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Maxim > Products > Supervisors, Voltage Monitors, Sequencers 
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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Data Sheet
FULL DATA SHEET (PDF, 720kB)
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Description
The MAX6715-MAX6729 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 Reset Voltage Threshold Suffix Guide). 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 Selector Guide). Select reset timeout periods from 1.1ms to 1120ms (min) (see Reset Timeout Period Suffix Guide). The MAX6715-MAX6729 are available in small 5, 6, and 8-pin SOT23 packages and operate over the -40°C to +85°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
  • Small 5, 6, and 8-Pin SOT23 Packages

 
  		• Computers/Servers
  		• Industrial Equipment
  		• Multivoltage Systems
  		• Portable Battery-Powered Equipment
  		• Printers and Faxes
  		• Set-Top Boxes
  		• Telecom/Networking Equipment

    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 Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Package Operating Temp. Range (°C) Price**
    MAX6715  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 15ms to 85ms
    1ms to 15ms
    300ms to 1s
    85ms to 300ms
    >1s     		No Watchdog  -  Manual Reset 2.5 37 Yes SOT-23/6 -40 to +85
    0 to +70     		$1.38 @ 1k
    MAX6716  Push-Pull No Watchdog  -  Manual Reset SOT-23/6 $1.38 @ 1k
    MAX6717  Open Drain No Watchdog  -  Manual Reset SOT-23/5 $1.16 @ 1k
    MAX6718  Push-Pull No Watchdog  -  Manual Reset SOT-23/5 $1.16 @ 1k
    MAX6721  Open Drain Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Manual Reset SOT-23/6 $1.38 @ 1k
    MAX6722  Push-Pull Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Manual Reset SOT-23/6 $1.38 @ 1k
    MAX6728  Open Drain Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input
    Manual Reset
    Power Fail Comparator     		SOT-23/8 $1.50 @ 1k
    MAX6729  Push-Pull Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input
    Manual Reset
    Power Fail Comparator     		SOT-23/8 $1.50 @ 1k
    See All Supervisors (2 Monitored Voltages) (70)

    Key Specifications:   Supervisors (3 Monitored Voltages)
    Part Number Interface Reset Threshold Range (V) Active-Low Reset Output Active-High Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Package Operating Temp. Range (°C) Price**
    MAX6719  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  -  15ms to 85ms
    1ms to 15ms
    300ms to 1s
    85ms to 300ms
    >1s     		No Watchdog  -  Adjustable Reset Input
    Manual Reset     		2.5 37 Yes SOT-23/6 -40 to +85
    0 to +70     		$1.38 @ 1k
    MAX6720  Push-Pull  -  No Watchdog  -  Adjustable Reset Input
    Manual Reset     		SOT-23/6 $1.38 @ 1k
    MAX6723  Open Drain  -  Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input SOT-23/6 $1.38 @ 1k
    MAX6724  Push-Pull  -  Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input SOT-23/6 $1.38 @ 1k
    MAX6725  Open Drain Open Drain Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input
    Manual Reset     		SOT-23/8 $1.50 @ 1k
    MAX6726  Push-Pull Push-Pull Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input
    Manual Reset     		SOT-23/8 $1.50 @ 1k
    MAX6727  Open Drain  -  Input (WDI)
    Extended Setup Period     		1s to 2s
    >2s     		Adjustable Reset Input
    Manual Reset     		SOT-23/8 $1.50 @ 1k
    See All Supervisors (3 Monitored Voltages) (21)
    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.

    Diagram
    MAX6715, MAX6716, MAX6717, MAX6718, MAX6719, MAX6720, MAX6721, MAX6722, MAX6723, MAX6724, MAX6725, MAX6726, MAX6727, MAX6728, MAX6729: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 1926: Watchdogs Improve System Reliability—How to Choose the Right Part - MAX6721, MAX6723, MAX6724, MAX6729
  		• Application Note 2853: Supervisors in Multivoltage Systems - MAX6715, MAX6715

    Evaluation Kits
    none

    Design Guides
  		• MICROPROCESSOR SUPERVISORY (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX6716UTxxDx.pdf MAX6729KAxxDx.pdf
  		• 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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    MAX6715 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6715UTWED3  



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    MAX6715UTYHD6  



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    MAX6715UTTID2  



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    MAX6715UTYFD1  



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    MAX6715UTZID6