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MAX8997 Datasheet PDF : Supervisory Circuits MAX8997EWW+

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GENERAL DESCRIPTION
The ADM8690–ADM8695 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

FEATURES
   Upgrade for ADM690/ADM695, MAX690–MAX695
   Specified Over Temperature
   Low Power Consumption (0.7 mW)
   Precision Voltage Monitor
   Reset Assertion Down to 1 V VCC
   Low Switch On-Resistance 0.7 Ω Normal,
      7 Ω in Backup
   High Current Drive (100 mA)
   Watchdog Timer—100 ms, 1.6 s, or Adjustable
   400 nA Standby Current
   Automatic Battery Backup Power Switching
   Extremely Fast Gating of Chip Enable Signals (3 ns)
   Voltage Monitor for Power Fail
   Available in TSSOP Package

APPLICATIONS
   Microprocessor Systems
   Computers
   Controllers
   Intelligent Instruments
   Automotive Systems

General Description
The MAX690 family of Supervisory Circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accuracy compared to that obtainable with separate ICs or discrete components.

Benefts and Features
● Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
    • Precision Voltage Monitor
        - 4.65V (MAX690, MAX691, MAX694, MAX695)
        - 4.40V (MAX692, MAX693)
    • Power OK/Reset Time Delay
        - 50ms, 200ms, or Adjustable
    • Watchdog Timer
        - 100ms, 1.6s, or Adjustable
    • Battery Backup Power Switching
    • Voltage Monitor for Power Fail or Low Battery Warning
    • Minimum External Component Count
● Low Power Consumption in Battery Backup Mode Extends Battery Life
    • 1µA Standby Current
● Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low VCC Events

Applications
● Computers
● Controllers
● Intelligent Instruments
● Automotive Systems
● Critical µP Power Monitoring

General Description
The MAX696/MAX697 Supervisory Circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (μP) systems. These include μP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX696/MAX697 significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components.

Features
● Adjustable Low-Line Monitor and Power-Down Reset
● Power-OK/Reset Time Delay
● Watchdog Timer—100ms, 1.6s, or Adjustable
● Minimum Component Count
● 1μA Standby Current
● Battery-Backup Power Switching (MAX696)
● On-Board Gating of Chip-Enable Signals (MAX697)
● Separate Monitor for Power-Fail or Low-Battery Warning

Applications
● Computers
● Controllers
● Intelligent Instruments
● Critical μP Power Monitoring

General Description
The MAX691A/MAX693A/MAX800L/MAX800M microprocessor (µP) Supervisory Circuits are pin-compatible upgrades to the MAX691, MAX693, and MAX695. They improve performance with 30µA supply current, 200ms typ reset active delay on power-up, and 6ns chipenable propagation delay. Features include write protection of CMOS RAM or EEPROM, separate watchdog outputs, backup-battery switchover, and a RESET output that is valid with VCC down to 1V. The MAX691A/ MAX800L have a 4.65V typical reset-threshold voltage, and the MAX693A/MAX800M’s reset threshold is 4.4V typical. The MAX800L/MAX800M guarantee power-fail accuracies to ±2%

Features
♦ 200ms Power-OK/Reset Timeout Period
♦ 1µA Standby Current, 30µA Operating Current
♦ On-Board Gating of Chip-Enable Signals, 10ns Max Delay
♦ MaxCap™ or SuperCap™ Compatible
♦ Guaranteed RESET Assertion to VCC = +1V
♦ Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Power-Fail Accuracy Guaranteed to ±2% (MAX800L/M)
♦ Available in 16-Pin Narrow SO and Plastic DIP Packages

Applications
   Computers
   Controllers
   Intelligent Instruments
   Automotive Systems
   Critical µP Power Monitoring

General Description
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. These parts provide four functions:

1) A reset output during power-up, power-down, and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic.
3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec.
4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V.

