General Description The MAX705-MAX708/MAX813L microprocessor (uP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly 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, low-battery 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 uMAX packages.
Features uMAX Package: Smallest 8-Pin SO Guaranteed RESET Valid at VCC = 1V Precision Supply-Voltage Monitor 4.65V in MAX705/MAX707/MAX813L 4.40V in MAX706/MAX708 200ms Reset Pulse Width Debounced TTL/CMOS-Compatible Manual-Reset Input Independent Watchdog Timer—1.6sec Timeout (MAX705/MAX706) Active-High Reset Output (MAX707/MAX708/MAX813L) Voltage Monitor for Power-Fail or Low-Battery Warning
Applications Computers Controllers Intelligent Instruments Automotive Systems Critical uP Power Monitoring
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