• Low power consumption: 210 nA @ 3 V.
  • Wide operating voltage range: 0.9 V to 5.5 V.
  • Time accuracy: ±20 ppm @ 25°C.
  • 3.0 V Regulated Output for ML rechargeable batteries (VREG).
  • Level shifter for peripherals (VIO).
  • User programmable offset value.
  • Automatic Backup switchover function and VBAT monitoring.
  • Provides year, month, date, weekday, hours, minutes and seconds.
  • I2C-bus interface: 400 kHz.
  • Automotive qualification according to AEC-Q200 available.

Block Diagram


  • IoT
  • Wearables, Portables
  • Health Care
  • Metering
  • Industrial
  • Automotive


Ordering Information

RV-2251-C3 a CMOS Real-Time Clock/Calendar Module with an automatic backup switchover circuit and a voltage detector. An Offset register allows compensating the frequency deviation of the 32.768 kHz clock. All addresses and data are transferred over an I2C-bus interface for communication with a host controller. The Address Pointer is incremented automatically after each written or read data byte. The low power consumption can even be lowered by selecting the ECO mode. 3.0 V ML rechargeable batteries can be directly connected to the RV-2251-C3.