Outline
These ICs were developed for STATIC-RAM (S-RAM) battery back-up, and have built-in switching circuit for main power supply and battery, back-up timing circuit and battery checker.

FEATUREs
1. Battery back-up
  1. Low IC current consumption (loss current) 0.3µA typ.
  2. Drop voltage inside IC (input/output voltage difference) IO=10µA 0.2V typ.
  3. Reverse current (reverse leak current) 0.1µA max.
2. Normal operation
  MM1027
    Drop voltage inside IC (input/output voltage difference) IO=70mA 0.2V typ.
    Output voltage VCC=5V IO=10mA 4.8V typ.
    Current consumption D.CONT OPEN 3.0mA max.
    External transistor drive current 25mA typ.
  MM1081
    Drop voltage inside IC (input/output voltage difference) IO=120mA 0.25V typ.
    Output voltage VCC=5V IO=120mA 4.75V typ.
    Current consumption 350µA max.
    External transistor drive current (for output current increase) 25mA typ.
    TC source current 3.0µA typ.
3. Battery-Vcc switching voltage 3.3V typ.
4. Detection voltage (CS, CS ------------------------------------------------) variable 4.2V typ.
5. Battery checker 1 X type 2.70V typ.
                          N type 2.50V typ.
6. Battery checker 2 X type 2.55V typ.
                           N type 2.35V typ.

APPLICATIONs
1. IC memory cards (RAM cards)
2. PCs, word processors
3. Fax machines, photocopiers, other office equipment
4. Other equipment with S-RAMs (equipment requiring back-up)