General Description

The MAX6736–MAX6745 are low-power dual-/triple-

voltage microprocessor (µP) supervisors. These

devices assert a reset if any monitored supply falls

below its factory-trimmed or adjustable threshold and

maintain reset for a minimum timeout period after all

supplies rise above their thresholds. The integrated

dual/triple supervisory circuits significantly reduce size

and power compared to separate ICs or discrete com-

ponents. The low supply current of 6µA makes these

devices ideal for portable equipment.

The MAX6736/MAX6737 are dual fixed-voltage µP

supervisors with a manual reset input. The MAX6738/

MAX6739 have one fixed and one adjustable reset

threshold and a manual reset input. The MAX6740/

MAX6743 are triple-voltage µP supervisors with two

fixed and one user-adjustable reset threshold inputs.

The MAX6741/MAX6744 are dual-voltage µP supervi-

sors with a power-OK (POK) output ideal for power-

supply sequencing. The MAX6742/MAX6745 monitor

power-fail comparator.

The MAX6736–MAX6745 monitor I/O supply voltages

threshold voltage options (Table 1). An external

adjustable RSTIN input option allows monitoring volt-

ages down to 0.5V.

A variety of push-pull or open-drain reset outputs along

with manual reset input and power-fail input/output fea-

tures are available (see the Selector Guide). The

MAX6736–MAX6745 are offered in a space-saving 5-pin

SC70 package and operate over the -40°C to +85°C

temperature range.

Applications

Features

o Dual-/Triple-Supply Reset Voltage Monitors

o Precision Factory-Set Reset Thresholds for

Monitoring from 0.9V to 5.0V

o Adjustable Reset Input Down to 0.488V

o 150ms and 1200ms (min) Reset Timeout Period

Options

Sequencing Applications (MAX6741/MAX6744)

o Power-Fail Input/Power-Fail Output

(MAX6742/MAX6745)

o 6µA Supply Current

o Tiny SC70 Package

Low-Power Dual-/Triple-Voltage SC70 µP

Supervisory Circuits

________________________________________________________________ Maxim Integrated Products

1

PART

VOLTAGE

MONITORS

OPEN-DRAIN

RESET

PUSH-PULL

RESET

MANUAL

RESET

POWER-FAIL

INPUT/

OUTPUT

POK

OUTPUT

RSTIN

INPUT

MAX6736

2 fixed

X

—

X

——

—

MAX6737

2 fixed

—

XX

——

—

MAX6738

1 fixed, 1 adj

X

—

X

——

X

Selector Guide

Ordering Information

19-2531; Rev 1; 4/03

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

MAX6736XK_ _D_-T

-40°C to +85°C

5 SC70-5

MAX6737XK_ _D_-T

-40°C to +85°C

5 SC70-5

Note: The first “_ _” or “_” are placeholders for the threshold

voltage levels of the devices. Desired threshold levels are set

by the part number suffix found in Tables 1 and 2. The “_” after

the D is a placeholder for the reset timeout period suffix found

in Table 3. For example, the MAX6736XKLTD3-T is a dual-volt-

minimum reset timeout period. All devices are available in

tape-and-reel only. There is a 2500-piece minimum order

increment for standard versions (see Table 1). Sample stock is

typically held on standard versions only. Nonstandard versions

require a minimum order increment of 10,000 pieces. Contact

factory for availability.

Portable/Battery-

Powered Equipment

Multivoltage Systems

Notebook Computers

Controllers

PDAs

GPS Equipment

POS Equipment

Ordering Information continued at end of data sheet.

Selector Guide continued at end of data sheet.

Pin Configurations appear at end of data sheet.

Typical Application Circuits appear at end of data sheet.

Functional Diagram appears at end of data sheet.

*Manual reset detect on

RESET output.