M41T81 Datasheet - ST Microelectronics

M41T81 Serial access real-time clock

The M41T81 is a low-power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/control of alarm, watchdog.

M41T81 Features

* For all new designs use M41T81S

* Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century

* 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance ope

M41T81_STMicroelectronics.pdf