MAX6821 Datasheet | Maxim Integrated

Click here for production status of specific part numbers. MAX6821/MAX6825 Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer General Description The MAX6821- MAX6825 are low-voltage microprocessor (µP) supervisory circuits that bine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. Microprocessor supervisory circuits significantly improve system reliability and accuracy pared to separate ICs or discrete ponents. 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. Nine preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The MAX6821, MAX6822, and MAX6823 all have a manual reset input and a watchdog timer. The MAX6821 has push-pull RESET, the MAX6822 has open-drain RESET, and the MAX6823 has push-pull RESET. The MAX6824 has a watchdog timer and both push-pull RESET and push-pull RESET. The MAX6825 has a manual reset input and both push-pull RESET and push-pull RESET. The Selector Guide explains the functions offered in this series of parts. Applications - - Set-Top Boxes - - puters and Con- trollers - - Embedded Controllers - - Intelligent Instruments - - Critical µP Monitoring - - Portable/Battery- Powered Equipment Pin Configurations TOP VIEW RESET(RESET) 1 GND 2 MAX6821 MAX6822 MAX6823 5 VCC MR 3 4 WDI (RESET) MAX6821 ONLY SOT23-5 Pin Configurations continued at end of data sheet. Typical Operating Circuit appears at end of data sheet. Features - - Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V Supplies - - 140ms (min) Reset Timeout Delay - - 1.6s Watchdog Timeout Period...