General Description

The MAX6826–MAX6831 are ultra-low-voltage micro-

processor (µP) supervisory circuits designed to monitor

two power supplies and have manual reset and watch-

dog input functions. These devices assert a system reset

if any of the monitored supplies fall below the prepro-

grammed thresholds, and maintain reset for a minimum

timeout period after the supplies rise above the threshold.

Microprocessor supervisors significantly improve system

reliability and accuracy compared to separate ICs or dis-

crete components. These devices monitor primary volt-

ages from +1.8V to +5.0V and secondary voltages from

+0.9V to +2.5V. These devices are guaranteed to be in

A variety of preprogrammed reset threshold voltages

are available (see Threshold Suffix Guide). The devices

include manual reset and watchdog inputs. The

MAX6829/MAX6830/MAX6831 provide a factory-

trimmed threshold to monitor a 2nd voltage down to

+0.9V. The MAX6826/MAX6829 have a push-pull

RESET, the MAX6827/MAX6830 have a push-pull

RESET and the MAX6828/MAX6831 have an open-drain

RESET. The MAX6826/MAX6827/MAX6828 have an aux-

iliary monitor that allows user adjustable input to monitor

voltages down to +0.6V. See Selector Guide for func-

tions available.

________________________Applications

Features

from +0.9V to +2.5V

o User Adjustable RESET IN Down to +0.63V

(MAX6826/MAX6827/MAX6828)

o 140ms (min) Reset Timeout Delay

o 1.6s Watchdog Timeout Period

o Manual Reset Input

o Three Reset Output Options

Push-Pull RESET

Push-Pull RESET

Open-Drain RESET

o No External Components

o Small 6-pin SOT23 Packages

Dual Ultra-Low-Voltage SOT23 µP Supervisors

with Manual Reset and Watchdog Timer

________________________________________________________________ Maxim Integrated Products

1

GND

WDI

MR

16

5

RESET(RESET)

(RESET) MAX6827/MAX6830 ONLY

RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY

MAX6826–

MAX6831

SOT23-6

TOP VIEW

2

34

Pin Configuration

19-1867; Rev 1; 1/02

Ordering Information

Standard Versions Table*

the blanks to complete the part number.

TEMP RANGE

PIN-PACKAGE

MAX6826_UT-T

-40°C to +125°C

6 SOT23-6

MAX6827_UT-T

-40°C to +125°C

6 SOT23-6

MAX6828_UT-T

-40°C to +125°C

6 SOT23-6

MAX6829_ _UT-T

-40°C to +125°C

6 SOT23-6

MAX6830_ _UT-T

-40°C to +125°C

6 SOT23-6

MAX6831_ _UT-T

-40°C to +125°C

6 SOT23-6

MAX6826/MAX6827/MAX6828

L

S

R

Z

V

*Samples are typically available for standard versions only.

The MAX6826/MAX6827/MAX6828 require a 2.5k minimum

order increment for all versions. Contact factory for availability.

Portable/Battery-

Powered Equipment

Embedded Controllers

Intelligent Instruments

Automotive Systems

Critical µP Monitoring

Multivoltage Systems

Typical Operating Circuit appears at end of data sheet.

Threshold Suffix Guide appears at end of data sheet.

Selector Guide appears at end of data sheet.

Standard Versions Table continued at end of data sheet.

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.