MAX6734KALTD3+T Maxim Integrated Products, MAX6734KALTD3+T Datasheet

MAX6734KALTD3+T

Manufacturer Part Number

MAX6734KALTD3+T

Description

IC SUPERVISOR MPU W/WD SOT23-8

Manufacturer

Maxim Integrated Products

Type

Multi-Voltage Supervisorr

Datasheet

1.MAX6730UTSD2T.pdf (15 pages)

Specifications of MAX6734KALTD3+T

Number Of Voltages Monitored

Output

Open Drain or Open Collector

Reset

Active Low

Reset Timeout

140 ms Minimum

Voltage - Threshold

3.075V, 4.625V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

SOT-23-8

Monitored Voltage

0.9 V to 5 V

Undervoltage Threshold

4.5 V, 3 V

Overvoltage Threshold

4.75 V or 3.15 V

Output Type

Active Low, Open Drain

Manual Reset

Resettable

Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

210 ms

Supply Voltage (max)

5.5 V

Supply Voltage (min)

0.8 V

Supply Current (typ)

15 uA, 4 uA

Maximum Power Dissipation

714 mW

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Power Fail Detection

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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The MAX6730–MAX6735 single-/dual-/triple-voltage

microprocessor (µP) supervisors feature a watchdog

timer and manual reset capability. The MAX6730–

MAX6735 offer factory-set reset thresholds for monitor-

ing voltages from +0.9V to +5V and an adjustable reset

input for monitoring voltages down to +0.63V. The com-

bination of these features significantly improves system

reliability and accuracy when compared to separate

ICs or discrete components.

The active-low reset output asserts and remains asserted

for the reset timeout period after all the monitored volt-

ages exceed their respective thresholds. Multiple factory-

set reset threshold combinations reduce the number of

external components required. The MAX6730/MAX6731

monitor a single fixed voltage, the MAX6732/MAX6733

monitor two fixed voltages, and the MAX6734/MAX6735

monitor two fixed voltages and one adjustable voltage. All

devices are offered with six minimum reset timeout peri-

ods ranging from 1.1ms to 1120ms.

The MAX6730–MAX6735 feature a watchdog timer with

an independent watchdog output. The watchdog timer

prevents system lockup during code execution errors.

A watchdog startup delay of 54s after reset asserts

allows system initialization during power-up. The watch-

dog operates in normal mode with a 1.68s delay after

initialization. The MAX6730/MAX6732/MAX6734 provide

an active-low, open-drain watchdog output. The

MAX6731/MAX6733/MAX6735 provide an active-low,

push-pull watchdog output.

Other features include a manual reset input (MAX6730/

MAX6731/MAX6734/MAX6735) and push-pull reset out-

put (MAX6731/MAX6733/MAX6735) or open-drain reset

output (MAX6730/MAX6732/MAX6734). The MAX6730–

MAX6733 are offered in a tiny SOT23-6 package. The

MAX6734/MAX6735 are offered in a space-saving

SOT23-8 package. All devices are fully specified over

the extended -40°C to +85°C temperature range.

19-2629; Rev 5; 3/09

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.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery-Operated Equipment

Industrial Equipment

Printer/Fax

Set-Top Boxes

Circuits with Independent Watchdog Output

Single-/Dual-/Triple-Voltage µP Supervisory

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ V

♦ Adjustable RSTIN Threshold for Monitoring

♦ Six Reset Timeout Options

♦ Watchdog Timer with Independent Watchdog Output

♦ Manual Reset Input

♦ Guaranteed Reset Valid down to

♦ Push-Pull RESET or Open-Drain RESET Output

♦ Immune to Short V

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

♦ Small 6-Pin and 8-Pin SOT23 Packages

* Insert the threshold level suffixes for V

after “UT” or “KA.” For the MAX6730/MAX6731, insert only the

delay (Table 2) after “D” to complete the part number. For exam-

ple, the MAX6732UTLTD3-T provides a V

+4.625V, a V

out period. Sample stock is generally held on standard versions

only (see the 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.

Devices are available in both leaded and lead(Pb)-free/RoHS-

compliant packaging.

