Real Time Clock Serial (SPI) 8Byte 8-Pin SOIC T/R

The M41T01 is a low-power serial real-time clock (RTC). The built-in 32.768 kHz oscillator circuit works with an external crystal and does not need any load capacitors.The M41T01 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. Eight bytes of the RAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. Addresses and data are transferred serially via a two-line bidirectional bus. The built-in address register is incremented automatically after each WRITE or READ data byte. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium coin cell.Typical data retention time is in excess of 5 years with a 50 mA/h 3 V lithium cell. The M41T01 is supplied in an 8-lead plastic small outline package.

2.0 to 5.5 V clock operating voltage

Counters for seconds, minutes, hours, day, date, month, years, and century

Software clock calibration

Automatic switchover and deselect circuitry

Ultra-low battery supply current of 800 nA

Low operating current of 300 µA

Battery and capacitor backup

Battery backup not recommended for 3.0 V applications (capacitor backup only)

Operating temperature of –40 to 85 °C

Automatic leap year compensation