA for L/M
  3uA for T/S/R/Z/Y
Typical Application Circuit

- Applications Using DSPs, Microcontrollers or Microprocessors
- Programmable Controls
- Computers
- Embedded Systems
- Industrial Equipments
- Intelligent Instruments
- Wireless Communications Systems
Pin Configurations   

Ordering Information

@2014 Union Semiconductor Limited. All rights Reserved. 沪ICP备09013408