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General Description

The MAX6821–MAX6825 are low-voltage microprocessor (μP) supervisory circuits that combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. Microprocessor supervisory circuits significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices assert a reset signal whenever the monitored voltage drops below its preset threshold, keeping it asserted for a minimum timeout period after VCC rises above the threshold. In addition, a watchdog timer monitors against code execution errors. A debounced manual reset is also available. The MAX6821–MAX6825 monitor voltages from +1.8V to +5.0V. These outputs are guaranteed to be in the correct state for VCC down to +1.0V.

Features

? Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V

?? Supplies

? 140ms (min) Reset Timeout Delay

? 1.6s Watchdog Timeout Period

?? (MAX6821/MAX6822/MAX6823/MAX6824)

? Manual Reset Input

?? (MAX6821/MAX6822/MAX6823/MAX6825)

? Three Reset Output Options

?? Push-Pull RESET

?? Push-Pull RESET

?? Open-Drain RESET

? Guaranteed Reset Valid to VCC = +1.0V

? Immune to Short Negative VCC Transients

? No External Components

? Small 5-Pin SOT23 Packages

Applications

?? Set-Top Boxes

?? Computers and Controllers

?? Embedded Controllers

?? Intelligent Instruments

?? Automotive Systems

?? Critical μP Monitoring

?? Portable/Battery Powered Equipment