ADM8616:  Low Voltage Supervisory Circuit with Watchdog in 4-Lead SC70

The ADM8616/ADM8617 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. A power-on reset signal is generated when the ...More

ADM8616:  Low Voltage Supervisory Circuit with Watchdog in 4-Lead SC70

Product Description

The ADM8616/ADM8617 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. A power-on reset signal is generated when the supply voltage rises to a preset threshold level. The ADM8616/ADM8617 have an on-chip watchdog timer that can reset the microprocessor if it fails to strobe within a preset timeout period.

Each part is available in the following nine reset threshold options: 1.58 V, 1.67 V, 2.19 V, 2.32 V, 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V. There are four reset timeout options: 1 ms, 20 ms, 140 ms, and 1120 ms. There are also three possible watchdog timeouts available: 6.3 ms, 102 ms, and 1.6 sec.

The parts differ in terms of reset output configuration. The ADM8616 is active-low with a push-pull output, while the ADM8617 is active-low with an open-drain output.

The ADM8616/ADM8617 are available in 4-lead SC70 packages and typically consume only 5 μA, making them suitable for use in low power, portable applications.

Applications

  • Microprocessor systems
  • Computers
  • Controllers
  • Intelligent instruments
  • Portable equipment

    • Data Sheet, Rev. B, 1/07

    Features

    • 9 RESET threshold options 1.58 V to 4.63 V
    • 4 RESET timeout options 1 ms, 20 ms, 140 ms, 1120 ms
    • 3 watchdog timeout options 6.3 ms, 102 ms, 1.6 sec
    • RESET output stages
      Push-pull active-low (ADM8616)
      Open-drain active-low (ADM8617)
    • Precision 1.8 V to 5 V power supply monitoring
    • Low power consumption (5 μA)
    • Guaranteed reset output valid to VCC = 1 V
    • Power supply glitch immunity
    • Specified over −40°C to +85°C temperature range
    • 4-lead SC70 package

    Diagrams

    ADM8616 Diagram
    Functional Block Diagram for ADM8616

    Specifications

    Batt-Backup-Flg No
    Manual Reset Capability No
    Reset Threshold Summary 9 Options--1.58 to 4.63V
    Reset Output-Stage Active-Low/Push-Pull
    Min Reset Timeout (ms) 1,1120,140,20
    Typ Watchdog Timeout (ms) 102,1600,6.3
    Watchdog Timer Yes
    Package SC70
    Power Fail Indicator No

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    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
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    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 -
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