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MAX807L, MAX807M, MAX807N

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

Product Details

Key Features

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
4.5 to 5.0
Reset Out Active High
Active Low
Push-Pull
ICC (µA) (max) 110
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (W)/16
TSSOP/16
Budgetary
Price (See Notes)
3.7
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
4.5 to 5.0
Reset Out Active High
Active Low
Push-Pull
ICC (µA) (max) 110
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (W)/16
TSSOP/16
Budgetary
Price (See Notes)
3.7

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

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.
  • Simplified Block Diagram

    MAX807L, MAX807M, MAX807N: Typical Operating Circuit MAX807L, MAX807M, MAX807N: Typical Operating Circuit Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .