ADM705:  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 ...More

ADM705:  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

    ADM705 Diagram
    Functional Block Diagram for ADM705

    Specifications

    Batt-Backup-Flg No
    Manual Reset Capability Yes
    Reset Threshold Summary 4.65V
    Reset Output-Stage Active-Low/Push-Pull
    Min Reset Timeout (ms) 160
    Typ Watchdog Timeout (ms) 1600
    Watchdog Timer Yes
    Package DIP,SOIC
    Power Fail Indicator Yes

    Explore Other Products

    AD5100 - System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions

    Subscribe to New Products Feed
    Part# Reset Threshold Summary Min Reset Timeout (ms) Reset Output-Stage Manual Reset Capability Typ Watchdog Timeout (ms) Power Fail Indicator Package Product Description Price* (1000-4999)
    AD5100 Programmable Adj Active-Low/Push-Pull Yes adj. Yes SOP System-Mgmt IC with Programmable Quad Voltage Monitoring and Supervisory Functions $1.60
    ADM1232 4.37V & 4.62V 250 Active-High/Push-Pull, Active-Low/Open-Drain Yes 250, 500, 62.5 No DIP, SOIC, SOP Microprocessor Supervisory Circuit $0.95
    ADM13305 5 Options--0.6Adj to 4.55 140 Active-High/Push-Pull, Active-Low/Push-Pull Yes 1.6 - SOIC Dual Processor Supervisor with Watchdog $0.96
    ADM6316 26 Options--2.5 to 5V 1, 1,200, 140, 20 Active-Low/Push-Pull Yes 102, 1,600, 25,600, 6.3 No SOT Supervisory Ckt w/ Watchdog, Manual Reset & Active-Low, Push-Pull Reset Output in 5-Lead SOT-23 $0.51
    ADM6318 26 Options--2.5 to 5V 1, 1,200, 140, 20 Active-High/Push-Pull, Active-Low/Push-Pull No 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog and Dual Active-Low/Active-High Push-Pull Reset Outputs $0.50
    ADM6320 26 Options--2.5 to 5V 1, 1,200, 140, 20 Active-Low/Open-Drain Yes 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog, Manual Reset & Active-Low, Open-Drain Reset Output $0.51
    ADM6321 26 Options--2.5 to 5V 1, 1,200, 140, 20 Active-High/Push-Pull, Active-Low/Open-Drain No 102, 1,600, 25,600, 6.3 No SOT Supervisory Circuit with Watchdog and Dual Active-Low Open-Drain/Active-High Push-Pull Reset Outputs $0.51
    ADM6821 9 Options--1.58 to 4.63V 140 Active-High/Push-Pull Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-High, Push-Pull Reset Output -
    ADM6822 9 Options--1.58 to 4.63V 140 Active-Low/Open-Drain Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Open-Drain Reset Output -
    ADM6823 9 Options--1.58 to 4.63V 140 Active-Low/Push-Pull Yes 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output $0.76
    ADM6824 9 Options--1.58 to 4.63V 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No SOT Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset, Active-Hi & Low Push-Pull Reset Output -
    ADM699 4.65V 140 Active-High/Push-Pull, Active-Low/Push-Pull No 1,600 No DIP, SOIC µP Supv w/ Watchdog, 4.65V Trip Point, Low Supply Current and Active Low Reset Output $1.68
    ADM705 4.65V 160 Active-Low/Push-Pull Yes 1,600 Yes DIP, SOIC µP Supv w/ 4.65V Trip Voltage, Watchdog, Pwr Fail, Manual Reset & Active Low Reset Output $1.02
    ADM706 4.4V 160 Active-Low/Push-Pull Yes 1,600 Yes DIP, SOIC +3V, Voltage Monitoring µP Supervisory Circuit $1.70