MAX807L

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy


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Description

The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suitable for larger, higher-performance equipment.

The MAX807 comes in 16-pin DIP, SO, and TSSOP packages, and provides the following functions:
  • µP reset. The active-low RESET output is asserted during power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V.
  • Active-high RESET output.
  • Manual-reset input.
  • Two-stage power-fail warning. A separate low-line comparator compares VCC to a threshold 52mV above the reset threshold. This low-line comparator is more accurate than those in previous µP supervisors.
  • Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.
  • Write protection of CMOS RAM or EEPROM.
  • 2.275V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.
  • BATT OK status flag indicates that the backup-battery voltage is above +2.275V.
  • Watchdog-fault output—asserted if the watchdog input has not been toggled within a preset timeout period.
  • MAX807L, MAX807M, MAX807N: Typical Operating Circuit MAX807L, MAX807M, MAX807N: Typical Operating Circuit Enlarge+

    Key Features

    • Precision 4.675V (MAX807L), 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring
    • 200ms Power-OK/Reset Time Delay
    • RESET-bar and RESET Outputs
    • Independent Watchdog Timer
    • 1µA Standby Current
    • Power Switching
      • 250mA in VCC Mode
      • 20mA in Battery-Backup Mode
    • On-Board Gating of Chip-Enable Signals;
      • 2ns CE Gate Propagation Delay
    • MaxCap® and SuperCap Compatible
    • Voltage Monitor for Power Fail
    • Backup-Battery Monitor
    • Guaranteed active-low RESET Valid to VCC = 1V
    • ±1.5% Low-Line Threshold Accuracy 52mV above Reset Threshold

    Applications/Uses

    • Computers: Desktop, Workstation, Server
    • Controllers
    • Critical µP Monitoring
    • Intelligent Instruments
    • Portable Battery-Powered Equipment
    Part NumberReset Thresh.
    (V)
    Reset OutICC
    (µA)
    Oper. Temp.
    (°C)
    Package/PinsBudgetary
    Price
    maxSee Notes
    MAX807 
    4.0 to 4.5
    4.5 to 5.0
    Active High
    Active Low
    Push-Pull
    110
    -55 to +125
    -40 to +85
    0 to +70
    PDIP/16
    SOIC (W)/16
    TSSOP/16
    $3.32 @1k
    See All Battery Backup Circuits (81)
    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Quality and Environmental Data

    Request Reliability Report for: MAX807L 
    Lead-Free Package Tin (Sn) Whisker Reports
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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