MAX6826:Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer

The MAX6826—MAX6831 are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two power supplies and have manual reset and watchdog input functions. These devices assert a system reset if any of the monitored supplies fall below the preprogrammed thresholds, and maintain reset for a minimum timeout period after the supplies rise above the threshold. Microprocessor supervisors significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices monitor primary voltages from +1.8V to +5.0V and secondary voltages from +0.9V to +2.5V. These devices are guaranteed to be in the correct state for VCC down to +1.0V. A variety of preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The devices include manual reset and watchdog inputs. The MAX6829/MAX6830/MAX6831 provide a factory-trimmed threshold to monitor a 2nd voltage down to +0.9V. The MAX6826/MAX6829 have a push-pull active-low RESET, the MAX6827/MAX6830 have a push-pull RESET and the MAX6828/MAX6831 have an open-drain active-low RESET. The MAX6826/MAX6827/MAX6828 have an auxiliary monitor that allows user adjustable input to monitor voltages down to +0.6V. See Selector Guide for functions available.

Key Features
  • Monitor Primary VCC Supplies from +1.8V to +5.0V and Secondary VCC2 Supplies from +0.9V to +2.5V
  • User Adjustable RESET IN Down to +0.63V (MAX6826/MAX6827/MAX6828)
  • 140ms (min) Reset Timeout Delay
  • 1.6s Watchdog Timeout Period
  • Manual Reset Input
  • Three Reset Output Options
  • Guaranteed Reset Valid Down to VCC = +1.0V
  • Immune to Short Negative VCC Transients
  • No External Components
  • Small 6-pin SOT23 Packages
MAX6826, MAX6827, MAX6828, MAX6829, MAX6830, MAX6831: Typical Operating Circuit
MAX6826, MAX6827, MAX6828, MAX6829, MAX6830, MAX6831: Typical Operating Circuit
Applications/Uses
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Multivoltage Systems
  • Portable/Battery-Powered Equipment
DataSheet
titleDownload file
MAX6826-MAX6831 Data SheetMAX6826-MAX6831.pdf
Parametrics
Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6826Factory Fixed0 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
Push-Pull
85ms to 300msInput (WDI)1s to 2sAdjustable Reset Input
Manual Reset
2.516SOT/6$2.04 @1k
MAX6827Active High
Push-Pull
Adjustable Reset Input
Manual Reset
SOT/6$2.05 @1k
MAX6828Active Low
Open Drain
Adjustable Reset Input
Manual Reset
SOT/6$2.05 @1k
MAX6829Active Low
Push-Pull
Manual ResetSOT/6$2.04 @1k
MAX6830Active High
Push-Pull
Manual ResetSOT/6$2.04 @1k
MAX6831Active Low
Open Drain
Manual ResetSOT/6$2.04 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6826LUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826LUT-TNo Longer AvailableMAX6826LUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826MUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826MUT-TNo Longer AvailableMAX6826MUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826RUT+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826RUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826RUT-TNo Longer AvailableMAX6826RUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826SUT+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826SUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826SUT-TNo Longer AvailableMAX6826SUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6826TUT+ActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826TUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826TUT-TNo Longer AvailableMAX6826TUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826VUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826VUT-TActiveSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826WUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826WUT-TNo Longer AvailableMAX6826WUT+TSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826YUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
MAX6826YUT-TActiveSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826ZUT+TActiveSOT,;6 pin;9 mm²-40°C to +125°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6826ZUT-TActiveSOT,;6 pin;9 mm²-40°C to +125°CNo
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826-MAX6831.pdf MAX6831
MAX6826.pdf MAX6826