Outline
This IC combines the popular watchdog timer with a battery back-up, resulting in an IC that is easier to use. The watchdog timer has a built-in power ON reset function, and both the timer and the battery back-up section have low current consumption.

Features
1. Low current consumption 270µA typ.
2. Watchdog timer
   Detection voltage 4.2V typ.
   CT charging current -0.24µA typ.
3. CS
   CS detection voltage 4.4V typ.
   Output voltage low level 0.1V typ.
4. Battery back-up
   Power supply switching voltage 3.3V typ.
   Input/output voltage difference (normal) 0.3V typ.
   Input/output voltage difference (back-up) 0.3V typ.
   Loss current (current consumption for back-up) 0.1µA typ.

Applications
1. Fax machines
2. Photocopiers
3. Air conditioners
4. Control equipment
5. Sequencers, etc.