MB3793-34D/37D/40D/42D/45D
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
MB3793-34D 3793DJ 3.4 V
MB3793-37D 3793DF 3.7 V
MB3793-40D 3793DC 4.0 V
MB3793-42D 3793DA 4.2 V
MB3793-45D 3793D7 4.5 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 : SOP8
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: 002-08399 Rev *C Revised June 27, 2017
MB3793-34D/37D/40D/42D/45D
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: 002-08399 Rev *C Page 2 of 24