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Serial real-time clock with 56 bytes of NVRAM

2.0 to 5.5 V clock operating voltage | 56 bytes of general purpose RAM | SO-8 package

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The M41T11is a low-power serial real time clock with 56 bytes of NVRAM. A built-in 32.768 kHz oscillator (external crystal controlled) and the first 8 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.

• Counters for seconds, minutes, hours, day, date, month, years and century
• 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
• Serial interface supports I2C bus (100 kHz protocol)
• Ultra-low battery supply current of 0.8 μA (typ. at 3 V)
• 2.0 to 5.5 V clock operating voltage
• Automatic switchover and deselect circuitry
• 56 bytes of general purpose RAM
• Software clock calibration to compensate crystal deviation due to temperature
• Automatic leap year compensation
• Operating temperature of –40 to 85°C

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