Datasheet > UM821LAE

UM821LAE

更新时间： 2024-11-05 00:44:31

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
17页	414K
描述
Reset Circuits with Long Manual Reset Setup Period

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UM821LAE 数据手册

UM807/821/822

μP Reset Circuits with Long Manual Reset Setup Period

UM807/821/822 SOT143

General Description

The UM807/821/822 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 UM807/821/822 also provide a debounced manual reset input with long setup period.

On all devices, the reset output asserts when the V_CCsupply voltage drops below its specified

threshold. The reset output remains asserted for the reset timeout period (240ms typ) after V_CCrises

above the reset threshold. The reset output is one-shot pulse asserted for the reset timeout period

(140ms min) when manual reset input is held low for a fixed setup timeout period. These devices

ignore manual reset transitions of less than the fixed setup timeout period.

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The UM807 has an active-low RESET with open-drain output, the UM821 has an active-low

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RESET with push-pull output, and the UM822 has an active-high RESET with push-pull output.

These devices, offered in small SOT143 package, are fully guaranteed over the extended

temperature range (-40°C to +85°C).

Applications

Features



Set-Top Boxes

Consumer Electronics

DVD Players

Cable/DSL Modems

MP3 Players

Industrial Equipments

Automotive



No External Components

V_CCTransient Immunity

Correct Logic Output Guaranteed to V_CC=1.0V

Precision V_CCMonitoring of 3.0V, 3.3V and 5.0V

Supplies

2μA Supply Current

140ms Minimum Power-On Reset Pulse Width

Available in 3 Manual Reset Setup Periods (t_MR):



Medical Devices

A: 10.08s

B: 6.72s

C: 1.68s



Available in 3 Output Configurations:

__________

Open-Drain Active-Low RESET Output(UM807);

__________

Push-Pull Active-Low RESET Output(UM821)

Push-Pull Active-High RESET Output(UM822)

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 1/17

12 3 4 5 6 7...17

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