BUY DS3231S#T&R https://www.utsource.net/itm/p/7307890.html
Real Time Clock (RTC) IC Clock/Calendar I2C, 2-Wire Serial 16-SOIC (0.295", 7.50mm Width)
The DS3231S#T&R is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. It is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. The device includes a battery input, and maintains accurate timekeeping when main power to the device is interrupted. The DS3231S#T&R is available in a 16-pin SOIC (0.295", 7.50mm width) package. Features: * Low-power consumption: 0.4μA in battery-backup mode * I2C interface * Programmable square-wave output * Temperature-compensated crystal oscillator (TCXO) * ±2ppm accuracy from 0°C to +40°C * ±3.5ppm accuracy from -40°C to +85°C * ±2.5ppm accuracy from -40°C to +125°C * Battery-backup input for continuous timekeeping * 56 bytes of nonvolatile SRAM Applications: * Automotive * Industrial * Consumer * Medical * Wearables * IoT (For reference only)