General Description

The MAX6715–MAX6729 are ultra-low-voltage microproces-

sor (µP) supervisory circuits designed to monitor two or three

system power-supply voltages. These devices assert a sys-

tem 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 sig-

nificantly improve system reliability and reduce size com-

pared to separate ICs or discrete components.

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

options (see 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 correct reset output logic state

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

watchdog input, manual reset input, and power-fail input/out-

put features are available (see Selector Guide). Select reset

timeout periods from 1.1ms to 1120ms (min) (see Reset

Timeout Period Suffix Guide). The MAX6715–MAX6729 are

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

ate over the -40°C to +85°C temperature range.

Applications

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery-Operated Equipment

Industrial Equipment

Printer/Fax

Set-Top Boxes

Features

from 1.58V to 4.63V

Voltages from 0.79V to 3.08V

♦ Externally Adjustable RSTIN Threshold for

Auxiliary/Triple-Voltage Monitoring

(0.62V internal reference)

♦ Watchdog Timer Option

35s (min) Long Startup Period

1.12s (min) Normal Timeout Period

♦ Manual Reset Input Option

♦ Power-Fail Input/Power-Fail Output Option

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

♦ Reset Output Logic Options

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

♦ 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

Typical Operating Circuit

19-2325; Rev 5; 12/05

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 and Selector Guide appear at end of

data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX6715UT_ _D_ -T

-40°C to +85°C

6 SOT23-6

MAX6716UT_ _D_ -T

-40°C to +85°C

6 SOT23-6

MAX6717UK_ _D_ -T

-40°C to +85°C

5 SOT23-5

MAX6718UK_ _D_ -T

-40°C to +85°C

5 SOT23-5

MAX6719UT_ _D_ -T

-40°C to +85°C

6 SOT23-6

MAX6720UT_ _D_ -T

-40°C to +85°C

6 SOT23-6

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

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

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

Ordering Information continued at end of data sheet.