Accurate RTC with integrated quartz crystal for industrial applications

The PCF2129 is a CMOS Real Time Clock (RTC) and calendar with an integratedTemperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartzcrystal optimized for very high accuracy and very low power consumption. The PCF2129has a selectable I2C-bus or SPI-bus, a backup battery switch- Operating temperature range from -40 °C to +85 °C\nTemperature Compensated Crystal Oscillator (TCXO) with integrated capacitors\nTypical accuracy:PCF2129AT: ±3 ppm from -15 °C to +60 °C\nPCF2129T: ±3 ppm from -30 °C to +80 °C\nIntegration of a 32.768 kHz quartz crystal and oscillator in the same pac;

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