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MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer

Maxim Integrated 

MAX6826-MAX6831

Dual Ultra-Low-Voltage SOT23 µP Supervisors

with Manual Reset and Watchdog Timer

General Description

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

cessor (µP) supervisory circuits designed to monitor two

power supplies and have manual reset and watchdog

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

discrete components. These devices monitor primary

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

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

in the correct state for VCC down to +1.0V.

A variety of preprogrammed reset threshold voltages

are available (see the 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

auxiliary monitor that allows user adjustable input to

monitor voltages down to +0.6V. see Selector Guide for

functions available.

Applications

●● Portable/Battery-

Powered Equipment

●● Embedded Controllers

●● Intelligent Instruments

●● Critical µP Monitoring

●● Multivoltage Systems

Pin Configuration

TOP VIEW

RESET(RESET) 1

GND 2

MAX6826–

MAX6831

6 VCC

5 RESET IN/VCC2

MR 3

4 WDI

SOT23-6

(RESET) MAX6827/MAX6830 ONLY

RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY

VCC2 FOR MAX6829/MAX6830/MAX6831 ONLY

Typical Operating Circuit, Threshold Suffix Guide, and

Selector Guide appear at end of data sheet.

Features

●● Monitor Primary VCC Supplies from +1.8V

to +5.0V and Secondary VCC2 Supplies

from +0.9V to +2.5V

●● User Adjustable RESET IN Down to +0.63V

(MAX6826/MAX6827/MAX6828)

●● 140ms (min) Reset Timeout Delay

●● 1.6s Watchdog Timeout Period

●● Manual Reset Input

●● Three Reset Output Options

Push-Pull RESET

Push-Pull RESET

Open-Drain RESET

●● Guaranteed Reset Valid Down to VCC = +1.0V

●● Immune to Short Negative VCC Transients

●● No External Components

●● Small 6-pin SOT23 Packages

Ordering Information

PART†

TEMP RANGE PIN-PACKAGE

MAX6826_UT-T

-40°C to +125°C 6 SOT23

MAX6827_UT-T

-40°C to +125°C 6 SOT23

MAX6828_UT-T

-40°C to +125°C 6 SOT23

MAX6829_ _UT-T -40°C to +125°C 6 SOT23

MAX6830_ _UT-T -40°C to +125°C 6 SOT23

MAX6831_ _UT-T -40°C to +125°C 6 SOT23

†Insert the desired suffix letter (from Standard versions table)

into the blanks to complete the part number.

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

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

Standard Versions Table*

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.

Standard Versions Table continued at end of data sheet.

19-1867; Rev 3; 7/14

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