General Description

The MAX6701–MAX6708 microprocessor (µP) supervisory

circuits reduce the complexity and components required

to monitor power-supply functions in µP systems. These

devices significantly improve system reliability and accu-

racy compared to separate ICs or discrete components.

The MAX6701–MAX6708 family provides four functions:

a reset output during power-up, power-down, and

brownout conditions; an independent watchdog output

that goes low if the watchdog input has not been toggled

within 1.6s; a 0.62V threshold detector for power-fail

warning; and an active-low manual reset input.

The MAX6701–MAX6708 family offers several pinout

options to accommodate a variety of multivoltage micro-

processor supervision applications.

The MAX6701(A)/MAX6702(A)/MAX6703(A) monitor

three supply voltages (one fixed threshold and two

adjustable) to drive a single reset output and include a

manual reset input and a watchdog timer with an inde-

pendent output. The MAX6704 monitors a single-supply

voltage to drive complementary reset outputs and

includes an independent adjustable power-fail-in/power-

fail-out comparator, a manual reset input, and a reset-

based watchdog timer. The MAX6705(A)/MAX6706(A)/

MAX6707(A) monitor a single-supply voltage to drive a

single reset output and include an independent

adjustable power-fail-in/power-fail-out comparator, a

manual reset input, and a watchdog timer with an inde-

pendent output. The MAX6708 is the same as the

MAX6704 but without the watchdog timer function.

See the Detailed Description for differences between

non-A and A versions.

Applications

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

White Goods

Networking

Telecommunications

Features

o Small 8-Pin SOT23 Package

o Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V

Supply Voltages

o 140ms Reset Timeout Delay

o Power-Fail Input with Independent Output;

Monitor Inputs Down to 0.62V (MAX6704–MAX6708)

o Dual Adjustable Reset Input for Triple-Voltage

Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A))

o 1.6s Watchdog Timeout Period

(MAX6701(A)–MAX6707(A))

o Independent Watchdog Output

(MAX6701(A)/MAX6702(A)/MAX6703(A)/

MAX6705(A)/MAX6706(A)/MAX6707(A))

o Manual Reset Input

o Four Reset Output Stage Options

Active Low Push-Pull (MAX6701(A), MAX6705(A))

Active Low Open Drain (MAX6703(A), MAX6707(A))

Active High Push-Pull (MAX6702(A), MAX6706(A))

Dual Active Low/High Push-Pull (MAX6704,

MAX6708)

o Low Cost, Few External Components

Low-Voltage, SOT23 µP Supervisors with Power-

Fail In/Out, Manual Reset, and Watchdog Timer

________________________________________________________________ Maxim Integrated Products

1

WDI

RST_IN2

RST_IN1

( ) ARE FOR MAX6702(A) ONLY.

1

2

8

7

WDO

RESET (RESET)

GND

MR

SOT23

TOP VIEW

3

4

6

5

MAX6701(A)

MAX6702(A)

MAX6703(A)

Pin Configurations

Ordering Information

19-1952; Rev 3; 12/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

MAX6701_KA-T

-40°C to +125°C

8 SOT23-8

MAX6701A_KA-T

-40°C to +125°C

8 SOT23-8

Insert the desired suffix letter (from the Threshold Suffix Guide

table) into the blank to complete the part number. All devices

must be ordered in increments of 2500 pieces. Sample stock is

typically held on standard versions only. Contact factory for

availability.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

Ordering Information continued at end of data sheet.

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

Pin Configurations continued at end of data sheet.