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

MAX6730UT_D_ -T

MAX6731UT_D_ -T

MAX6732UT_ _D_ -T

MAX6733UT_ _D_ -T

MAX6734KA_ _D_ -T

MAX6735KA_ _D_ -T

from +1.575V to +4.63V

Voltages from +0.79V to +3.08V

Voltages Down to +0.63V (MAX6734/MAX6735 Only)

(MAX6730/MAX6731/MAX6734/MAX6735)

1 threshold suffix after the “UT.” Insert the reset timeout

35s (min) Initial Watchdog Startup Period

1.12s (min) Normal Watchdog Timeout Period

1 (Primary Supply) Reset Threshold Voltages

2 (Secondary Supply) Reset Threshold

1 or V

PART*

2 threshold of +3.075V, and a 210ms reset time-

2 = +0.8V

Ordering Information

-40°C to +85°C

TEMP RANGE

Transients

1 and V

1 threshold of

Features

PIN-PACKAGE

6 SOT23

8 SOT23

2 (Table 1)

Related parts for MAX6734KALTD3+T

MAX6734KALTD3+T Summary of contents

Page 1

... Industrial Equipment Printer/Fax Set-Top Boxes Typical Operating Circuit and Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ (Primary Supply) Reset Threshold Voltages CC from +1 ...

Page 2

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ABSOLUTE MAXIMUM RATINGS 2, RSTIN, MR, WDI to GND .....................-0. RST, WDO to GND (open drain)...............................-0.3V to +6V RST, WDO to GND (push-pull) .................-0.3V to ...

Page 3

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ELECTRICAL CHARACTERISTICS (continued +0.8V to +5.5V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYM B O ...

Page 4

Page 5

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE ( +5V +3.3V ...

Page 6

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted NORMALIZED TIMEOUT PERIOD vs. TEMPERATURE 1.0040 1.0035 1.0030 1.0025 1.0020 1.0015 1.0010 1.0005 1.0000 0.9995 ...

Page 7

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output PIN NAME MAX6730 MAX6732 MAX6734 MAX6731 MAX6733 MAX6735 — — — — 7 ...

Page 8

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Table 1. Reset Voltage Threshold Suffix Guide NOMINAL CC PART NO. SUFFIX VOLTAGE THRESHOLD(V) LT 4.625 MS 4.375 MR 4.375 TZ 3.075 SY 2.925 RY 2.625 TW 3.075 SV 2.925 ...

Page 9

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Manual Reset Input Many µP-based products require manual reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts the ...

Page 10

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output The RSTIN comparator derives power from V the input voltage must remain less than or equal Low leakage current at RSTIN allows the use of CC large-valued resistors, resulting ...

Page 11

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output (MIN) RSTIN t RP RST WDO WDI MR Figure 4. Watchdog Input/Output Timing Diagram (MR and WDO Connected) Applications Information Interfacing to ...

Page 12

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Overdrive, for which reset pulses are not generated. The graph was produced using falling V starting above V and ending below the reset thresh- TH old by the magnitude indicated (reset threshold ...

Page 13

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output PART MAX6730UTLD3-T MAX6730UTSD3-T MAX6730UTRD3-T MAX6730UTZD3-T MAX6730UTVD3-T MAX6731UTLD3-T MAX6731UTTD3-T MAX6731UTSD3-T MAX6731UTRD3-T MAX6731UTZD3-T MAX6731UTVD3-T MAX6732UTLTD3-T MAX6732UTSYD3-T MAX6732UTSVD3-T MAX6732UTRVD3-T MAX6732UTSHD3-T MAX6732UTTGD3-T MAX6732UTSDD3-T MAX6732UTZWD3-T MAX6732UTYHD3-T MAX6732UTZGD3-T MAX6732UTYDD3-T MAX6732UTVHD3-T MAX6732UTWGD3-T MAX6732UTVDD3-T MAX6733UTLTD3-T MAX6733UTSYD3-T MAX6733UTSVD3-T MAX6733UTRVD3-T MAX6733UTSHD3-T MAX6733UTTGD3-T ...

Page 14

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output TOP VIEW RST 1 MAX6730 GND 2 MAX6731 WDO 3 SOT23-6 Typical Operating Circuit +0.9V V CORE RSTIN RST MAX6734 WDI MAX6735 WDO PUSHBUTTON MR SWITCH ...

Page 15

... 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 ____________________ 15 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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