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BUY DS3231S https://www.utsource.net/itm/p/420328.html
Extremely Accurate I2C-Integrated RTC/TCXO/Crystal
Description: The DS3231S is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. Features: Extremely Accurate I2C RTC with Integrated TCXO ±2ppm Accuracy from 0°C to +40°C ±3.5ppm Accuracy from -40°C to +85°C ±4ppm Accuracy from -40°C to +125°C Operating Voltage Range: 1.14V to 5.5V Low Power Consumption: 0.4μA at 1.8V and 3.3V I2C Interface Programmable Square-Wave Output Temperature Sensor Automatic Power-Fail Detect and Switch Circuit Available in SOP16 Package Applications: Wearable Devices Home Automation Industrial Automation Medical Devices Automotive Networking Security Systems Smart Meters (For reference only)