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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
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


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Data Sheet
FULL DATA SHEET (PDF, 468kB)
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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.

Key Features   Applications/Uses
  • VCC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V
  • VCC2 (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 VCC1 or VCC2 = +0.8V
  • Push-Pull RESET-bar or Open-Drain RESET-bar Output
  • Immune to Short VCC Transients
  • Low Supply Current: 14µA (typ) at +3.6V
  • Small 6-Pin and 8-Pin SOT23 Packages

  
  		• 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 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) Price**
    MAX6730A  1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5     		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 39 $1.31 @ 1k
    MAX6731A  1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5     		Push-Pull 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 39 $1.31 @ 1k
    See All Supervisors (1 Monitored Voltage) (270)

    Key Specifications:   Supervisors (2 Monitored Voltages)
    Part Number Interface Reset Threshold Range (V) Active-Low Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) Price**
    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     		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 39 $1.63 @ 1k
    MAX6733A  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     		Push-Pull 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 39 $1.63 @ 1k
    See All Supervisors (2 Monitored Voltages) (84)

    Key Specifications:   Supervisors (3 Monitored Voltages)
    Part Number Interface 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) Price**
    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     		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 39 $1.79 @ 1k
    MAX6735A  Push-Pull $1.79 @ 1k
    See All Supervisors (3 Monitored Voltages) (32)
    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.

    Evaluation Kits
    none

    Design Guides
  		• Microprocessor Supervisory (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    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.


    Filter:

    Devices: 1-100 of 620

    1 2 3 4 5 6 7  --->

    MAX6730A Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6730AUTLD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTLD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTLD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTLD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTLD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD3+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTMD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTRD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTRD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTRD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTRD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTRD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTSD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTSD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTSD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTSD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTTD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTTD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTTD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTTD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTTD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTVD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTVD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTVD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTVD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTVD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTWD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTWD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTWD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTWD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTWD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTYD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTYD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTYD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTYD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTYD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTZD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTZD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTZD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTZD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTZD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6730AUTLD3+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTLD3+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTRD3+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTRD3+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTSD2+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTSD2+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTSD3+  
    		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  
    		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
    MAX6730AUTTD3+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTTD3+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTVD3+  
    		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
    MAX6730AUTVD3+T  
    		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
    MAX6730AUTWD3+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTWD3+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTYD3+  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTYD3+T  
    		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 See data sheet
    Materials Analysis
    MAX6730AUTZD3+  
    		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
    MAX6730AUTZD3+T  
    		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
    MAX6731A Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6731AUTLD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTLD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTLD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTLD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTLD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD3+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTMD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTRD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTRD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTRD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTRD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTRD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTSD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTSD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTSD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTSD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTSD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTTD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTTD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTTD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTTD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTTD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTVD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTVD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTVD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTVD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTVD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTWD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTWD2+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTWD4+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTWD5+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTWD6+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTYD1+T  


    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Filter:

    Devices: 1-100 of 620

    1 2 3 4 5 6 7  --->


    Related Products
    MAX6351, MAX6352, MAX6353, MAX6354, MAX6355, MAX6356, MAX6357, MAX6358, MAX6359, MAX6360 Dual/Triple-Voltage µP Supervisory Circuits
    MAX6715, MAX6716, MAX6717, MAX6718, MAX6719, MAX6720, MAX6721, MAX6722, MAX6723, MAX6724, MAX6725, MAX6726, MAX6727, MAX6728, MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits

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    Document Ref.: 19-0605; Rev 0; 2006-08-09
    This page last modified: 2006-08-23


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