M41T80

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 1_² registers M41T80 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 M41T80 is incremented automatically after each WRITE or READ data byte.

Functions of M41T80 available to the user include a time-ofday clock/calendar, Alarm interrupts, 32kHz output, and rogrammable Square Wave output. The eight clock address locations M41T80 contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24 hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41T80 is supplied in an 8-pin SOIC.