Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX6730A, MAX6731A, MAX6732A, ...

MAX6730A, MAX6731A, MAX6732A, MAX6733A, MAX6734A, MAX6735A

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

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Monitor Down to 0.63V

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX6730A–MAX6735A single-/dual-/triple-voltage microprocessor (µP) supervisors feature a watchdog timer and manual reset capability. The MAX6730A–MAX6735A offer factory-set reset thresholds for monitoring voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The combination 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 voltages exceed their respective thresholds. Multiple factory-set reset threshold combinations reduce the number of external components required. The MAX6730A/MAX6731A monitor a single fixed voltage, the MAX6732A/MAX6733A monitor two fixed voltages, and the MAX6734A/MAX6735A monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout periods ranging from 1.1ms to 1120ms.

The MAX6730A–MAX6735A 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 watchdog operates in normal mode with a 1.68s delay after initialization. The MAX6730A/MAX6732A/MAX6734A provide an active-low, open-drain watchdog output. The MAX6731A/MAX6733A/MAX6735A provide an active-low, push-pull watchdog output.

Other features include a manual reset input (MAX6730A/MAX6731A/MAX6734A/MAX6735A) and push-pull reset output (MAX6731A/MAX6733A/MAX6735A) or open-drain reset output (MAX6730A/MAX6732A/MAX6734A). The MAX6730A–MAX6733A are offered in a tiny 6-pin SOT23 package. The MAX6734A/MAX6735A are offered in an 8-pin, space-saving SOT23 package. All devices are fully specified over the extended -40°C to +125°C temperature range.

Data Sheet

Download	Rev 0	(PDF, 468kB)
E-Mail

Key Features

V_CC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V
V_CC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V
Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734A/MAX6735A Only)
Six Reset Timeout Options
Watchdog Timer with Independent Watchdog Output
- 35s (min) Initial Watchdog Startup Period
- 1.12s (min) Normal Watchdog Timeout Period
Manual Reset Input (MAX6730A/MAX6731A/MAX6734A/MAX6735A)
Guaranteed Reset Valid down to V_CC1 or V_CC2 = +0.8V
Push-Pull Active-Low RESET or Open-Drain Active-Low RESET Output
Immune to Short V_CC Transients
Low Supply Current: 14µA (typ) at +3.6V
Small 6-Pin and 8-Pin SOT23 Packages

Applications/Uses

Computers/Servers
Industrial Equipment
Multivoltage Systems
Portable Battery-Powered Equipment
Printers/Fax Machines
Set-Top Boxes
Telecom/Networking Equipment

Key Specifications:

Supervisors (1 Monitored Voltage)

Part Number

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6730A

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

1ms to 15ms

15ms to 85ms

85ms to 300ms

>1s

Extended Setup Period

Input (WDI)

Input/Output (WDI/WDO)

1s to 2s

>2s

Manual Reset

2.5

$1.37 @1k

MAX6731A

Active Low

Push-Pull

$1.37 @1k

See All Supervisors (1 Monitored Voltage) (274)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Supervisors (2 Monitored Voltages)

Part Number

Interface

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6732A

Factory Fixed

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

1ms to 15ms

15ms to 85ms

85ms to 300ms

>1s

Extended Setup Period

Input (WDI)

Input/Output (WDI/WDO)

1s to 2s

>2s

2.5

$1.70 @1k

MAX6733A

Active Low

Push-Pull

$1.70 @1k

See All Supervisors (2 Monitored Voltages) (84)

Supervisors (3 Monitored Voltages)

Part Number

Interface

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6734A

Factory Fixed

R/C Adjustable

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

1ms to 15ms

15ms to 85ms

85ms to 300ms

>1s

Extended Setup Period

Input (WDI)

Input/Output (WDI/WDO)

1s to 2s

>2s

Adjustable Reset Input

Manual Reset

2.5

$1.87 @1k

MAX6735A

Active Low

Push-Pull

$1.87 @1k

See All Supervisors (3 Monitored Voltages) (32)

Diagram

Typical Operating Circuit

Application Notes

Application Note 5040

Voltage Monitoring in Complex Systems

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX6735A.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Devices: 1-50 / 550

<-- Previous 1 2 3 4 5 6 7 8 9 10 11 Next -->

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6730AUTLD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTLD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTLD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTLD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTLD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTLD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTMD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTMD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTMD3+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTMD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6730AUTMD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTMD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTRD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTRD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTRD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTRD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTRD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTRD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTSD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTSD2+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6730AUTSD3+			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTSD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTSD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTSD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTSD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTTD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTTD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTTD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTTD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTTD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6730AUTTD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTVD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTVD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTVD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTVD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTVD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTVD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTWD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTWD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTWD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6730AUTWD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTWD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTWD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTYD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTYD2+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTYD3+T			Active	SOT;6 pin;9 mm² Outline Drawing:21-0058 (PDF) Land Pattern: 90-0175 (PDF) Use pkgcode/variation: U6+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6730AUTYD4+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTYD5+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTYD6+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX6730AUTZD1+T			Active	SOT; Land Pattern: Not Available	-40°C to +85°C	See data sheet

Devices: 1-50 / 550

<-- Previous 1 2 3 4 5 6 7 8 9 10 11 Next -->

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Products with Similar Part Numbers

MAX6730, MAX6731, MAX6732, ...

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

More Information

Topmark Coding	MAX6730A
Topmark Coding	MAX6731A
Topmark Coding	MAX6732A
Topmark Coding	MAX6733A
Topmark Coding	MAX6734A
Topmark Coding	MAX6735A

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Document Ref.: 19-0605 Rev 0; 2006-08-09
This page last modified: 2009-12-10