General Description

The MAX6715A–MAX6729A/MAX6797A are ultra-low-volt-

age microprocessor (µP) supervisory circuits designed to

monitor two or three system power-supply voltages. These

devices assert a system reset if any monitored supply falls

below its factory-trimmed or adjustable threshold and main-

tain reset for a minimum timeout period after all supplies rise

above their thresholds. The integrated dual/triple supervisory

circuits significantly improve system reliability and reduce

size compared to separate ICs or discrete components.

from 0.9V to 3.3V with factory-trimmed reset threshold

voltage options (see the

Reset Voltage Threshold Suffix

Guide). An externally adjustable RSTIN input option

allows customers to monitor a third supply voltage down

to 0.62V. These devices are guaranteed to be in the cor-

remains greater than 0.8V.

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

with watchdog input, manual-reset input, and power-fail

input/output features are available (see the

Selector

Guide). Select reset timeout periods from 1.1ms to

1120ms (min) (see the

Reset Timeout Period Suffix

Guide). The MAX6715A–MAX6729A/MAX6797A are avail-

able in small 5-, 6-, and 8-pin SOT23 packages and oper-

ate over the -40°C to +125°C temperature range.

Applications

Features

from 1.58V to 4.63V

Voltages from 0.79V to 3.08V

o Externally Adjustable RSTIN Threshold for

Auxiliary/Triple-Voltage Monitoring

(0.62V Internal Reference)

o Watchdog Timer Option

35s (min) Long Startup Period

1.12s (min) Normal Timeout Period

o Manual-Reset Input Option

o Power-Fail Input/Power-Fail Output Option

(Push-Pull and Open-Drain Active-Low)

o Reset Output Logic Options

o Low Supply Current 14µA (typ) at 3.6V

o Watchdog Disable Feature

o Small 5-, 6-, and 8-Pin SOT23 Packages

Dual/Triple, Ultra-Low-Voltage, SOT23 µP

Supervisory Circuits

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

IN

OUT2

OUT1

DC-DC

CONVERTER

UNREGULATED

DC

R1

R2

RSTIN/PFI

MR

RST

WDI

PFO

MAX67_ _

PUSHBUTTON

SWITCH

I/O

SUPPLY

CORE

SUPPLY

RESET

I/O

NMI

µP

1.8V

0.9V

MAX6715A-

MAX6729A/

MAX6797A

Typical Operating Circuit

19-0536; Rev 3; 9/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations and Selector Guide appear at end of

data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

MAX6715AUT_ _D_+T

-40°C to +125°C

6 SOT23

MAX6716AUT_ _D_+T

-40°C to +125°C

6 SOT23

MAX6717AUK_ _D_+T

-40°C to +125°C

5 SOT23

MAX6718AUK_ _D_+T

-40°C to +125°C

5 SOT23

MAX6719AUT_ _D_+T

-40°C to +125°C

6 SOT23

MAX6720AUT_ _D_+T

-40°C to +125°C

6 SOT23

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

levels of the devices. Desired threshold levels are set by the part

number suffix found in the Reset Voltage Threshold Suffix Guide.

The “_” after the D is a placeholder for the reset timeout delay

time. Desired delay time is set using the timeout period suffix

found in the Reset Timeout Period Suffix Guide. For example, the

Ordering Information continued at end of data sheet.

+

Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

Multivoltage Systems

Telecom/Networking

Equipment

Computers/Servers

Portable/Battery-

Operated Equipment

Industrial Equipment

Printers/Fax Machines

Set-Top Boxes