FM812R Ver la hoja de datos (PDF) - Fairchild Semiconductor

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FM812R

Microprocessor Reset Circuits

Fairchild Semiconductor 

FM811/812

Microprocessor Reset Circuits

www.fairchildsemi.com

Features

• Feature

• Precision Voltage Monitor for 3V, 3.3V or 5V Power

Supplies

• 6µA Supply Current

• 140ms Minimum Reset Pulse Width

• RESET Remains Valid with VCC as Low as 1.4V

• Active Low Manual Reset Input

• No External Components

• 4-Pin SOT-143 Package

Applications

• Critical Microprocessor Power Monitoring

• Portable Equipment

• Intelligent Instruments

• Computers & Printers

• Controllers

Typical Applications

Description

The FM811/FM812 is a low cost microprocessor supervisory

circuit that asserts a reset if the power supply drops below a

designated threshold or the manual reset pin is forced low.

Several different reset thresholds are available to

accommodate systems operating at 3V, 3.3V or 5V.

The FM811 has an active low RESET output, while the

FM812 offers an active high RESET output. The reset output

is guaranteed to remain asserted for a minimum of 140ms

after VCC has risen above the designated reset threshold.

The FM811/FM812 is available in a 4-pin SOT-143.

VCC

VCC

FM811

FM812

RESET

(RESET)

MR

VCC

µP

RESET

INPUT

( ) = FM812

PRELIMINARY INFORMATION describes products that are in the design stage. Specifications may change

in any manner whatever without notice. Contact Fairchild Semiconductor for current information.

REV. 1.5.1 7/15/02

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