The Renesas Electronics ISL12026 devices are micro power real time clocks with timing and crystal compensation, clock/calendar, power-fail indicator, two periodic or polled alarms, intelligent battery backup switching, and integrated 512x8-bit EEPROM configured in 16 bytes per page.

Real time clock/calendar
Selectable frequency outputs
Two non-volatile alarms
Settable on the second, minute, hour, day of the week, day or month
Repeat mode (Periodic Interrupts)
512x8 Bits of EEPROM
High reliability
Data retention 50 years
Endurance >2,000,000 cycles per byte