ADM707:  Low Cost Microprocessor Supervisory Circuit

The ADM705/ADM706/ADM707/ADM708 are low cost microprocessor supervisory circuits. They are suitable for monitoring the 5 V power supply/battery and can also monitor microprocessor activity. ...More

ADM707:  Low Cost Microprocessor Supervisory Circuit

Product Description

The ADM705/ADM706/ADM707/ADM708 are low cost microprocessor supervisory circuits. They are suitable for monitoring the 5 V power supply/battery and can also monitor microprocessor activity.

The ADM705/ADM706 provide the following functions:

  • Power-on reset output during power-up, power-down, and brownout conditions. The RESET output remains operational with VCC as low as 1 V.
  • Independent watchdog timeout, WDO, that goes low if the watchdog input has not been toggled within 1.6 seconds.
  • A 1.25 V threshold detector for power-fail warning, low battery detection, or to monitor a power supply other than 5 V.
  • An active low debounced manual reset input (MR).

    The ADM707/ADM708 differ in that

  • A watchdog timer function is not available.
  • An active high reset output is available in addition to the active low output.

    Two supply voltage monitor levels are available. The ADM705/ADM707 generate a reset when the supply voltage falls below 4.65 V, while the ADM706/ADM708 require that the supply fall below 4.40 V before a reset is issued.

    All parts are available in 8-lead PDIP (N-8) and SOIC (R-8) packages, with the ADM708 also available in an MSOP (RM-8) package.

    Applications

  • Microprocessor systems
  • Computers
  • Controllers
  • Intelligent instruments
  • Automotive systems
  • Critical microprocessor supply monitoring

    • Data Sheet, Rev. F, 2/07

    Features

    • Guaranteed RESET valid with VCC = 1 V
    • 190 μA quiescent current
    • Precision supply voltage monitor
      4.65 V (ADM705/ADM707)
      4.40 V (ADM706/ADM708)
    • 200 ms reset pulse width
    • Debounced TTL/CMOS manual reset input (MR)
    • Independent watchdog timer (ADM705/ADM706)
    • 1.6 sec timeout (ADM705/ADM706)
    • Active high reset output (ADM707/ADM708)
    • Voltage monitor for power-fail or low battery warning
    • Superior upgrade for MAX705 to MAX708

    Diagrams

    ADM707 Diagram
    Functional Block Diagram for ADM707

    Характеристики

    # of Monitored Voltages 1
    Backup-Battery Switch No
    Manual Reset Capability Yes
    Package DIP,SOIC
    Reset Threshold Summary 4.65V
    Reset Output-Stage Active-High/Push-Pull,Active-Low/Push-Pull
    Min Reset Timeout (ms) 160
    Watchdog Timer No

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    Получать уведомление о новинках
    Part# Reset Threshold Summary Min Reset Timeout (ms) Reset Output-Stage Manual Reset Capability Package Price* (1000-4999)
    ADM1810 4.35V & 4.62V 100 Active-Low/Push-Pull No SC70, SOT $0.46
    ADM1811 4.35V & 4.62V 100 Active-Low/Int-Pullup No SC70, SOT $0.46
    ADM1812 4.35V & 4.62V 100 Active-High/Push-Pull No SC70, SOT $0.46
    ADM1813 4.35V & 4.62V 100 Active-Low/Int-Pullup Yes SC70, SOT $0.39
    ADM1815 5 Options--2.18 to 3.06V 100 Active-High/Push-Pull No SC70, SOT $0.39
    ADM1816 5 Options--2.18 to 3.06V 100 Active-Low/Int-Pullup No SC70, SOT $0.46
    ADM1817 5 Options--2.18 to 3.06V 100 Active-High/Push-Pull No SC70, SOT $0.46
    ADM1818 5 Options--2.18 to 3.06V 100 Active-Low/Int-Pullup Yes SC70, SOT $0.45
    ADM6315 6 Options--2.63 to 4.63V 1, 1,120, 140, 20 Active-Low/Open-Drain Yes SOT $0.81
    ADM6319 26 Options--2.5 to 5V 1, 1,120, 140, 20 Active-High/Push-Pull, Active-Low/Push-Pull Yes SOT $0.50
    ADM6322 26 Options--2.5 to 5V 1, 1,200, 140, 20 Active-High/Push-Pull, Active-Low/Open-Drain Yes SOT $0.51
    ADM6384 31 Options--1.58 to 5.0V 1, 1,120, 140, 20 Active-Low/Push-Pull Yes SC70 $0.95
    ADM6711 6 Options--2.32 to 4.63V 140 Active-Low/Push-Pull Yes SC70 $0.26
    ADM6713 6 Options--2.32 to 4.63V 140 Active-Low/Open-Drain Yes SC70 $0.28
    ADM6825 9 Options--1.58 to 4.63V 140 Active-High/Push-Pull, Active-Low/Push-Pull Yes SOT -
    ADM698 4.65V 140 Active-High/Push-Pull, Active-Low/Push-Pull No DIP, SOIC $1.37
    ADM707 4.65V 160 Active-High/Push-Pull, Active-Low/Push-Pull Yes DIP, SOIC $0.97
    ADM708 4 Options--2.63 to 4.4V 160 Active-High/Push-Pull, Active-Low/Push-Pull Yes DIP, SOIC, SOP $0.85