ADM692:  µP Supervisor with Backup Battery Switchover, Watchdog Feature, Power Fail Warning, 4.4V Threshold Voltage, Active Low Reset and 100mA Output Current

The ADM690-ADM695 family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP ...More

ADM692:  µP Supervisor with Backup Battery Switchover, Watchdog Feature, Power Fail Warning, 4.4V Threshold Voltage, Active Low Reset and 100mA Output Current

Product Description

The ADM690-ADM695 family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.

The ADM690, ADM692 and ADM694 are available in 8-pin DIP packages and provide:

  • Power-on reset output during power-up, power-down and brownout conditions. The RESET output remains operational with VCC as low as 1 V.
  • Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
  • A reset pulse if the optional watchdog timer has not been toggled within a specified time.
  • A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5 V.

    • The ADM691, ADM693 and ADM695 are available in 16-pin DIP and small outline packages and provide three additional functions.

  • Write protection of CMOS RAM or EEPROM.
  • Adjustable reset and watchdog timeout periods.
  • Separate watchdog timeout, backup battery switchover, and low VCC status outputs.

    • The ADM690-ADM695 family is fabricated using an advanced epitaxial CMOS process combining low power consumption (5 mW), extremely fast Chip Enable gating (5 ns) and high reliability. RESET assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.

    Features

    • Superior Upgrade for MAX690–MAX695
    • Specified Over Temperature
    • Low Power Consumption (5 mW)
    • Precision Voltage Monitor
    • Reset Assertion Down to 1 V VCC
    • Low Switch On-Resistance 1.5 O Normal, 20 O in Backup
    • High Current Drive (100 mA)
    • Watchdog Timer—100 ms, 1.6 s, or Adjustable
    • 600 nA Standby Current
    • Automatic Battery Backup Power Switching
    • Extremely Fast Gating of Chip Enable Signals (5 ns)
    • Voltage Monitor for Power Fail

    Diagrams

    • Enlarge
    • Symbols and Footprints
    ADM692 Diagram
    Functional Block Diagram for ADM692

    Specifications

    Backup-Battery Switch Yes
    Batt-Backup-Flg Yes
    Chip Enable Gating ---
    Package DIP
    Reset Threshold Summary 4.4V
    Reset Output-Stage Active-Low/Push-Pull
    Min Reset Timeout (ms) 35
    Typ Watchdog Timeout (ms) 100,1600,adj.

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    Part# Reset Threshold Summary Min Reset Timeout (ms) Reset Output-Stage Backup-Battery Switch Chip Enable Gating Typ Watchdog Timeout (ms) Package Product Description Price* (1000-4999)
    ADM8696 1.3V 35 (Adjustable) Active-High/Push-Pull, Active-Low/Push-Pull Yes --- 100, 1,600, adj. DIP, SOIC, SOP µP Supv w/ Backup Batt Switch, Adj Low Line V Monitor, Adj Watchdog Timer, Pwr Fail& Watchdog Status $2.72
    ADM8697 1.3V 35 (Adjustable) Active-High/Push-Pull, Active-Low/Push-Pull No Yes 100, 1,600, adj. DIP, SOIC, SOP µP Supv w/ CE Inputs, Adj Low Line V Monitor, Adj Watchdog Timer; Low Line, Pwr Fail&Watchdog Status $2.72
    ADM696 1.3V (Adjustable) 35 Active-High/Push-Pull, Active-Low/Push-Pull Yes --- 100, 1,600, adj. DIP, SOIC µP Supv w/ Backup Battery Switchover, Adj Low Line V Monitor, Adj Watchdog Timer, 100 mA Iout $2.63
    ADM697 1.3V (Adjustable) 35 Active-High/Push-Pull, Active-Low/Push-Pull No Yes 100, 1,600, adj. DIP, SOIC µP Supv with CE Inputs, Adj Low Line V Monitor, Adj W-dog Timer, Low Line, Pwr Fail & W-dog Status $2.63
    ADM692 4.4V 35 Active-Low/Push-Pull Yes --- 100, 1,600, adj. DIP µP Supervisor with Backup Battery Switchover, Watchdog, Power Fail Warning, Reset Generator $2.42
    ADM692A 4.4V 140 Active-Low/Push-Pull Yes --- 1,600 DIP, SOIC µP Supervisor w/ Battery Steering, Watchdog, Pwr Fail Warning, Active Low Reset, 250mA Iout $1.68
    ADM693 4.4V 35 (Adjustable) Active-High/Push-Pull, Active-Low/Push-Pull Yes Yes 100, 1,600, adj. DIP, SOIC µP Supervisor with Backup Battery Switchover, Watchdog, Pwr Fail Warning, 4.4V Threshold, 100mA $2.73
    ADM693A 4.4V 140 (Adjustable) Active-High/Open-Drain, Active-Low/Push-Pull Yes Yes 100, 1,600, adj. DIP, SOIC µP Supervisor w/ Backup Battery Switchover, Watchdog, Pwr Fail Warning, 4.4V Threshold, 250mA Iout $1.85
    ADM8692 4.4V 35 Active-Low/Push-Pull Yes --- 100, 1,600 DIP, SOIC µP Supv w/ Backup Battery Switch, Watchdog, Power Fail Flag, 4.4V Vth, Active Low Reset, 100mA Iout $2.72
    ADM8693 4.4V 35 (Adjustable) Active-High/Push-Pull, Active-Low/Push-Pull Yes Yes 100, 1,600, adj. DIP, SOIC, SOP µP Supervisor w/ Backup Battery Switching, Watchdog, Pwr Fail Flag, 4.4V Vth, 100mA Iout $2.72
    ADM800 4.4V & 4.65V 140 (Adjustable) Active-High/Open-Drain, Active-Low/Push-Pull Yes Yes 100, 1,600, adj. DIP, SOIC µP Supv w/ Backup Battery Switchover, Adj Reset &Watchdog Periods, CE Inputs, 4.4V/4.65V Threshold $2.33
    ADM802 4.4V & 4.65V 140 Active-Low/Push-Pull Yes --- 1,600 DIP, SOIC µP Supv w/ Backup Battery Switchover, Power Fail Flag, 4.4V/4.65V Threshold, 250mA Output Current $2.23
    ADM805 4.4V & 4.65V 140 Active-High/Push-Pull Yes --- 1,600 DIP, SOIC µP Supv w/ Backup Battery Switchover, Watchdog, Power Fail Flag, 4.4V/4.65V Threshold, 250mA Iout $2.23
    ADM690 4.65V 35 Active-Low/Push-Pull Yes --- 100, 1,600 DIP Supervisory Circuit w/ 4.65V Reset, Battery Switchover, Watchdog Timer, Power Fail Input $2.42
    ADM690A 4.65V 140 Active-Low/Push-Pull Yes --- 1,600 DIP, SOIC, SOP µP Supervisor with Backup-Battery Switchover, Watchdog Feature, Power-Fail Warning, 4.65V Threshold </