Serial real-time clock (RTC) with built-in battery switchover circuit

Quantity $ per Unit Savings
1 - 9$3.740%
10 - 24$3.3610%
25 - 60$3.1815%
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Parameter NameParameter Value
Supply Voltage Min Volt2.0
Supply Voltage Max Volt5.5
Operating Temp Min Celsius-40.0
Operating Temp Max Celsius85.0
Packing TypeTape And Reel
RoHs compliantEcopack1
Package NameSO-8

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.

Key features
  • 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