RV-1805-C3 Not recommended for new design-in, please use RV-3028-C7 for new design

RV-1805-C3 Real Time Clock with Power Management provides a groundbreaking combination of ultra-low power coupled with a highly sophisticated feature set. The power requirement is significantly lower than any other industry RTC (as low as 17 nA). The RV-1805-C3 includes an on-chip oscillator to provide a minimum power consumption, full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions, and either an I²C serial interface for communication with a host controller. An integrated power switch and a sophisticated system sleep manager with counter, timer, alarm, and interrupt capabilities allows the RV-1805-C3 to be used as a supervisory component in a host microcontroller based system.


  • Extreme low power consumption: XTAL mode, 60 nA @ 3 V.
  • RC mode, 17 nA @ 3 V. RC autocalibration mode, 22 nA @ 3 V.
  • Operating voltage range: 1.5 V to 3.6 V.
  • Time accuracy: Factory calibrated to ±2 ppm @ 25°C.
  • User programmable offset value.
  • Automatic Backup Switchover and Trickle Charger function.
  • Provides year, month, date, weekday, hours, minutes, seconds, 100th.
  • Timer, Alarm, External event and Watchdog functions.
  • Clock output frequencies: 32.768 kHz to 1/60 Hz.
  • 256 bytes user RAM.

Block Diagram


The RV-1805-C3 RTC module has been specially designed for ultimate low power consumption:

  • IoT
  • Wearables, Portables
  • Health Care
  • Metering
  • Industrial
  • Key element for power management


Ordering Information