The M41T0 real-time clock is a low power serial real-time clock with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers 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 M41T0 is supplied in 8-lead plastic small outline package.Counters for seconds, minutes, hours, day, date, month, years, and century32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operationOscillator stop detection monitors clock operationSerial interface supports I²C bus (400 kHz protocol)Low standby current 0.9 µA (typ at 3 V)2.0 to 5.5 V clock operating voltageSpecial software programmable outputOperating temperature of –40 to 85 °C