MB3773 Power Supply Monitor with Watch-Dog Timer Description MB3773 generates the reset signal to protect an arbitrary system when the power-supply voltage momentarily is intercepted or decreased. It is IC for the power-supply voltage watch and Power on reset is generated at the normal return of the power supply. MB3773 sends the microprocessor the reset signal when decreasing more than the voltage, which the power supply of the system specified, and the computer data is protected from an accidental deletion. In addition, the watch-dog timer for the operation diagnosis of the system is built into, and various microprocessor systems can provide the fail-safe function. If MB3773 does not receive the clock pulse from the processor for a specified period, MB3773 generates the reset signal. Features Precision voltage detection (V = 4.2 V 2.5%) S Detection threshold voltage has hysteresis function Low voltage output for reset signal (V = 0.8 V Typ) CC Precision reference voltage output (V = 1.245 V 1.5%) R With built-in watch-dog timer of edge trigger input. External parts are few.(1 piece in capacity) The reset signal outputs the positive and negative both theories reason. One type of package (SOP-8pin : 1 type) Application Industrial Equipment Arcade Amusement etc. Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 002-08513 Rev. *C Revised June 28, 2017 MB3773 Contents Description ............................................................................. 1 7.1 DC Characteristics ..................................................... 8 Features .................................................................................. 1 7.2 AC Characteristics ...................................................... 9 Application ............................................................................. 1 8. Typical Characteristic Curves ........................................ 10 Contents ................................................................................. 2 9. Application Circuit ........................................................... 13 1. Pin Assignment ................................................................. 3 10. Notes on Use .................................................................. 25 2. Block Diagram ................................................................... 3 11. Ordering Information ..................................................... 25 3. Functional Descriptions .................................................... 4 12. RoHS Compliance Information of Lead (Pb) 4. Operation Sequence .......................................................... 6 Free version ......................................................................... 25 5. Absolute Maximum Ratings ............................................ 7 13. Package Dimension ....................................................... 26 6. Recommended Operating Conditions ............................. 7 Document History ................................................................ 27 7. Electrical Characteristics .................................................. 8 Sales, Solutions, and Legal Information ...........................28 Document Number: 002-08513 Rev. *C Page 2 of 28