MAX805L

 

Part Number	Replacement	Explanation

Description

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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.

The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of active-low RESET.

All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.

MAX690A, MAX692A, MAX802L, MAX802M, MAX805L: Typical Operating Circuit Enlarge+

Key Features

• Precision Supply Voltage Monitor:
  • 4.65V for MAX690A/MAX802L/MAX805L
  • 4.40V for MAX692A/MAX802M
• Reset Time Delay: 200ms
• Watchdog Timer: 1.6s 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 Active-Low RESET Assertion to V_CC = 1V
• 8-Pin SO and DIP Packages

Applications/Uses

• Battery-Powered Computers/Controllers
• Critical µP Monitoring
• Intelligent Instruments