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Maxim > Products > Supervisors, Voltage Monitors, Sequencers  Automotive 
MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753
µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay


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Data Sheet
FULL DATA SHEET (PDF, 612kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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 VCC 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 VCC 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).

Key Features   Applications/Uses
  		• 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 VCC > 1V
  		• 3.7µA Supply Current
  		• Push-Pull or Open-Drain Active-Low RESET Output Options
  		• Power-Supply Transient Immunity
  		• Small 8-Pin SOT23 Packages

    		  
  		• 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 Threshold Range (V) Active-Low Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Industry Qualified Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX6746  1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5     		Push-Pull 15ms to 85ms
    1ms to 15ms
    300ms to 1s
    85ms to 300ms
    <1ms
    >1s
    Adjustable     		Input (WDI)
    Cap Adjustable     		1s to 2s
    <1s
    >2s
    Adjustable     		Manual Reset 2 10 Yes Automotive - General SOT-23/8 9 -40 to +125
    -40 to +85
    0 to +70     		$1.20 @ 1k
    MAX6747  Open Drain Input (WDI)
    Cap Adjustable     		Manual Reset $1.20 @ 1k
    MAX6748  Push-Pull Input (WDI)
    Cap Adjustable     		Adjustable Reset Input $1.20 @ 1k
    MAX6749  Open Drain Input (WDI)
    Cap Adjustable     		Adjustable Reset Input $1.20 @ 1k
    MAX6752  Push-Pull Input (WDI)
    Cap Adjustable
    Windowed     		 -  $1.50 @ 1k
    MAX6753  Open Drain Input (WDI)
    Cap Adjustable
    Windowed     		 -  $1.50 @ 1k
    See All Supervisors (1 Monitored Voltage) (268)

    Key Specifications:   Supervisors (2 Monitored Voltages)
    Part Number Reset Threshold Range (V) Active-Low Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Industry Qualified Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX6750  1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5     		Push-Pull 15ms to 85ms
    1ms to 15ms
    300ms to 1s
    85ms to 300ms
    <1ms
    >1s
    Adjustable     		Input (WDI)
    Cap Adjustable     		1s to 2s
    <1s
    >2s
    Adjustable     		Adjustable Reset Input 2 10 Yes Automotive - General SOT-23/8 9 -40 to +125
    -40 to +85
    0 to +70     		$1.50 @ 1k
    MAX6751  Open Drain $1.50 @ 1k
    See All Supervisors (2 Monitored Voltages) (79)
    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.

    Application Notes
  		• Application Note 1926: Watchdogs Improve System Reliability—How to Choose the Right Part - MAX6746, MAX6753
  		• Application Note 4229: Comparison of Internal and External Watchdog Timers - MAX6752

    Evaluation Kits
    none

    Design Guides
  		• MICROPROCESSOR SUPERVISORY (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX6746KAxx.pdf MAX6751KAxx.pdf
  		• Request Reliability Report for:

    Software/Models
  		• MAX6746 IBIS Model

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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.


    Devices: 1-462 of 462

    MAX6746 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6746KA20  



    		-40°C to +125°C See data sheet
    MAX6746KA50  



    		-40°C to +125°C See data sheet
    MAX6746KA42  



    		-40°C to +125°C See data sheet
    MAX6746KA27  



    		-40°C to +125°C See data sheet
    MAX6746KA28  



    		-40°C to +125°C See data sheet
    MAX6746KA41  



    		-40°C to +125°C See data sheet
    MAX6746KA40  



    		-40°C to +125°C See data sheet
    MAX6746KA30  



    		-40°C to +125°C See data sheet
    MAX6746KA39  



    		-40°C to +125°C See data sheet
    MAX6746KA32  



    		-40°C to +125°C See data sheet
    MAX6746KA33  



    		-40°C to +125°C See data sheet
    MAX6746KA34  



    		-40°C to +125°C See data sheet
    MAX6746KA35  



    		-40°C to +125°C See data sheet
    MAX6746KA38  



    		-40°C to +125°C See data sheet
    MAX6746KA22  



    		-40°C to +125°C See data sheet
    MAX6746KA25  



    		-40°C to +125°C See data sheet
    MAX6746KA49  



    		-40°C to +125°C See data sheet
    MAX6746KA48  



    		-40°C to +125°C See data sheet
    MAX6746KA47  



    		-40°C to +125°C See data sheet
    MAX6746KA45  



    		-40°C to +125°C See data sheet
    MAX6746KA36  



    		-40°C to +125°C See data sheet
    MAX6746KA44  



    		-40°C to +125°C See data sheet
    MAX6746KA17  



    		-40°C to +125°C See data sheet
    MAX6746KA18  



    		-40°C to +125°C See data sheet
    MAX6746KA19  



    		-40°C to +125°C See data sheet
    MAX6746KA43  



    		-40°C to +125°C See data sheet
    MAX6746KA21  



    		-40°C to +125°C See data sheet
    MAX6746KA24  



    		-40°C to +125°C See data sheet
    MAX6746KA37  



    		-40°C to +125°C See data sheet
    MAX6746KA31+  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA31+T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA31  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA16+  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA16  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA23+  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA23  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA26+  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA46  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA29  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA29+  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA26  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA16+T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA23+T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA26+T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA31-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA29+T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6746KA16-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA35-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA36-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA37-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA38-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA39-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA40-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA42-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA43-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA44-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA45-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA46-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA47-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA48-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA49-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA34-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA33-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA17-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA18-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA19-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA20-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA21-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA22-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA24-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA25-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA26-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA27-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA28-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA29-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA30-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA32-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA50-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6746KA23-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6746KA41-T  
    		SOT-23;8 pin;9 mm²
    Dwg: 21-0078H (PDF)
    Use pkgcode/variation: K8-5*
    		-40°C to +125°C See data sheet
    Materials Analysis
    MAX6747 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6747KA27  



    		-40°C to +125°C See data sheet
    MAX6747KA40  



    		-40°C to +125°C See data sheet
    MAX6747KA30  



    		-40°C to +125°C See data sheet
    MAX6747KA32  



    		-40°C to +125°C See data sheet
    MAX6747KA44  



    		-40°C to +125°C See data sheet
    MAX6747KA33  



    		-40°C to +125°C See data sheet
    MAX6747KA35  



    		-40°C to +125°C See data sheet
    MAX6747KA36  



    		-40°C to +125°C See data sheet
    MAX6747KA34  



    		-40°C to +125°C See data sheet
    MAX6747KA37  



    		-40°C to +125°C See data sheet
    MAX6747KA38  



    		-40°C to +125°C See data sheet
    MAX6747KA39  



    		-40°C to +125°C See data sheet
    MAX6747KA41  



    		-40°C to +125°C See data sheet
    MAX6747KA42  



    		-40°C to +125°C See data sheet
    MAX6747KA43  



    		-40°C to +125°C See data sheet
    MAX6747KA28  



    		-40°C to +125°C See data sheet
    MAX6747KA25  



    		-40°C to +125°C See data sheet
    MAX6747KA47