SUMMARY DESCRIPTION
The M41T80 Serial Access TIMEKEEPER® SRAM is a low power Serial RTC with a built-in 32.768 KHz oscillator (external crystal controlled). Eight registers (see Table 8, page 13) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 registers provide status/control of Alarm, 32kHz output, and Square Wave functions. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.
   
FEATURES SUMMARY
■ 2.0 TO 5.5V CLOCK OPERATING VOLTAGE
■ COUNTERS FOR TENTHS/HUNDREDTHS
    OF SECONDS, SECONDS, MINUTES,
    HOURS, DAY, DATE, MONTH, YEAR, and
    CENTURY
■ SERIAL INTERFACE SUPPORTS I2C BUS
    (400KHz)
■ PROGRAMMABLE ALARM and INTERRUPT
    FUNCTION
■ LOW OPERATING CURRENT OF 200µA
■ OPERATING TEMPERATURE OF –40 TO
    85°C