ADM708:  3 V, Voltage Monitoring Microprocessor Supervisory Circuit

The ADM706P/ADM706R/ADM706S/ADM706T and the ADM708R/ADM708S/ADM708T microprocessor supervisory circuits are suitable for monitoring either 3 V or 3.3 V power supplies.

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The ADM708R/S/T are also available which is identical to the ADM708 except for the reset threshold monitor levels. The ADM708R/S/T Data Sheet found under the "More Data Sheets" link explains the differences.

ADM708:  3 V, Voltage Monitoring Microprocessor Supervisory Circuit

Product Description

The ADM706P/ADM706R/ADM706S/ADM706T and the ADM708R/ADM708S/ADM708T microprocessor supervisory circuits are suitable for monitoring either 3 V or 3.3 V power supplies.

The ADM706P/ADM706R/ADM706S/ADM706T provide the following functions:

  1. Power-supply monitoring circuitry that generates a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1 V.
  2. Independent watchdog monitoring circuitry that is activated if the watchdog input has not been toggled within 1.6 sec.
  3. A 1.25 V threshold detector for power-fail warning, low battery detection, or to monitor an additional power supply.
  4. An active low debounced MR input.

The ADM706R, ADM706S, and ADM706T are identical except for the reset threshold monitor levels, which are 2.63 V, 2.93 V, and 3.08 V, respectively. The ADM706P is identical to the ADM706R in that the reset threshold is 2.63 V. It differs only in that it has an active high reset output.

The ADM708R/ADM708S/ADM708T provide the same functionality as the ADM706R/ADM706S/ADM706T and only differ in that:

  1. A watchdog timer function is not available.
  2. An active high reset output (RESET) in addition to the active low (RESET) output is available.

All parts are available in narrow 8-lead PDIP and 8-lead SOIC packages.

Applications

  • Microprocessor systems
  • Computers
  • Controllers
  • Intelligent instruments
  • Critical microprocessor monitoring
  • Automotive systems
  • Battery-operated systems
  • Portable instruments

    • Data Sheet, Rev. B, 2/07

    Features

    • Precision supply voltage monitor
      2.63 V (ADM706P, ADM706R, ADM708R)
      2.93 V (ADM706S, ADM708S)
      3.08 V (ADM706T, ADM708T)
    • 100 μA quiescent current
    • 200 ms reset pulse width
    • Debounced manual reset input (MR)
    • Independent watchdog timer 1.6 sec timeout (ADM706x)
    • Reset Output
      Active high (ADM706P)
      Active low (ADM706R/ADM706S/ADM706T)
      Both active high and active low (ADM708R/ADM708S/ADM708T)
    • Voltage monitor for power-fail or low battery warning
    • Guaranteed RESET valid with VCC = 1 V
    • Superior upgrade for MAX706P/R/S/T, MAX708R/S/T

    Diagrams

    ADM708 Diagram
    Functional Block Diagram for ADM708

    Характеристики

    # of Monitored Voltages 1
    Backup-Battery Switch No
    Manual Reset Capability Yes
    Package DIP,SOIC,SOP
    Reset Threshold Summary 4 Options--2.63 to 4.4V
    Reset Output-Stage Active-High/Push-Pull,Active-Low/Push-Pull
    Min Reset Timeout (ms) 160
    Watchdog Timer No

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    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