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參數(shù)資料
| 型號： | LP3470M5X-4.38 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Tiny Power On Reset Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 157K |
| 代理商： | LP3470M5X-4.38 |
LP3470
Tiny Power On Reset Circuit
General Description
The LP3470 is a micropower CMOS voltage supervisory cir-
cuit designed to monitor power supplies in microprocessor
(μP) and other digital systems. It provides maximum adjust-
ability for power-on-reset (POR) and supervisory functions. It
is available in the following six standard reset threshold volt-
age (V
) options: 2.63V, 2.93V, 3.08V, 4.00V, 4.38V, and
4.63V. If other voltage options between 2.4V and 5.0V are
desired please contact your National Semiconductor repre-
sentative.
The LP3470 asserts a reset signal whenever the V
supply
voltage falls below a reset threshold. The reset time-out pe-
riod is adjustable using an external capacitor. Reset remains
asserted for an interval (programmed by an external capaci-
tor) after V
CC
has risen above the threshold voltage.
The device is available in the tiny SOT23-5 package.
Key Specifications
n
±
1% Reset Threshold Accuracy Over Temperature
n
Standard Reset Threshold Voltages: 2.63V, 2.93V,
3.08V, 4.00V, 4.38V, and 4.63V
n
Custom Reset Threshold Voltages: For other voltages
between 2.4V and 5.0V contact your National
Semiconductor representative
n
Very Low Quiescent Current (16 μA typical)
n
Guaranteed Reset valid down to V
CC
=0.5V
Features
n
Tiny SOT23-5 Package
n
Open Drain Reset Output
n
Programmable Reset Timeout Period Using an External
Capacitor
n
Immune to Short V
CC
Transients
Applications
n
Critical μP and μC Power Monitoring
n
Intelligent Instruments
n
Computers
n
Portable/Battery-Powered Equipments
Pin Configuration and Basic Operating Circuit
Pin Configuration
DS100016-2
Top View
See NS Package Number
MA05B
Basic Operating Circuit
DS100016-1
June 1999
L
1999 National Semiconductor Corporation
DS100016
www.national.com
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