Datasheet

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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-

able in a small 10-pin µMAX

(3mm x 3mm) package.

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

automotive temperature range.

Applications

Features

♦ 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

♦ Adjustable Voltage Threshold Monitors Down to

0.5V with 1.5% Accuracy

♦ Open-Drain RESET Output with 70µA Internal

Pullup

♦ Fixed 140ms (min) Reset Timeout Period

♦ Manual Reset Input

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

♦ Tolerance Select (5%/10%) Input

♦ Immune to Short Supply Transients

MAX16055

Ultra-Small, Hex Voltage,

Microprocessor Supervisor

________________________________________________________________

Maxim Integrated Products

1 +

GND

RESET

TOLIN4

IN3

IN2

IN1

MAX16055

μMAX

TOP VIEW

IN6IN5

Pin Configuration

Ordering Information

MAX16055

μP

RESET

10kΩ

IN2

GND

TOL

MONITORED

SUPPLIES

IN1

0.1μF

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.

Summary of content (9 pages)

PAGE 1
9-4411; Rev 0; 1/09 Ultra-Small, Hex Voltage, Microprocessor Supervisor The MAX16055 precision hex voltage microprocessor (µP) supervisory circuit monitors up to six system-supply voltages and asserts a single reset when any one supply voltage drops below its preset threshold. The device significantly reduces system size and component count while improving reliability compared to multiple ICs or discrete components.
PAGE 2
MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor ABSOLUTE MAXIMUM RATINGS RESET, TOL, MR, IN_ to GND ..................................-0.3V to +6V Input/Output Current (all pins) ............................................20mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature .......
PAGE 3
Ultra-Small, Hex Voltage, Microprocessor Supervisor (VIN1 = 1V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25°C.) (Note 1) PARAMETER Adjustable Threshold Reset Threshold Hysteresis SYMBOL VTH VHYST CONDITIONS VIN_ decreasing MIN TYP MAX TOL = GND 0.491 0.5 0.506 TOL = VIN1 0.465 0.472 0.
PAGE 4
Typical Operating Characteristics (VIN1 = 3.3V, TA = +25°C, unless otherwise noted.) NORMALIZED THRESHOLD ERROR vs. TEMPERATURE IN1 INPUT CURRENT (μA) 60 50 40 30 20 10 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (°C) IN1 VOLTAGE (V) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE RESET PROPAGATION DELAY vs.
PAGE 5
Ultra-Small, Hex Voltage, Microprocessor Supervisor RESET TIMEOUT DELAY MR-TO-RESET PROPAGATION DELAY MAX16055 toc09 MAX16055 toc10 VIN_ = 3.3V IN_ 1V/div MR 2V/div RESET 1V/div RESET 2V/div 40ms/div 40ns/div Pin Description PIN NAME FUNCTION 1 IN1 Voltage Input 1. IN1 is the power-supply input and voltage monitoring input for the device. Connect a 0.1µF bypass capacitor from IN1 to GND. Keep IN1 or IN2 > 1V to ensure RESET is valid. 2 IN2 Voltage Input 2.
PAGE 6
MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor ALL DEVICES ARE POWERED FROM IN1 (3.3V/2.5V); RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V IN1 3.3V IN2 ADJ IN1 IN2 PULLUP 70μA IN3 ADJ TIMEOUT (200ms) RESET IN4 1.8V UVLO IN5 ADJ IN6 ADJ IN1 TOL REF MAX16055C MR Figure 1. Functional Diagram Detailed Description The MAX16055 hex voltage µP supervisory circuit maintains system integrity in multisupply systems (Figure 1).
PAGE 7
Ultra-Small, Hex Voltage, Microprocessor Supervisor Reset Output The MAX16055 RESET output asserts low when any monitored IN_ voltage drops below the specified reset threshold. RESET remains low for the reset timeout period of 140ms (min) after all inputs rise above the respective thresholds (Figure 2). The RESET output is open drain with a weak internal pullup to the monitored IN1 supply (70µA typ). For many applications, no external pullup resistor is required to interface with other logic devices.
PAGE 8
MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor VINTH VIN1 VIN2 VTH + VHYST MAX16055 R1 VIN3 VIN4 VIN5 R2 VIN6 VTH tRP RESET tRP BEGINS WHEN THE LAST SUPPLY EXCEEDS ITS VTH + VHYST Figure 4. RESET Output with Various Input Voltages R1 = R2 ( VVINTH -1) TH Figure 5. Setting the Adjustable Threshold Manual-Reset Input (MR) Applications Information Many µP-based products require manual-reset capability. A logic-low on MR asserts RESET low.
PAGE 9
Ultra-Small, Hex Voltage, Microprocessor Supervisor PART* (SUFFIX IN BOLD) NOMINAL INPUT VOLTAGE (V) IN1 IN2 IN3 IN4 IN5 IN6 MAX16055A 3.3 2.5 1.5 1.8 1.2 0.9 MAX16055B 3.3 3.0 1.8 1.5 1.1 1.0 MAX16055C 3.3 ADJ ADJ 1.8 ADJ ADJ MAX16055D 3.3 ADJ 1.5 ADJ ADJ ADJ MAX16055E 3.3 2.5 ADJ 1.8 ADJ ADJ MAX16055F 3.3 2.5 1.5 ADJ ADJ ADJ MAX16055G 3.3 2.5 ADJ ADJ ADJ ADJ MAX16055H 3.3 ADJ ADJ ADJ ADJ ADJ MAX16055I 2.