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UM803 - 3-Pin Microprocessor Reset Circuits

General Description

and digital systems.

components and adjustments when used with +5V, +3.3V, +3.0V or +2.5V powered circuits.

Key Features

  • z Computers z Controllers z Portable/Battery-Powered Equipments z Intelligent Instruments z Critical μP and μC Power Monitoring z Automotive z No External Components z Power Supply Transient Immunity z Guaranteed Reset Valid to VCC=+1V z Precision VCC Monitoring of +2.5V, +3V, +3.3V and +5V Supplies z Fully Specified Over Temperature z 2μA Supply Current z 140ms Minimum Power-On Reset Pulse Width z Available in One Output C__o__n__f_i_g__u__r_ation: Open-Drain Active-Low RESET Output z 3-Pin S.

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Datasheet Details

Part number UM803
Manufacturer Union Semiconductor
File Size 251.59 KB
Description 3-Pin Microprocessor Reset Circuits
Datasheet download datasheet UM803 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UM803 3-Pin Microprocessor Reset Circuits UM803 SOT323/SOT23-3 General 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.