RTC, 31x 8 RAM, SPI2.0v - 5.0v, 6pF
RTC, 56 x 8 NV, I2C4.5v - 5.5v, 12.5pF
RTC, I2C, Alarm1.8v - 5.5v. 12.5pF
RTC, SPI2.0v - 5.0v, 6pF
