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ADM803:  Microprocessor Supervisory Circuit in 3-Lead SC70, Active-Low Open-Drain Output

The ADM803 supervisory circuit monitors the power supply voltage in microprocessor systems. It provides a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCC as low as 1V. The ADM803 ...More

ADM803:  Microprocessor Supervisory Circuit in 3-Lead SC70, Active-Low Open-Drain Output

Product Description

The ADM803 supervisory circuit monitors the power supply voltage in microprocessor systems. It provides a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCC as low as 1V. The ADM803 provides an active-low reset signal RESET, and has an open-drain output stage which requires an external pull-up resistor.

Seven reset threshold options are available. The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC.

The ADM803 is available in 3-lead SC70 and consumes only 17µA, making it suitable for low power portable equipment.

Applications

  • Microprocessor Systems
  • Computers
  • Controllers
  • Intelligent Instruments
  • Automotive Systems

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    • Specified over temperature
    • Low power consumption (17 μA)
    • Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
    • Reset assertion down to 1 V VCC
    • 140 ms minimum power-on reset
    • Open-drain RESET output
    • Watchdog Timer: No
    • # of Monitored Voltages: 1
    • Backup-Battery Switch: No
    • Manual Reset Capability: No
    • Package: SC70
    • Reset Threshold Summary: 6 Options--2.32 to 4.63V
    • Reset Output-Stage: Active-Low/Open-Drain
    • Min Reset Timeout (ms): 140

    Functional Block Diagram for ADM803

    Similar Products

    arrow View Full Interactive Product Selection Table
    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
    ADM709 5 Options--2.63 to 4.65V 140 Active-Low/Push-Pull No DIP, SOIC $0.71
    ADM803 6 Options--2.32 to 4.63V 140 Active-Low/Open-Drain No SC70 $0.26
    ADM809 7 Options--2.32 to 4.63V 140 Active-Low/Push-Pull No SC70, SOT $0.62
    ADM810 7 Options--2.32 to 4.63V 140 Active-High/Push-Pull No SC70, SOT $0.61
    ADM811 6 Options--2.32 to 4.63V 140 Active-Low/Push-Pull Yes SOT $0.46
    ADM812 6 Options--2.32 to 4.63V 140 Active-High/Push-Pull Yes SOT $0.46
    ADM825 7 Options--2.19 to 4.63V 140 Active-High/Push-Pull, Active-Low/Push-Pull Yes SC70, SOT $0.51
    ADM8698 4.65V 140 Active-High/Push-Pull, Active-Low/Push-Pull No DIP, SOIC $2.01
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.