Real time clock module, What Is A Real Time Clock - tatanh1983/conchodom GitHub Wiki

ISL1208 Series 2.7 - 5.5 V 2 Byte Ram I2C® Real Time Clock/Calendar - SOIC-8

https://www.futureelectronics.com/p/semiconductors%E2%80%94real-time-clocks/isl1208ib8z-tk-renesas-5027802