MAX705:Low-Cost, µP Supervisory Circuits

Low-Cost Reset + Watchdog ICs

The MAX705–MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: A reset output during power-up, power-down, and brownout conditions. An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V. An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of active-low RESET. Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX® packages.

Key Features
  • Supervisory-Function Integration Significantly Improves System Reliability While Reducing Board Space
    • µMAX Package
    • Guaranteed Active Low RESET Valid at VCC = 1V
      • 200ms Reset Pulse Width
      • Debounced TTL/CMOS-Compatible Manual-Reset Input
      • Active-High Reset Output (MAX707/MAX708/MAX813L)
    • Precision-Supply Voltage Monitor
      • 4.65V (MAX705/MAX707/MAX813L)
      • 4.40V (MAX706/MAX708)
    • Voltage Monitor for Power-Fail or Low-Battery Warning
MAX705, MAX706, MAX707, MAX708, MAX813, MAX813L: Typical Operating Circuit
MAX705, MAX706, MAX707, MAX708, MAX813, MAX813L: Typical Operating Circuit
Applications/Uses
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
DataSheet
titleDownload file
MAX705-MAX813L Data SheetMAX705-MAX813L.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX7053.3 to 5.5Active Low
Push-Pull
85ms to 300msInput (WDI)
Input/Output (WDI/WDO)
1s to 2sAdjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
2.5350µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.78 @1k
MAX706Active Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sµMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.82 @1k
MAX707Active High
Active Low
Push-Pull
No Watchdog-µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.01 @1k
MAX708Active High
Active Low
Push-Pull
No Watchdog-µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.82 @1k
Quality and Environmental Data
Related Products
  • MAX6358:Dual/Triple-Voltage µP Supervisory Circuits
  • MAX6359:Dual/Triple-Voltage µP Supervisory Circuits
  • MAX6360:Dual/Triple-Voltage µP Supervisory Circuits
  • MAX6318:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6319:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6317:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6320:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6316:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6321:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
  • MAX6322:5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX705C/DActiveDICE SALES,;NA pin;DICE S;0°C to +70°CSee data sheet
MAX705CPANo Longer AvailableMAX705CPA+PDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX705CPA+ActivePDIP(N),;8 pin;79.7 mm²0°C to +70°CLead Free
MAX705CSANo Longer AvailableMAX705CSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX705CSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX705CSA+TActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX705CSA-G05ActiveN.SO;0°C to +70°CSee data sheet
MAX705CSA-G077ActiveN.SO;0°C to +70°CSee data sheet
MAX705CSA-TNo Longer AvailableMAX705CSA+TSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX705CSA-TG05No Longer AvailableSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX705CSA-TG077No Longer AvailableSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX705CUANo Longer AvailableMAX705CUA+µMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX705CUA+ActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX705CUA+TActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX705CUA-G05ActiveuMAX;0°C to +70°CSee data sheet
MAX705CUA-TNo Longer AvailableMAX705CUA+TµMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX705CUA-TG05No Longer AvailableµMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX705EPANo Longer AvailableMAX705EPA+PDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX705EPA+ActivePDIP(N),;8 pin;79.7 mm²-40°C to +85°CLead Free
MAX705ESANo Longer AvailableMAX705ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX705ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX705ESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX705ESA-TNo Longer AvailableMAX705ESA+TSOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX705ESA/GH9No Longer AvailableMAX705ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX705ESA/GH9-TNo Longer AvailableMAX705ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX705EUANo Longer AvailableMAX705EUA+µMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX705EUA+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX705EUA+TActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX705EUA-TNo Longer AvailableMAX705EUA+TµMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX705MJAActiveCDIP(N),;8 pin;82.6 mm²-55°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX705MJA/883BActiveCDIP(N),;8 pin;82.6 mm²-55°C to +125°CNo
MAX705-MAX813L.pdf MAX708
MAX705.pdf MAX705
MAX705-MAX813L.pdf MAX813L