General Description

The MAX16055 precision hex voltage microprocessor

(µP) supervisory circuit monitors up to six system-sup-

ply voltages and asserts a single reset when any one

supply voltage drops below its preset threshold. The

device significantly reduces system size and compo-

nent count while improving reliability compared to multi-

ple ICs or discrete components.

A variety of factory-trimmed threshold voltages are avail-

able to accommodate different supply voltages and tol-

erance with minimal external components. The

MAX16055 includes internally fixed threshold options for

monitoring 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V,

and 0.9V supplies with -5% or -10% tolerance. The

MAX16055 is also available with one to five adjustable

threshold inputs to monitor voltages down to 0.5V.

A single active-low, open-drain output asserts when

any monitored input falls below its associated thresh-

old. The reset output features a weak internal pullup

(typically 70µA) to supply input IN1. The reset output

remains low for the reset timeout period (140ms, min)

after all voltages rise above the selected thresholds.

The reset output remains valid as long as either IN1 or

IN2 input voltage is above 1V. The MAX16055 is avail-

The MAX16055 operates over the -40°C to +125°C

automotive temperature range.

Applications

Features

o Precision Factory-Set Reset Threshold Options

3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and

0.9V

o Adjustable Voltage Threshold Monitors Down to

0.5V with 1.5% Accuracy

o Open-Drain RESET Output with 70µA Internal

Pullup

o Fixed 140ms (min) Reset Timeout Period

o Manual Reset Input

o Reset Valid for IN1 ≥ 1V or IN2 ≥ 1V

o Tolerance Select (5%/10%) Input

o Immune to Short Supply Transients

Ultra-Small, Hex Voltage,

Microprocessor Supervisor

________________________________________________________________

Maxim Integrated Products

1

1

+

2

3

4

5

10

9

8

7

6

GND

RESET

MR

TOL

IN4

IN3

IN2

IN1

MAX16055

µMAX

TOP VIEW

IN6

IN5

Pin Configuration

Ordering Information

MAX16055

µP

RESET

10k

Ω

IN2

MR

GND

TOL

MONITORED

SUPPLIES

IN1

0.1

µF

IN3

IN4

IN5

IN6

Typical Operating Circuit

19-4411; Rev 0; 1/09

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.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

*

Insert the desired threshold option letter from the Selector

Guide into the blank to complete the part number. Contact factory

for availability.

PART

TEMP RANGE

PIN-PACKAGE

MAX16055_AUB+*

-40°C to +125°C

10 µMAX

Telecommunications

High-End Printers

Desktop and Notebook

Computers

Data Storage Equipment

Networking Equipment

Industrial Equipment

Set-Top Boxes

Servers/Workstations

µMAX is a registered trademark of Maxim Integrated Products, Inc.