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MAX8997 Datasheet PDF : Supervisory Circuits MAX8997EWW+

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The MAX707/708 are cost−effective system supervisor Circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required.
The reset output is driven active within 20 sec of VCC falling through the reset voltage threshold. Reset is maintained with 200 mS of delay time after VCC rise above the reset threshold. The MAX707/708 have a low quiescent current of 12 μA at VCC = 3.3 V, an active−high RESET and active−low RESET with a push−pull output. The output is guaranteed valid down to VCC = 1.0 V. The MAX707/708 have a Manual Reset MR input and a +1.25 V threshold detector for power−fail input PFI. These devices are available in a Micro8 and SOIC−8 package.

Features
• Precision Supply−Voltage Monitor MAX707: 4.63 V Reset Threshold Voltage
   MAX708: Standard Reset Threshold Voltages (Typical): 4.38 V, 3.08 V, 2.93 V, 2.63 V
• Reset Threshold Available from 1.6 V to 4.9 V with 100 mV Increments (Factory Option)
• 200 mS (Typ) Reset Timeout Delay
• 12μA (VCC = 3.3 V) Quiescent Current
• Active_High and Active_Low Reset Output
• Guaranteed RESET_L and RESET Output Valid to VCC = 1.0 V
• Voltage Monitor for Power−Fail or Low−Battery Warning
• 8 Pin SOIC or Micro8 Package
• Pb−Free Packages are Available

Applications
• Computers
• Embedded System
• Battery Powered Equipment
• Critical P Power Supply Monitor

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 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 ADM869x family of Supervisory Circuits offers complete single- chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include microprocessor 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 to ADM695, MAX690 to 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 ADM698/ADM699 Supervisory Circuits provide power supply monitoring and watchdog timing for microprocessor systems.
The ADM698 monitors the 5 V VCC power supply and gener ates a RESET pulse during power up, power down and during low voltage “Brown Out” conditions. The RESET output is guaranteed to be functional (logic low) with VCC as low as 1 V.

FEATURES
  Superior Upgrade for MAX698/MAX699
  Guaranteed RESET Assertion with VCC = 1 V
  Low 0.6 mA Supply Current
  Precision 4.65 V Voltage Monitor
  Power OK/Reset Time Delay
  Watchdog Timer
  Minimum Component Count
  Performance Specified over Temperature
 
APPLICATIONS
  Microprocessor Systems
  Computers
  Controllers
  Intelligent Instruments
  Automotive Systems
  Critical mP Power Monitoring

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 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 CAT705, CAT706, and CAT813 provide reset and monitoring functions for the electronic systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer allows the system power supply to stabilize.

The CAT705, CAT706, and CAT813 have a watchdog input which can be used to monitor a system signal and cause a reset to be issued if the signal fails to change state prior to a timeout condition.

FEATURES

■ Accurate under voltage system monitoring

■ RESET guaranteed valid for VCC = 1.0V

■ 6µA supply current

■ 200ms RESET pulse width

■ Watchdog timer function 1.6 sec timeout

■ Brownout detection system reset for use with 3.0, 3.6, and 5.0 volt systems

■ Pin and function compatible with the MAX705/706/813L products

■ Operating Range from -40°C to +85°C

■ Available in SOIC 8-lead and MSOP 8-lead packages

APPLICATIONS

■ Microprocessor and microcontroller based systems

■ Intelligent instruments

■ Control systems

■ Critical µP monitors

■ Portable equipment