LMC6953CMX

更新时间： 2024-11-18 22:47:03

品牌	Logo	应用领域
美国国家半导体 - NSC		光电二极管监控 PC
页数	文件大小	规格书
12页	222K
描述
PCI Local Bus Power Supervisor

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LMC6953CMX 数据手册

April 1998

LMC6953

PCI Local Bus Power Supervisor

General Description

Features

n Compliant to PCI specifications revision 2.1.

The LMC6953 is a voltage supervisory chip designed to

meet PCI (Peripheral Component Interconnect) Specifica-

tions Revision 2.1. It monitors 5V and 3.3V power supplies.

In cases of power-up, power-down, brown-out, power failure

and manual reset interrupt, the LMC6953 provides an active

low reset. RESET holds low for 100 ms after both 5V and

3.3V powers recover, or after manual reset signal returns to

high state. The external capacitor on pin 8 adjusts the reset

delay.

n Under and over voltage detectors for 5V and 3.3V

n Power failure detection (5V falling under 3.3V by

300 mV max)

n Manual reset input pin

n Guaranteed RESET assertion at V_DD1.5V

n Integrated reset delay circuitry

n Open drain output

n Adjustable reset delay

n Response time for over and under voltage detection:

490 ns Max

n Power failure response time: 90 ns Max

n Requires minimal external components

This part is ideal on PCI motherboards or add-in cards to en-

sure the integrity of the entire system when there is a fault

condition. The active low reset sets the microprocessor or lo-

cal device in a known state.

The LMC6953 has a built-in bandgap reference that accu-

rately determines all the threshold voltages. The internal re-

set delay circuitry eliminates additional discrete components.

Applications

n Desktop PCs

n PCI-Based Systems

n Network servers

Typical Application Circuits

On Mother Board

On Add-in Cards

DS012846-23

DS012846-24

DS012846

www.national.com

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