Datasheet > LM3724

LM3724

更新时间： 2024-11-06 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		微处理器复位电路
页数	文件大小	规格书
12页	221K
描述
5-Pin Microprocessor Reset Circuits

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数据手册

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LM3724 数据手册

June 2001

LM3722/LM3723/LM3724

5-Pin Microprocessor Reset Circuits

General Description

Features

n Precise monitoring of 2.5V, 3.3V, and 5V supply

voltages

The LM3722/LM3723/LM3724 microprocessor supervisory

circuits monitor the power supplies in microprocessor and

digital systems. They provide a reset to the microprocessor

during power-up, power-down, brown-out conditions, and

manual reset.

n Fully specified over temperature

Industrial: −40˚C to +85˚C

Extended: −40˚C to +125˚C

n 100 ms minimum Power-On Reset pulse width, 190 ms

typical:

The LM3722/LM3723/LM3724 asserts a reset signal when-

ever the supply decreases below the factory-programmed

reset threshold for at least 100 ms. The reset signal remains

asserted for 190 ms after V_CCrises above the threshold.

Active-Low RESET Output (LM3722)

Active-High RESET Output (LM3723)

Active-Low RESET Open Drain Output (LM3724)

n Guaranteed RESET Output valid for V_CC≥ 1V

n Low Supply Current, 6µA typical

n Power supply transient immunity

n Compatible with MAX811/812 applications

The LM3722 has an active-low RESET push-pull output. The

LM3723 has an active-high RESET push-pull output. The

LM3724 has an active-low open-drain RESET output.

Three standard reset voltage options are available, suitable

for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional

reset voltages are also available; contact National Semicon-

ductor for details.

Applications

n Microprocessor Systems

n Computers

n Controllers

n Intelligent Instruments

n Portable/Battery-Powered Equipment

With

low supply current of only 6µA, the

LM3722/LM3723/LM3724 are ideal for use in portable equip-

ment. The LM3722/LM3723/LM3724 are available in the

5-pin SOT23 package.

Typical Application Circuit

20014401

20014437

Connection Diagram

SOT23-5

20014402

( ) are for LM3723

DS200144

www.national.com

12 3 4 5 6 7...12

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