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M41T01：Serial real-time clock (RTC) with built-in battery switchover circuit

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

产品规格

应用手册

手册

Clocks and Timers Software

样片和购买

质量和可靠性