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ADM694AN µP SUPERVISOR WITH BACKUP BATTERY SWITCHOVER, WATCHDOG FEATURE, POWER FAIL WARNING, 4.65V THRESHOLD VOLTAGE, ACTIVE LOW RESET AND 100MA OUTPUT CURRENT


source: | post time:2010-02-15

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
  • Pricing, Packaging & Availability

    Model Status Package Pins Temp.
    Range
    Price*
    (100-499)
    Price*
    (1000 pcs.)
    Production**
    Availability
    ROHS Compliant
    ADM694AN Prodn 8 ld PDIP 8 Ind $3.40 $2.92 02/12/2010 N  Material Declaration
    ADM694ANZ Prodn 8 ld PDIP 8 Ind $2.94 $2.53 04/30/2010 Y  Material Declaration
    ADM694SQ Prodn CERDIP GLASS SEAL 8 Mil $6.65

    Functional Block Diagram for ADM694

    ADM694 Diagram 

     

    source:ShenZhen henlito electronic co.,ltd.

    web:www.henlito.com


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