MAX708S:+3V Voltage Monitoring, Low-Cost, µP Supervisory Circuits

The MAX706P/R/S/T, MAX706AP/AR/AS/AT, and MAX708R/S/T microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor +3V power-supply levels in +3V to +5V µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX706P/R/S/T and MAX706AP/AR/AS/AT supervisory circuits provide the following four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6s. 3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than the main supply. 4) An active-low, manual-reset input. The only difference between the MAX706R/AR, MAX706S/AS, and MAX706T/AT is the reset-threshold voltage levels, which are 2.63V, 2.93V, and 3.08V, respectively. All have active-low reset output signals. The MAX706P/AP are identical to the MAX706R/AR, except the reset output signal is active-high. The watchdog timer function for the MAX706AP/AR/AS/AT disables when the WDI input is left open or connected to a high-impedance state of a low-leakage tri-state output. The MAX708R/S/T provide the same functions as the MAX706R/S/T and MAX706AR/AS/AT except they do not have a watchdog timer. Instead, they provide both active-low RESET and RESET outputs. As with the MAX706, devices with R, S, and T suffixes have reset thresholds of 2.63V, 2.93V, and 3.08V, respectively. These devices are available in 8-pin SO, DIP, and µMAX® packages and are fully specified over the operating temperature range.

Key Features
  • µMAX Package, Small 8-Pin SO
  • Precision Supply-Voltage Monitors
    • 2.63V (MAX706P/R, MAX706AP/AR, and MAX708R)
    • 2.93V (MAX706S, MAX706AS, and MAX708S)
    • 3.08V (MAX706T, MAX706AT, and MAX708T)
  • 200ms Reset Time Delay
  • Debounced TTL/CMOS-Compatible Manual Reset Input
  • 100µA Quiescent Current
  • WDI Disable Feature (MAX706AP/AR/AS/AT)
  • Watchdog Timer: 1.6s Timeout
  • Reset Output Signal:
    • Active-High Only (MAX706P, MAX706AP)
    • Active-Low Only (MAX706R/S/T, MAX706AR/AS/AT)
    • Active-High and Active-Low (MAX708R/S/T)
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • 8-Pin Surface-Mount Package
  • Guaranteed active-low RESET Assertion to VCC = 1V
MAX706AP, MAX706AR, MAX706AS, MAX706AT, MAX706P, MAX706R, MAX706S, MAX706T, MAX708R, MAX708S, MAX708T: Pin Configuration
MAX706AP, MAX706AR, MAX706AS, MAX706AT, MAX706P, MAX706R, MAX706S, MAX706T, MAX708R, MAX708S, MAX708T: Pin Configuration
Applications/Uses
  • Battery-Powered Equipment
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
  • Portable Instruments
DataSheet
titleDownload file
MAX706AP-MAX708T Data SheetMAX706AP-MAX708T.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX706P2.5 to 3.3Active High
Push-Pull
85ms to 300msInput (WDI)
Input/Output (WDI/WDO)
1s to 2sAdjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
2.5200µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.82 @1k
MAX706RActive Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sµMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.77 @1k
MAX706SActive Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sµMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.77 @1k
MAX706TActive Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sµMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.77 @1k
MAX708RActive High
Active Low
Push-Pull
No Watchdog-µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.01 @1k
MAX708SActive High
Active Low
Push-Pull
No Watchdog-µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$3.01 @1k
MAX708TActive High
Active Low
Push-Pull
No Watchdog-µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.58 @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
MAX708SC/DActiveDICE SALES,;NA pin;DICE;See data sheet
MAX708SCPANo Longer AvailablePDIP(N),;8 pin;79.7 mm²0°C to +70°CNo
MAX708SCSANo Longer AvailableMAX708SCSA+SOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX708SCSA+ActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX708SCSA+TActiveSOIC(N),;8 pin;30.9 mm²0°C to +70°CLead Free
MAX708SCSA-TNo Longer AvailableMAX708SCSA+TSOIC(N),;8 pin;30.9 mm²0°C to +70°CNo
MAX708SCUANo Longer AvailableMAX708SCUA+µMAX,;8 pin;15.6 mm²0°C to +70°CNo
MAX708SCUA+ActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX708SCUA+TActiveµMAX,;8 pin;15.6 mm²0°C to +70°CLead Free
MAX708SCUA-TNo Longer AvailableMAX708SCUA+TµMAX,;8 pin;15.6 mm²0°C to +70°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX708SEPANo Longer AvailablePDIP(N),;8 pin;79.7 mm²-40°C to +85°CNo
MAX708SESANo Longer AvailableMAX708SESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX708SESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX708SESA+TActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX708SESA-TNo Longer AvailableMAX708SESA+TSOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX708SEUANo Longer AvailableMAX708SEUA+µMAX,;8 pin;15.6 mm²-40°C to +85°CNo
MAX708SEUA+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX708SEUA+TActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
MAX708SEUA-TNo Longer AvailableMAX708SEUA+TuMAX;-40°C to +85°CSee data sheet
MAX708SMJAActiveCDIP(N),;8 pin;82.6 mm²-55°C to +125°CNo
MAX706AP-MAX708T.pdf MAX708T
MAX708S.pdf MAX708S
MAX706AP-MAX708T.pdf MAX706AP