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

Product Details

Key Features

Parametric specs for Supervisors (3 Monitored Voltages)
Reset Thresh. (V) 0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active Low
Open Drain
Interface Factory Fixed
R/C Adjustable
tRESET (min) 85ms to 300ms
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
Supervisor Features Adjustable Reset Input
Manual Reset
ICC (µA) (max) 25
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.76
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (3 Monitored Voltages)
Reset Thresh. (V) 0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active Low
Open Drain
Interface Factory Fixed
R/C Adjustable
tRESET (min) 85ms to 300ms
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
Supervisor Features Adjustable Reset Input
Manual Reset
ICC (µA) (max) 25
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.76

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
    • Active Low Push-Pull (MAX6701(A), MAX6705(A))
    • Active Low Open Drain (MAX6703(A), MAX6707(A))
    • Active High Push-Pull (MAX6702(A), MAX6706(A))
    • Dual Active Low/High Push-Pull (MAX6704, MAX6708)
  • Guaranteed Reset Valid to VCC = 1V
  • Immune to Short Falling VCC Transients
  • Low Cost, Few External Components

Applications/Uses

  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
  • Networking
  • Telecommunications
  • White Goods

Description

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.

Simplified Block Diagram

MAX6701, MAX6701A, MAX6702, MAX6702A, MAX6703, MAX6703A: Pin Configuration MAX6701, MAX6701A, MAX6702, MAX6702A, MAX6703, MAX6703A: Pin Configuration Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .