MAX705ESA+T

The MAX705–MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices signifcantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX705/MAX706/MAX813L provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds. 3) A 1.25V threshold detector for power-fail warning, lowbattery detection, or for monitoring a power supply other than +5V. 4) An active-low manual-reset input. The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of RESET. Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/ MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO, and μMAX packages.

Applications

• Computers
• Controllers
• Intelligent Instruments
• Critical μP Power Monitoring

Key features

• Supervisory-Function Integration Significantly Improves System Reliability While Reducing Board Space
• μMAX Package
• Guaranteed RESET Valid at VCC = 1V
• 200ms Reset Pulse Width
• Debounced TTL/CMOS-Compatible ManualReset Input
• Active-High Reset Output (MAX707/MAX708/ MAX813L)
• Precision-Supply Voltage Monitor
• 4.65V (MAX705/MAX707/MAX813L)
• 4.40V (MAX706/MAX708)
• Voltage Monitor for Power-Fail or Low-Battery Warning