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

Product Details

Key Features

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Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 200
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.4
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 200
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.4

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

Applications/Uses

  • Battery-Powered Equipment
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments
  • Portable Instruments

Description

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.

Simplified Block Diagram

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 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.