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General Description

The MAX6826–MAX6831 are ultra-low-voltage microprocessor (μP) supervisory circuits designed to monitor two power supplies and have manual reset and watchdog input functions. These devices assert a system reset if any of the monitored supplies fall below the preprogrammed thresholds, and maintain reset for a minimum timeout period after the supplies rise above the threshold. Microprocessor supervisors significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices monitor primary voltages from +1.8V to +5.0V and secondary voltages from +0.9V to +2.5V. These devices are guaranteed to be in the correct state for VCC down to +1.0V.

Features

● Monitor Primary VCC Supplies from +1.8V

?? to +5.0V and Secondary VCC2 Supplies

?? from +0.9V to +2.5V

● User Adjustable RESET IN Down to +0.63V

?? (MAX6826/MAX6827/MAX6828)

● 140ms (min) Reset Timeout Delay

● 1.6s Watchdog Timeout Period

● Manual Reset Input

● Three Reset Output Options

?? Push-Pull RESET

?? Push-Pull RESET

?? Open-Drain RESET

● Guaranteed Reset Valid Down to VCC = +1.0V

● Immune to Short Negative VCC Transients

● No External Components

● Small 6-pin SOT23 Packages

Applications

● Portable/Battery Powered Equipment

● Embedded Controllers

● Intelligent Instruments

● Critical μP Monitoring

● Multivoltage Systems