Datasheet > UM805SE

UM805SE

更新时间： 2024-11-29 00:59:07

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
14页	379K
描述
Voltage Monitors with Manual Reset Input

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UM805SE 数据手册

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 V_CCsupply voltage

falls below a preset threshold, keeping it asserted for at least 140ms after V_CChas risen above the

reset threshold. Reset thresholds are available for operation with a variety of supply voltages.

The UM805 has an open-drain output stage, while the UM811/812 have push-pull outputs. The

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UM805’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage

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higher than V_CC. The UM805/811 have an active-low RESET output, while the UM812 has an

active-high RESET output. The reset comparator is designed to ignore fast transients on V_CC, and

the outputs are guaranteed to be in the correct logic state for V_CCdown to 1V.

Low supply current makes the UM805/811/812 ideal for use in portable equipments. The devices

come in a 4-pin SOT143 package.

Applications

Features



Computers

Controllers



No External Components

V_CCTransient Immunity

Portable/Battery-Powered Equipments  Correct Logic Output Guaranteed to V_CC=1.0V

Intelligent Instruments

Critical μP and μC Power Monitoring



Precision V_CCMonitoring of 3.0V, 3.3V and 5.0V

Supplies



2μA Supply Current

140ms Minimum Power-On Reset Pulse Width

Guaranteed Over Temperature

Available in 3 Output Configurations:

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Open-Drain Active-Low RESET Output(UM805)

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Push-Pull Active-Low RESET Output(UM811)

Push-Pull Active-High RESET Output(UM812)

4-Pin SOT143 Package



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

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http://www.union-ic.com Rev.01 Jan.2015 1/14

12 3 4 5 6 7...14

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