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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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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 468kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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 Thresh.
    (V)    		 Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low 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
    		 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  Push-Pull $1.31 @1k
    See All Supervisors (1 Monitored Voltage) (274)

    Key Specifications:  Supervisors (2 Monitored Voltages)
    Part Number Interface Reset Thresh.
    (V)    		 Reset Out tRESET Watchdog Feature Watchdog Timeout Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low 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
    		 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  Push-Pull $1.63 @1k
    See All Supervisors (2 Monitored Voltages) (84)

    Key Specifications:  Supervisors (3 Monitored Voltages)
    Part Number Interface Reset Thresh.
    (V)    		 Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low 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
    		 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)

    Diagram
    MAX6730A, MAX6731A, MAX6732A, MAX6733A, MAX6734A, MAX6735A: Typical Operating Circuit
    Typical Operating Circuit

    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 553
    1 2 3 4 5 6  --->

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

    Land Pattern: Not Available

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

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    MAX6730AUTMD1+T    
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    MAX6730AUTTD6+T    
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    MAX6730AUTVD1+T    
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    MAX6730AUTVD2+T    
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    MAX6730AUTVD6+T    
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    MAX6730AUTWD1+T    
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    MAX6730AUTYD1+T    
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    MAX6730AUTYD2+T    
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    MAX6730AUTYD6+T    
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    MAX6730AUTZD1+T    
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    MAX6730AUTZD2+T    
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    MAX6730AUTZD6+T    
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    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
    MAX6730AUTRD3+  
    		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
    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
    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
    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
    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
    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
    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
    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
    MAX6730AUTZD3+  
    		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
    MAX6730AUTZD3+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
    MAX6731A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6731AUTLD1+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6731AUTLD2+T    
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    MAX6731AUTLD4+T    
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    MAX6731AUTRD1+T    
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    MAX6731AUTTD1+T    
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    MAX6731AUTWD1+T    
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    Filter:
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    Related Products
    MAX6351, MAX6352, MAX6353, MAX6354, MAX6355, MAX6356, MAX6357, MAX6358, MAX6359, MAX6360 Dual/Triple-Voltage µP Supervisory Circuits
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    Document Ref.: 19-0605; Rev 0; 2006-08-09
    This page last modified: 2009-09-04


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