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Date: 6/14/04

SP730 Microprocessor Supervisory Circuit

© Copyright 2004 Sipex Corporation

Microprocessor Supervisory

Circuit with Pull Up Resistor

SP730

DESCRIPTION

FEATURES

■ Holds Microcontroller in Reset

■ Reset Microcontroller during power loss

■ 4.375 Voltage Trip Point

■ Active Low RESET Pin

■ Internal Pull-up Resistor

■ Holds RESET for 350ms (typical)

■ RESET valid down to V

■ 45µA Typical Operating Current

■ Offered in a 3 Pin SOT-23 Package

®

The SP730 is a voltage supervisory device designed to keep a microcontroller in reset until the

system voltage has reached the proper level and stabilized. It also operates as protection from

brown-out conditions when the supply voltage drops below a safe operating level. The SP730

has an internal 5k pull-up resistor. The device has an active low RESET pin and will assert the

RESET signal whenever the voltage on the V

available in a small 3 pin SOT-23 package. Contact factory for other trip voltage options.

TYPICAL APPLICATION CIRCUIT

VDD

SP730

RESET

VDD

Microcontroller

GND

MCLR

RESET

or

Bypass

Capacitor

GND

VDD

SP730

3 Pin SOT-23

RESET

GND

APPLICATIONS

■ Portable Electronic Devices

■ Electrical Power Meter

■ Computer System Board

■ Modem

Now Available in Lead Free Packaging