LMC6953 datasheet(1/12 Pages) NSC

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LMC6953

PCI Local Bus Power Supervisor

General Description

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.

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.

Features

n

Compliant to PCI specifications revision 2.1.

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

DD = 1.5V

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

Applications

n

Desktop PCs

n

PCI-Based Systems

n

Network servers

Typical Application Circuits

On Mother Board

DS012846-23

On Add-in Cards

DS012846-24

April 1998

DS012846

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Số phần tương tự - LMC6953

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Texas Instruments	LMC6953	944Kb / 19P	LMC6953 PCI Local Bus Power Supervisor
	LMC6953CM/NOPB	944Kb / 19P	LMC6953 PCI Local Bus Power Supervisor
	LMC6953CMX/NOPB	944Kb / 19P	LMC6953 PCI Local Bus Power Supervisor

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