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MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753

µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX6746–MAX6753 low-power microprocessor (µP) supervisory circuits monitor single/dual system supply voltages from 1.575V to 5V and provide maximum adjustability for reset and watchdog functions. These devices assert a reset signal whenever the V_CC supply voltage or RESET IN falls below its reset threshold or when manual reset is pulled low. The reset output remains asserted for the reset timeout period after V_CC and RESET IN rise above the reset threshold. The reset function features immunity to power-supply transients.

The MAX6746–MAX6753 have ±2% factory-trimmed reset threshold voltages in approximately 100mV increments from 1.575V to 5.0V and/or adjustable reset threshold voltages using external resistors.

The reset and watchdog delays are adjustable with external capacitors. The MAX6746–MAX6751 contain a watchdog select input that extends the watchdog timeout period by 128x. The MAX6752/MAX6753 contain a window watchdog timer that looks for activity outside an expected window of operation.

The MAX6746–MAX6753 are available with a push-pull or open-drain active-low RESET output. The MAX6746–MAX6753 are available in an 8-pin SOT23 package and are fully specified over the automotive temperature range (-40°C to +125°C).

Data Sheet

Download	Rev 6	(PDF, 176kB)
E-Mail

Key Features

Factory-Set Reset Threshold Options from 1.575V to 5V in ~100mV Increments
Adjustable Reset Threshold Options
Single/Dual Voltage Monitoring
Capacitor-Adjustable Reset Timeout
Capacitor-Adjustable Watchdog Timeout
Min/Max (Windowed) Watchdog Option
Manual Reset Input Option
Guaranteed Active-Low RESET Valid for V_CC > 1V
3.7µA Supply Current
Push-Pull or Open-Drain Active-Low RESET Output Options
Power-Supply Transient Immunity
Small 8-Pin SOT23 Packages

Applications/Uses

Automotive
Battery-Powered Computers/Controllers
Computers
Critical µP Monitoring
Embedded Controllers
Intelligent Instruments
Medical Equipment
Portable Equipment
Set-Top Boxes

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

MAX6746

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

1s to 2s

<1s

>2s

Adjustable

Manual Reset

$1.25 @1k

MAX6747

Active Low

Open Drain

Cap Adjustable

Input (WDI)

Manual Reset

$1.20 @1k

MAX6748

Active Low

Push-Pull

Cap Adjustable

Input (WDI)

Adjustable Reset Input

$1.25 @1k

MAX6749

Active Low

Open Drain

Cap Adjustable

Input (WDI)

Adjustable Reset Input

$1.25 @1k

MAX6752

Active Low

Push-Pull

Cap Adjustable

Input (WDI)

Windowed

$1.56 @1k

MAX6753

Active Low

Open Drain

Cap Adjustable

Input (WDI)

Windowed

$1.56 @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

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6750

Factory Fixed

R/C Adjustable

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

1s to 2s

<1s

>2s

Adjustable

Adjustable Reset Input

$1.56 @1k

MAX6751

Active Low

Open Drain

$1.56 @1k

See All Supervisors (2 Monitored Voltages) (84)

Diagram

MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751: Pin Configuration

Pin Configuration

MAX6752, MAX6753: Pin Configuration

Pin Configuration

Application Notes

Application Note 1926		Watchdogs Improve System Reliability—How to Choose the Right Part
Application Note 4229		Comparison of Internal and External Watchdog Timers
Application Note 4558		Simple Latching Watchdog Timer
Tutorial 4671		Improve Sensor Performance and SNR in Pulse Oximeter Designs
Tutorial 4993		Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX6746.pdf MAX6747.pdf MAX6751.pdf MAX6752.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

MAX6746 IBIS Model

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Devices: 1-50 / 277

<-- Previous 1 2 3 4 5 6 Next -->

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6746KA16+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA16+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA16-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA17-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA18-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA19-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA20-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA21-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA22-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA23+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°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
MAX6746KA23+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA23-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA24-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA25-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA26+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA26+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA26-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA27-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA28-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA29+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°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
MAX6746KA29+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA29-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA29/V+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA30-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA31+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA31+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA31+T10			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA31-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA32-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA33-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6746KA34-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA35-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA36-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA37-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA38-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA39-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA40-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA41-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA42-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA43-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6746KA44-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA45-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA46+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6746KA46-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA47-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA48-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA49-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6746KA50-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6747KA16			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet
MAX6747KA16-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +125°C	See data sheet

Devices: 1-50 / 277

<-- Previous 1 2 3 4 5 6 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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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-2530 Rev 6; 2011-05-05
This page last modified: 2011-05-05

µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Application Notes

Product Guides

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

Similar Products by Application

More Information

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products