MK41T56 Datasheet - STMicroelectronics

DESCRIPTION
The MK41T56 TIMEKEEPER® is a low power 512 bit static CMOS RAM organized as 64 words by 8 bits. A built-in 32.768 kHz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format.
   
■ COUNTERS for SECONDS, MINUTES, HOURS, DAY, DATE, MONTH and YEARS
■ SOFTWARE CLOCK CALIBRATION
■ AUTOMATIC POWER-FAIL DETECT and SWITCH CIRCUITRY
■ I2C BUS COMPATIBLE
■ 56 BYTES of GENERAL PURPOSE RAM
■ ULTRA-LOW BATTERY SUPPLY CURRENT of 500nA
■ OPERATING TEMPERATURE:
    – MK41T56: 0 to 70°C
    – MKI41T56: –40 to 85°C
■ AUTOMATIC LEAP YEAR COMPENSATION