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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
MAX6715A, MAX6716A, MAX6717A, MAX6718A, MAX6719A, MAX6720A, MAX6721A, MAX6722A, MAX6723A, MAX6724A, MAX6725A, MAX6726A, MAX6727A, MAX6728A, MAX6729A, MAX6797A
Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits

Dual/Triple-Voltage, µP Supervisors with Watchdog, Manual Reset Input, and/or Power-Fail Comparator


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 184kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX6715A–MAX6729A/MAX6797A are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.

These devices monitor primary supply voltages (VCC1) from 1.8V to 5.0V and secondary supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see the Reset Voltage Threshold Suffix Guide in the full data sheet). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These devices are guaranteed to be in the correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V.

A variety of push-pull or open-drain reset outputs along with watchdog input, manual-reset input, and power-fail input/output features are available (see the Selector Guide in the full data sheet). Select reset timeout periods from 1.1ms to 1120ms (min) (see the Reset Timeout Period Suffix Guide in the full data sheet). The MAX6715A–MAX6729A/MAX6797A are available in small 5-, 6-, and 8-pin SOT23 packages and operate over the -40°C to +125°C temperature range.

Key Features   Applications/Uses
  • VCC1 (Primary Supply) Reset Threshold Voltages from 1.58V to 4.63V
  • VCC2 (Secondary Supply) Reset Threshold Voltages from 0.79V to 3.08V
  • Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring (0.62V Internal Reference)
  • Watchdog Timer Option
    • 35s (min) Long Startup Period
    • 1.12s (min) Normal Timeout Period
  • Manual-Reset Input Option
  • Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)
  • Guaranteed Reset Valid Down to VCC1 or VCC2 = 0.8V
  • Reset Output Logic Options
  • Immune to Short VCC Transients
  • Low Supply Current 14µA (typ) at 3.6V
  • Watchdog Disable Feature
  • Small 5-, 6-, 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 (2 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
    MAX6715A  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
    300ms to 1s
    >1s
    		 No Watchdog - Manual Reset 2.5 39 $1.38 @1k
    MAX6716A  Push-Pull No Watchdog - Manual Reset $1.38 @1k
    MAX6717A  Open Drain No Watchdog - Manual Reset $1.16 @1k
    MAX6718A  Push-Pull No Watchdog - Manual Reset $1.16 @1k
    MAX6721A  Open Drain
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    		 Manual Reset $1.38 @1k
    MAX6722A  Push-Pull
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    		 Manual Reset $1.38 @1k
    MAX6728A  Open Drain
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 $1.50 @1k
    MAX6729A  Push-Pull
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 $1.50 @1k
    MAX6797A  Push-Pull
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 $1.50 @1k
    See All Supervisors (2 Monitored Voltages) (84)

    Key Specifications:  Supervisors (3 Monitored Voltages)
    Part Number Interface Reset Thresh.
    (V)    		 Reset Out Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low Active High min @ +25°C max See Notes
    MAX6719A  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
    300ms to 1s
    >1s
    		 No Watchdog -
    Adjustable Reset Input
    Manual Reset
    		 2.5 39 $1.38 @1k
    MAX6720A  Push-Pull - No Watchdog -
    Adjustable Reset Input
    Manual Reset
    		 $1.38 @1k
    MAX6723A  Open Drain -
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    		 Adjustable Reset Input $1.38 @1k
    MAX6724A  Push-Pull -
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    		 Adjustable Reset Input $1.38 @1k
    MAX6725A  Open Drain Open Drain
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    		 $1.50 @1k
    MAX6726A  Push-Pull Push-Pull
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    		 $1.50 @1k
    MAX6727A  Open Drain -
    Extended Setup Period
    Input (WDI)
    1s to 2s
    >2s
    Adjustable Reset Input
    Manual Reset
    		 $1.50 @1k
    See All Supervisors (3 Monitored Voltages) (32)

    Diagram
    MAX6715A, MAX6716A, MAX6717A, MAX6718A, MAX6719A, MAX6720A, MAX6721A, MAX6722A, MAX6723A, MAX6724A, MAX6725A, MAX6726A, MAX6727A, MAX6728A, MAX6729A: Typical Operating Circuit
    Typical Operating Circuit

    Design Guides
  		• Microprocessor Supervisory (PDF)

    Reliability Reports
  		• Reliability Report: MAX6715A.pdf MAX6717A.pdf MAX6718A.pdf
  		• 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.


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    MAX6715A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
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    MAX6715AUTTWD1+T    
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    Document Ref.: 19-0536; Rev 3; 2008-09-29
    This page last modified: 2008-10-15


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