General Description
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 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 sup
   ply 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.

FEATUREs
♦ µMAX 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 µP Power Monitoring