MAX6704:Low-Voltage, SOT23, µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer

The MAX6701—MAX6708 microprocessor (µP) supervisory circuits reduce the complexity and components required to monitor power-supply functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX6701—MAX6708 family provides 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 1.6s; a 0.62V threshold detector for power-fail warning; and an active-low manual reset input. The MAX6701—MAX6708 family offers several pinout options to accommodate a variety of multivoltage microprocessor supervision applications. The MAX6701(A)/MAX6702(A)/MAX6703(A) monitor three supply voltages (one fixed threshold and two adjustable) to drive a single reset output and include a manual reset input and a watchdog timer with an independent output. The MAX6704 monitors a single-supply voltage to drive complementary reset outputs and includes an independent adjustable power-fail-in/power-fail-out comparator, a manual reset input, and a reset-based watchdog timer. The MAX6705(A)/MAX6706(A)/MAX6707(A) monitor a single-supply voltage to drive a single reset output and include an independent adjustable power-fail-in/power-fail-out comparator, a manual reset input, and a watchdog timer with an independent output. The MAX6708 is the same as the MAX6704 but without the watchdog timer function. See the Detailed Description for differences between non-A and A versions.

Key Features
  • Small 8-Pin SOT23 Package
  • Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V Supply Voltages
  • 140ms Reset Timeout Delay
  • Power-Fail Input with Independent Output; Monitor Inputs Down to 0.62V (MAX6704—MAX6708)
  • Dual Adjustable Reset Input for Triple-Voltage Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A))
  • 1.6s Watchdog Timeout Period (MAX6701(A)—MAX6707(A))
  • Independent Watchdog Output (MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/MAX6706(A)/MAX6707(A))
  • Manual Reset Input
  • Four Reset Output Stage Options
  • Guaranteed Reset Valid to VCC = 1V
  • Immune to Short Falling VCC Transients
  • Low Cost, Few External Components
MAX6701, MAX6701A, MAX6702, MAX6702A, MAX6703, MAX6703A: Pin Configuration
MAX6701, MAX6701A, MAX6702, MAX6702A, MAX6703, MAX6703A: Pin Configuration
Applications/Uses
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
  • Networking
  • Telecommunications
  • White Goods
DataSheet
titleDownload file
MAX6701-MAX6708 Data SheetMAX6701-MAX6708.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesICC
(µA)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX67040 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Active Low
Push-Pull
85ms to 300msInput (WDI)1s to 2sAdjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
25SOT/8$2.44 @1k
MAX6705Active Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sSOT/8$1.48 @1k
MAX6706Active High
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sSOT/8$1.48 @1k
MAX6707Active Low
Open Drain
Input (WDI)
Input/Output (WDI/WDO)
1s to 2sSOT/8$1.48 @1k
MAX6708Active High
Active Low
Push-Pull
No Watchdog-SOT/8$1.48 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesICC
(µA)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX6701Factory Fixed
R/C Adjustable
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
Push-Pull
85ms to 300msInput (WDI)
Input/Output (WDI/WDO)
1s to 2sAdjustable Reset Input
Manual Reset
25SOT/8$1.48 @1k
MAX6702Active High
Push-Pull
SOT/8$2.55 @1k
MAX6703Active Low
Open Drain
SOT/8$1.58 @1k
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Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6704LKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704LKA-TNo Longer AvailableMAX6704LKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6704MKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704MKA-TNo Longer AvailableMAX6704MKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6704RKA+ActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704RKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704RKA-TNo Longer AvailableMAX6704RKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6704SKA+ActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704SKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704SKA-TNo Longer AvailableMAX6704SKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6704TKA+ActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704TKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704TKA+TG0NActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704TKA-TNo Longer AvailableMAX6704TKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6704YKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704YKA-TNo Longer AvailableMAX6704YKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6704ZKA+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6704ZKA-TNo Longer AvailableMAX6704ZKA+TSOT,;8 pin;9 mm²-40°C to +125°CNo
MAX6701-MAX6708.pdf MAX6703
MAX6701-MAX6708.pdf MAX6707A