MAX6339BUT-T Maxim Integrated, MAX6339BUT-T Datasheet

MAX6339BUT-T

Manufacturer Part Number

MAX6339BUT-T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6339r

Datasheet

1.MAX6339AUT-T.pdf (9 pages)

Specifications of MAX6339BUT-T

Number Of Voltages Monitored

Monitored Voltage

- 5 V, 1.8 V, 2.5 V, 3 V

Undervoltage Threshold

4.5 V, 3 V

Overvoltage Threshold

3.15 V, 4.75 V

Output Type

Active Low, Open Drain

Manual Reset

Not Resettable

Watchdog

No Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

280 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Maximum Power Dissipation

695.7 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

55 uA

Supply Voltage - Min

1 V

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The MAX6339 is a precision quad voltage monitor with

microprocessor (µP) supervisory reset timing. The device

can monitor up to four system supply voltages without

any external components and asserts a single reset if any

supply voltage drops below its preset threshold. The

device significantly reduces system size and component

count while improving reliability compared to separate

ICs or discrete components.

A variety of factory-trimmed threshold voltages are avail-

able to accommodate different supply voltages and toler-

ances with minimal external component requirements.

The selection includes internally fixed options for monitor-

ing +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and -5.0V sup-

plies with -5% and/or -10% tolerances. The device is also

available with one or two user-adjustable threshold

options if non-standard thresholds are desired (use exter-

nal resistor-divider network).

The quad monitor provides a single active-low reset out-

put that is asserted when any monitored input is below its

associated threshold. The output is open drain with a

weak internal pullup (10µA) to IN2. Reset remains low for

a reset timeout period (140ms min) after all voltages are

above the selected thresholds. The output is valid as long

as either the IN1 or IN2 input voltage remains > 1V.

The MAX6339 is available in a small 6-pin SOT23 pack-

age and operates over the extended (-40°C to +85°C)

temperature range.

________________________Applications

19-1756; Rev 3; 12/05

Pin Configuration appears at end of data sheet.

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.

Telecommunications

High-End Printers

Desktop and Network Computers

Data Storage Equipment

Networking Equipment

Industrial Equipment

Set-Top Boxes

________________________________________________________________ Maxim Integrated Products

General Description

Quad Voltage µP Supervisory Circuit

♦ Monitors Four Power-Supply Voltages

♦ Precision Factory-Set Reset Threshold Options

♦ User-Adjustable Voltage Monitoring Threshold

♦ Low 55µA Supply Current

♦ Open-Drain RESET Output with 10µA Internal

♦ 140ms (min) Reset Timeout Period

♦ RESET Valid to IN1 = 1V or IN2 = 1V

♦ Immune to Short Monitored Supply Transients

♦ No External Components Required

♦ Guaranteed from -40°C to +85°C

♦ Small 6-Pin SOT23 Package

*Insert the desired letter from the Selector Guide into the blank

to complete the part number. There is a 2500 piece minimum

order increment requirement on the SOT package and these

devices are available in tape-and-reel only.

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

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

MAX6339_UT-T*

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

Supplies

Options

Pullup

MONITORED

SUPPLIES

PART

TO BE

Typical Operating Circuit

in SOT Package

-40°C TO +85°C

TEMP. RANGE

Ordering Information

IN1

IN2

IN3

IN4

MAX6339

GND

RESET

PIN-PACKAGE

6 SOT23-6

Features

µP

Related parts for MAX6339BUT-T

MAX6339BUT-T Summary of contents

Page 1

... Data Storage Equipment Networking Equipment Industrial Equipment Set-Top Boxes Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. in SOT Package ♦ Monitors Four Power-Supply Voltages ♦ ...

Page 2

Quad Voltage µP Supervisory Circuit in SOT Package ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Input Voltages (IN_ ) (except -5V)............................-0.3V to +6V RESET.......................................................................-0.3V to +6V Input Voltage (-5V Input) ..........................................-6V to +0.3V Continuous RESET Current .................................................20mA Continuous ...

Page 3

Quad Voltage µP Supervisory Circuit ELECTRICAL CHARACTERISTICS (continued +1V to +5.5V -40°C to +85°C, unless otherwise noted. Typical values are at V IN2 A otherwise noted.) (Note 1) PARAMETER SYMBOL Output Low Voltage V OL Output ...

Page 4

Quad Voltage µP Supervisory Circuit in SOT Package (V = +3.0V +25°C) IN2 A MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE RESET ASSERTED 40 ABOVE THIS LINE 100 ...

Page 5

Quad Voltage µP Supervisory Circuit Detailed Description The MAX6339 is a very small, low-power, quad voltage µP supervisory circuit designed to maintain system integrity in multi-supply systems (Figure 1). The device offers several internally trimmed undervoltage threshold options that minimize ...

Page 6

Quad Voltage µP Supervisory Circuit in SOT Package ALL DEVICES ARE POWERED FROM IN2 (3.0V/3.3V). RESET IS VALID IF V IN1 (5V) IN2 (3.3/3V) IN3 (AUX) IN4 (-5V) V REF REFERENCE Figure 1. Functional Diagram 6 _______________________________________________________________________________________ ...

Page 7

Quad Voltage µP Supervisory Circuit IN_ V TH_ RESET 10 RESET Output Timing Diagram Figure 2. IN2 = +3.3V 100kΩ IN2 RESET MAX6339 GND Figure 3. Interfacing to Different Logic Supply Voltage V INTH ...

Page 8

... Quad Voltage µP Supervisory Circuit in SOT Package PART MAX6339AUT MAX6339BUT MAX6339CUT MAX6339DUT MAX6339EUT MAX6339FUT MAX6339GUT MAX6339HUT MAX6339IUT MAX6339JUT MAX6339KUT MAX6339LUT MAX6339MUT MAX6339NUT MAX6339OUT MAX6339PUT *Adjustable voltage based on +1.23V internal threshold. External threshold voltage can be set using an external resistor-divider. †Normal input voltages for 1.8V and 2.5V are specified for 10% tolerances. ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600_____________________ 9 © 2005 Maxim Integrated Products ...

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