MB3793-34A
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 is cut or falls abruptly. When the power recovers normally after resetting, a power-on reset
signal is output to microprocessor units (MPUs). An internal 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
MB3793-34A 3793AJ 3.4 V
Features
Precise detection of power voltage fall: 2.5 %
Detection voltage with hysteresis
Low power dispersion: I = 38 A (Typ)
CC
Internal dual-input watchdog timer
Watchdog timer halt function
Independently-set watchdog and reset times
Application
Arcade Amusement etc.
Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600
Document Number: 002-08556 Rev. *C Revised June 20, 2017 MB3793-34A
Contents
Description ................................................................... 1 9. Operation Sequence ............................................ 14
Features ....................................................................... 1 9.1 Positive Clock Pulse Input ............................. 14
Application ................................................................... 1 9.2 Negative Clock Pulse Input ............................ 14
9.3 Single-clock Input Monitoring ......................... 14
1. Pin Assignment ...................................................... 3
9.4 Description of Operations .............................. 14
2. Pin Description ....................................................... 3
10. Typical Characteristics ...................................... 16
3. Block Diagram ........................................................ 4
11. Application Example .......................................... 19
4. Block Functions ..................................................... 5
11.1 Supply Voltage Monitor and Watchdog
5. Absolute Maximum Ratings .................................. 6
Timer ..................................................................... 19
6. Recommended Operating Conditions .................. 6
11.2 Supply Voltage Monitor and Watchdog
7. Electrical Characteristics ...................................... 7
Timer Stop ............................................................. 20
7.1 DC Characteristics ........................................... 7
11.3 Setting of Compulsory Reset ...................... 20
7.2 AC Characteristics ........................................... 8
12. Usage Precaution ............................................... 21
8. Timing Diagram ...................................................... 9
13. Ordering Information ......................................... 21
8.1 Basic Operation (Positive clock pulse) ............. 9
14. RoHS Compliance Information ......................... 21
8.2 Basic Operation (Negative clock pulse) ......... 10
15. Package Dimensions ......................................... 22
8.3 Single-clock Input Monitoring (Positive Clock
Document History ..................................................... 23
Pulse) .................................................................... 11
Sales, Solutions, and Legal Information ................. 24
8.4 Inhibition Operation (Positive Clock Pulse) .... 12
8.5 Clock Pulse Input Supplementation (Positive
Clock Pulse) .......................................................... 13
Document Number: 002-08556 Rev. *C Page 2 of 24