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UM803
ACTIVE

Key Specifications
Product Description
Features
Applications
Pin Configurations
Ordering Information
Key Specifications
  • Part Number

    UM803

  • Status

    ACTIVE

  • Watchdog

    No

  • Output driver type/Reset outpt

    Open-drain, Active-low

  • Manual Reset Input

    No

  • PFI Option

    No

  • Typical Threshold Voltage (V)

    2.32, 2.63, 2.93, 3.08, 4, 4.38, 4.63

  • VCC Range (V)

    1 to 5.5

  • Iq(typ) (mA)

    0.002

  • Time delay (ms)

    240

  • Features

    3-Pin Microprocessor Reset Circuits

  • Operating Temperature Range (℃)

    -40 to 85

  • Package

    SOT323, SOT23-3

  • Product Description

    The UM803 is a microprocessor (μP) supervisory circuit used to monitor the power supplies in μP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V or +2.5V powered circuits.

    The circuit performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

    The UM803 has an open-drain output stage. The UM803’s open-drain /RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The UM803 has an active-low /RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V.

    Low supply current makes the UM803 ideal for use in portable equipment. The UM803 is available in a 3-pin SOT323 and SOT23 package.

    Features

    - No External Components

    - Power Supply Transient Immunity

    - Guaranteed Reset Valid to VCC=+1V

    - Precision VCC Monitoring of +2.5V, +3V, +3.3V and +5V Supplies

    - Fully Specified Over Temperature

    - 2μA Supply Current

    - 140ms Minimum Power-On Reset Pulse Width

    - Available in One Output Configuration: Open-Drain Active-Low /RESET Output

    - 3-Pin SOT323 and SOT23 Packages

    - Wide Operation Temperature: -40°C to +85°C

    Applications

    - Computers

    - Controllers

    - Portable/Battery-Powered Equipments

    - Intelligent Instruments

    - Critical μP and μC Power Monitoring

    - Automotive

    Pin Configurations
    Ordering Information
    Part NumberPackaging TypeMarking CodeShipping Qty
    UM803xPSOT323VXX3000pcs/7Inch Tape & Reel
    UM803xSSOT23-303X3000pcs/7Inch Tape & Reel
    UM803xSRSOT23-33XX3000pcs/7Inch Tape & Reel