MAX6715

Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits


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

Key Features

  • 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

Applications/Uses

  • Computers/Servers
  • Industrial Equipment
  • Multivoltage Systems
  • Portable Battery-Powered Equipment
  • Printers and Faxes
  • Set-Top Boxes
  • Telecom/Networking Equipment
Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
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
Active Low
Open Drain
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
No Watchdog-Manual Reset2.537
SOT23/6
-
MAX6716 
Active Low
Push-Pull
No Watchdog-Manual Reset
SOT23/6
-
MAX6717 
Active Low
Open Drain
No Watchdog-Manual Reset
SOT23/5
$3.37 @1k
MAX6718 
Active Low
Push-Pull
No Watchdog-Manual Reset
SOT23/5
$3.37 @1k
MAX6721 
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Manual Reset
SOT23/6
$3.37 @1k
MAX6722 
Active Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Manual Reset
SOT23/6
$3.37 @1k
MAX6728 
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOT23/8
-
MAX6729 
Active Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOT23/8
$3.37 @1k
See All Supervisors (2 Monitored Voltages) (73)

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
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
Active Low
Open Drain
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
No Watchdog-
Adjustable Reset Input
Manual Reset
2.537
SOT23/6
$3.37 @1k
MAX6720 
Active Low
Push-Pull
No Watchdog-
Adjustable Reset Input
Manual Reset
SOT23/6
MAX6723 
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
SOT23/6
MAX6725 
Active High
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT23/8
MAX6726 
Active High
Active Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT23/8
MAX6727 
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT23/8
See All Supervisors (3 Monitored Voltages) (29)
Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 2853 Supervisors in Multivoltage Systems

Quality and Environmental Data

Request Reliability Report for: MAX6715 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources


MAX16136
High-Precision Supervisory with Window Watchdog and Overvoltage Indicator

  • ±1% Accuracy
  • Enables ASIL Compliance at System Level
  • 0.5V to 5V Threshold Range with 20mV Increments

MAX16160
High-Accuracy 4-Channel, Any-Input Supervisory Circuits

  • Valid Active-Low RESET Logic State for Any Input Above 1V
  • ±1% Accuracy for All Inputs
  • Low 17μA Supply Current

Type ID PDF Title
App Note 2853 Supervisors in Multivoltage Systems