Features
♦ Precision Supply-Voltage Monitor: 4.65V for MAX690A/MAX802L/MAX805L  4.40V for MAX692A/MAX802M
♦ Reset Time Delay – 200ms
♦ Watchdog Timer – 1.6sec Timeout
♦ Battery-Backup Power Switching
♦ 200µA Quiescent Supply Current
♦ 50nA Quiescent Supply Current in Battery Backup Mode
♦ Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M)
♦ Guaranteed RESETAssertion to VCC= 1V
♦ 8-Pin SO and DIP Packages

Applications
 Battery-Powered Computers and Controllers
 Intelligent Instruments
 Automotive Systems
 Critical µP Power Monitoring

Description
The MIC705/MIC706/MIC707/MIC708 are inexpensive microprocessor Supervisory Circuits that monitor power supplies in microprocessor based systems. The circuit functions include a watchdog timer, microprocessor reset, power failure warning and a debounced manual reset input.

Features
◾ Debounced Manual Reset Input is TTL/CMOS Compatible
◾ Reset Pulse Width, 200ms
◾ Watchdog Timer, 1.6s (MIC705/MIC706)
◾ 4.4V or 4.65V Precision Voltage Monitor
◾ Early Power Fail Warning or Low Battery Detect

Typical Applications
◾ Automotive Systems
◾ Intelligent Instruments
◾ Critical Microprocessor Power Monitoring
◾ Printers
◾ Computers
◾ Controllers

GENERAL DESCRIPTION
The ADM8690–ADM8695 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.

FEATURES
   Upgrade for ADM690/ADM695, MAX690–MAX695
   Specified Over Temperature
   Low Power Consumption (0.7 mW)
   Precision Voltage Monitor
   Reset Assertion Down to 1 V VCC
   Low Switch On-Resistance 0.7 Ω Normal,
      7 Ω in Backup
   High Current Drive (100 mA)
   Watchdog Timer—100 ms, 1.6 s, or Adjustable
   400 nA Standby Current
   Automatic Battery Backup Power Switching
   Extremely Fast Gating of Chip Enable Signals (3 ns)
   Voltage Monitor for Power Fail
   Available in TSSOP Package

APPLICATIONS
   Microprocessor Systems
   Computers
   Controllers
   Intelligent Instruments
   Automotive Systems

General Description
The MAX691A/MAX693A/MAX800L/MAX800M microprocessor (µP) Supervisory Circuits are pin-compatible upgrades to the MAX691, MAX693, and MAX695. They improve performance with 30µA supply current, 200ms typ reset active delay on power-up, and 6ns chip enable propagation delay. Features include write protection of CMOS RAM or EEPROM, separate watchdog outputs, backup-battery switchover, and a RESET output that is valid with VCC down to 1V. The MAX691A/MAX800L have a 4.65V typical reset-threshold voltage, and the MAX693A/MAX800M’s reset threshold is 4.4V typical. The MAX800L/MAX800M guarantee power-fail accuracies to ±2%.

Features
♦ 200ms Power-OK/Reset Timeout Period
♦ 1µA Standby Current, 30µA Operating Current
♦ On-Board Gating of Chip-Enable Signals, 10ns Max Delay
♦ MaxCap™ or SuperCap™ Compatible
♦ Guaranteed RESET Assertion to VCC = +1V
♦ Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Power-Fail Accuracy Guaranteed to ±2% (MAX800L/M)
♦ Available in 16-Pin Narrow SO and Plastic DIP Packages

Applications
  Computers
  Controllers
  Intelligent Instruments
  Automotive Systems
  Critical µP Power Monitoring

GENERAL DESCRIPTION
The ADM690A/ADM692A/ADM802L/M/ADM805L/M 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, and power failure warning.
   
FEATURES
    Precision Supply Voltage Monitor
    4.65 V ADM690A/ADM802L/ADM805L
    4.40 V ADM692A/ADM802M/ADM805M
    Reset Assertion Down to 1 V VCC
    Reset Timeout—200 ms
    Watchdog Timer—1.6 s
    100 μA Quiescent Supply Current
    Automatic Battery Backup Power Switching
    Voltage Monitor for Power Fail
    ±2% Power Fail Accuracy on ADM802L/M
    Space-Saving MicroSOIC Package (ADM690A)
   
APPLICATIONS
    Microprocessor Systems
    Computers
    Controllers
    Intelligent Instruments