MB3793-27D/28D/30D Power-Voltage Monitoring IC with Watchdog Timer Description The MB3793 is an integrated circuit to monitor power voltage it incorporates a watchdog timer. A reset signal is output when the power supply voltage is cut or falls instantaneously. When the power supply recovers normally after resetting, a power-on reset signal is output to monitor the power supply voltage. A built-in watchdog timer with two inputs for system operation diagnosis can provide a fail-safe function for various application systems. Model No. Marking Code Detection Voltage MB3793-27D 3793DY 2.7 V MB3793-28D 3793DR 2.8 V MB3793-30D 3793DC 3.0 V Features Precise detection of power voltage fall: 2.5% Detection voltage with hysteresis Built-in dual-input watchdog timer Watchdog timer halt function Independently-set watchdog and reset times Open drain output Package : SOP Applications The MB3793 has various uses such as the amusement devices. Online Design Simulation Easy DesignSim This product supports the web-based design simulation tool. It can easily select external components and can display useful information. Please access from the following URL. cypress.transim.com/login.aspx Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 002-08488 Rev.*C Revised June 27, 2017 MB3793-27D/28D/30D Contents Description .............................................................................................................................................................................. 1 Features ................................................................................................................................................................................... 1 Applications ............................................................................................................................................................................ 1 1. Pin Assignment ................................................................................................................................................................. 3 2. Pin Description .................................................................................................................................................................. 3 3. Block Diagram ................................................................................................................................................................... 4 4. Block Functions ................................................................................................................................................................ 5 5. Absolute Maximum Ratings ............................................................................................................................................. 6 6. Recommended Operating Conditions ............................................................................................................................. 6 7. Electrical Characteristics ................................................................................................................................................. 7 7.1 DC Characteristics......................................................................................................................................................... 7 7.2 AC Characteristics ......................................................................................................................................................... 8 8. Timing Diagram ................................................................................................................................................................. 9 9. Operation Sequence ....................................................................................................................................................... 14 10. Typical Characteristics ................................................................................................................................................... 16 11. Application Example ....................................................................................................................................................... 19 12. Usage Precaution ............................................................................................................................................................ 21 13. Ordering Information ...................................................................................................................................................... 21 14. RoHS Compliance Information ...................................................................................................................................... 21 15. Package Dimensions ...................................................................................................................................................... 22 16. Major Changes ................................................................................................................................................................ 23 Document History ................................................................................................................................................................. 23 Sales, Solutions, and Legal Information ............................................................................................................................. 24 Document Number: 002-08488 Rev.*C Page 2 of 24