MAX6730 Maxim, MAX6730 Datasheet

MAX6730

Manufacturer Part Number

MAX6730

Description

Single-/Dual-/Triple-Voltage P Supervisory Circuits with Independent Watchdog Output

Manufacturer

Maxim

Datasheet

1.MAX6730.pdf (16 pages)

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Current page: 1 of 16
Download datasheet (245Kb)

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 temperature range (-40°C to +85°C).

19-2629; Rev 2; 1/03

Typical Operating Circuit and Pin Configurations appear 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.

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

o V

o Adjustable RSTIN Threshold for Monitoring

o Six Reset Timeout Options

o Watchdog Timer with Independent Watchdog Output

o Manual Reset Input

o Guaranteed Reset Valid down to

o Push-Pull RESET or Open-Drain RESET Output

o Immune to Short V

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

o Small 6-Pin and 8-Pin SOT23 Packages

*Note: Insert the threshold level suffixes for V

(Table 1) after “UT” or “KA.” For the MAX6730/MAX6731, insert

only the V

timeout delay (Table 2) after “D” to complete the part number.

For example, the MAX6732UTLTD3-T provides a V

of +4.625V, a V

timeout period. Sample stock is generally held on standard ver-

sions 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.

MAX6730 UT_D_ -T

MAX6731 UT_D_ -T

MAX6732 UT_ _D_ -T

MAX6733 UT_ _D_ -T

MAX6734 KA_ _D_ -T

MAX6735 KA_ _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)

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*

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

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

2 = +0.8V

Ordering Information

TEMP RANGE

-40°C to +85°C

Transients

Features

PIN-PACKAGE

1 and V

6 SOT23-6

8 SOT23-8

1 threshold

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