General Description

The MAX6467/MAX6468 microprocessor (µP) supervi-

sory circuits monitor single power-supply voltages from

+1.8V to +5.0V and assert a reset if the supply voltage

drops below its preset threshold. An edge-triggered,

one-shot manual reset function ensures that the µP

enters the reset mode for a fixed timeout period only,

even in the event of a continuously asserted manual

reset. The MAX6467/MAX6468 significantly improve

system reliability compared to traditional manual reset

supervisory circuits.

A variety of factory-trimmed threshold options accommo-

date different supply voltages and tolerances, eliminating

external components. The factory-set thresholds range

from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,

+2.5V, and +1.8V supplies with various tolerances. Reset

timeout periods of 150ms (min) and 1200ms (min) are

available to accommodate different µP platforms.

drops below its threshold or if the edge-triggered MR

asserts low. RESET remains low for the reset timeout

one-shot timeout period after a manual reset input falling

above +1V. Open-drain (MAX6467) and push-pull

(MAX6468) output options provide additional flexibility in

the system design.

The MAX6467/MAX6468 are offered in the space-saving

4-pin SOT143 package and the ultra-small 4-pin SC70

package and are specified over the automotive (-40°C to

+125°C) temperature range.

Applications

Cell Phones/PDAs

Embedded Control Systems

Industrial Equipment

Automotive Products

Portable/Battery-Powered Equipment

Medical Devices

DSL Modems

MP3 Players

GPS Systems

Digital Cameras

Features

o Precision Factory-Set Reset Threshold Voltages

for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies

o Edge-Triggered Manual Reset Input with One-

Shot Pulsed Reset Output

o Two Reset Timeout Period Options (150ms or

1200ms min)

o Immune to Short Voltage Transients

o Active-Low Open-Drain and Push-Pull RESET

Output Options

o -40°C to +125°C Operating Temperature Range

o Small 4-Pin SC70 and SOT143 Packages

o No External Components Required

o Pin Compatible with MAX811, MAX6315,

MAX6384, and MAX6386

Microprocessor Supervisory Reset Circuits

with Edge-Triggered, One-Shot Manual Reset

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2523; Rev 0; 7/02

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.

Typical Operating Circuit appears at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX6467XS_ _D_-T

-40°C to +125°C

4 SC70-4

MAX6467US_ _D_-T

-40°C to +125°C

4 SOT143-4

MAX6468XS_ _D_-T

-40°C to +125°C

4 SC70-4

MAX6468US_ _D_-T

-40°C to +125°C

4 SOT143-4

Note: Insert reset threshold suffix (see Reset Threshold table)

after XS or US. Insert reset timeout delay (see Reset Timeout

Delay table) after D to complete the part number. Sample stock

is generally held on standard versions only (see Standard

Versions table). Standard versions have an order increment

requirement of 2500 pieces. Nonstandard versions have an

order increment requirement of 10,000 pieces. Contact factory

for availability.

Pin Configurations continued at end of data sheet.

1

2

4

3

GND

SC70

TOP VIEW

MAX6467XS

MAX6468XS

RESET

MR

Pin Configurations