General Description

The MAX6832–MAX6840 are microprocessor (µP)

supervisory circuits used to monitor low-voltage power

supplies in µP and digital systems. They provide excel-

lent circuit reliability and low cost by eliminating exter-

nal components and adjustments when used with

+1.2V to +1.8V powered circuits.

supply voltage declines below a preset threshold or

whenever manual reset (MR) is asserted. Reset remains

above the reset threshold or when manual reset is

deasserted. Five different timeout periods are available:

70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.

Reset thresholds suitable for operation with a variety of

supply voltages are available.

The MAX6832/MAX6835/MAX6838 have a push-pull

active-low reset output (RESET). The MAX6833/

MAX6836/MAX6839 have a push-pull active-high reset

output (RESET) and the MAX6834/MAX6837/MAX6840

have an open-drain active-low reset output (RESET). The

open-drain active-low reset output requires a pullup resis-

The MAX6835/MAX6836/MAX6837 feature a debounced

manual reset input (MR), while the MAX6838/MAX6839/

MAX6840 provide a RESET-IN input allowing the user to

externally adjust the reset threshold. The reset compara-

Low supply current of 7.5µA makes the MAX6832–

MAX6840 ideal for use in portable equipment. These

devices are available in 3- and 4-pin SC70 packages.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Features

o Factory-Set Reset Threshold Voltages for

Nominal Supplies from 1.2V to 1.8V

o Low Power Consumption: 7.5µA (typ)

o Space-Saving 3- and 4-Pin SC70 Packages

o ±2.5% Reset Threshold Accuracy Over

Temperature

o Five Different Timeout Periods Available: 70µs

(voltage detector), 1.5ms, 30ms, 210ms, and 1.68s

o Three Reset Output Configurations

Push-Pull RESET

Push-Pull RESET

Open-Drain RESET

0.55V—Active-Low

0.75V—Active-High

o Adjustable Threshold Reset-In Option

o Manual Reset Input Option

o Pin Compatible with MAX803/MAX809/MAX810,

MAX6711/MAX6712/MAX6713, and

MAX6381–MAX6390 Series

Ultra-Low-Voltage SC70 Voltage Detectors

and µP Reset Circuits

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2242; Rev 1; 1/02

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.

Pin Configurations appear at end of data sheet.

Typical Operating Circuit apears at end of data sheet.

Selector Guide appears at end of data sheet.

PART

TEMP. RANGE

PIN-PACKAGE

MAX6832_XRD_-T

-40

°C to +85°C

3 SC70-3

MAX6833_XRD_-T

-40

°C to +85°C

3 SC70-3

MAX6834_XRD_-T

-40

°C to +85°C

3 SC70-3

MAX6835_XSD_-T

-40

°C to +85°C

4 SC70-4

MAX6836_XSD_-T

-40

°C to +85°C

4 SC70-4

MAX6837_XSD_-T

-40

°C to +85°C

4 SC70-4

MAX6838XSD_-T

-40

°C to +85°C

4 SC70-4

MAX6839XSD_-T

-40

°C to +85°C

4 SC70-4

MAX6840XSD_-T

-40

°C to +85°C

4 SC70-4

Insert the desired suffix letter from the Threshold Suffix Guide

(MAX6832–MAX6837) and the Active Timeout Period Guide

tables into the blanks to complete the part number. Sample

stock is generally available on standard versions only (see

Standard Versions table). Standard versions require a minimum

order increment of 2.5k units. Nonstandard versions must be

ordered in 10k unit increments. Contact factory for availability.

All parts are offered in tape-and-reel only.