Datasheet > UM803MS

UM803MS

更新时间： 2024-11-29 00:49:31

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
11页	332K
描述
3-Pin Microprocessor Reset Circuits

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UM803MS 数据手册

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 V_CCsupply voltage

declines below a preset threshold, keeping it asserted for at least 140ms after V_CChas 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 V_CC. The UM803 has an active-low

_____________

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 UM803 ideal for use in portable equipment. The UM803 is available

in a 3-pin SOT323 and SOT23 package.

Applications

Features



Computers

Controllers



No External Components

Power Supply Transient Immunity

Portable/Battery-Powered Equipments  Guaranteed Reset Valid to V_CC=+1V

Intelligent Instruments

Critical μP and μC Power Monitoring

Automotive



Precision V_CCMonitoring 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



Pin Configurations

Top View

GND

XXX

3 VCC

Marking Pin1

RESET 2

M: Month Code

UM803

SOT323/SOT23-3

________________________________________________________________________

http://www.union-ic.com Rev.01 Jan.2015 1/11

12 3 4 5 6 7...11

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