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UM805 - 4-Pin uP Voltage Monitors

General Description

The UM805/811/812 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.

Key Features

  • z Computers z No External Components z Controllers z VCC Transient Immunity z Portable/Battery-Powered Equipments z Correct Logic Output Guaranteed to VCC=1.0V z Intelligent Instruments z Precision VCC Monitoring of 3.0V, 3.3V and 5.0V z Critical μP and μC Power Monitoring Supplies z 2μA Supply Current z 140ms Minimum Power-On Reset Pulse Width z Guaranteed Over Temperature z Available in 3 Output Con_f_i_g__u_r_a__t_ions: Open-Drain Active-Low___R__E__S__E_ T Output (UM805) Push-Pul.

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Datasheet Details

Part number UM805
Manufacturer Union Semiconductor
File Size 298.51 KB
Description 4-Pin uP Voltage Monitors
Datasheet download datasheet UM805 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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UM805/811/812 4-Pin μP Voltage Monitors with Manual Reset Input UM805/811/812 SOT143 General Description The UM805/811/812 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 UM805/811/812 also provide a debounced manual reset input. These devices perform a single function: They assert a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds are available for operation with a variety of supply voltages.