The XO2520BM-ULP-32.768KHz from Dynamic Engineers is a Low Power Crystal Oscillator that operates at 32.768 kHz. It has a frequency stability of ±25-50 ppm with a rise/fall time of up to 10 ns (duty cycle, 55%) and a startup time of less than 8 ms. It requires a DC supply of 1.5/1.8 V and consumes less than 1.8 µA of current. This crystal oscillator is available in a surface-mount package that measures 2.5 x 2.0 x 0.8 mm and is ideal for RTC reference clocks, wearable devices, health and wellness monitors, ultra-small notebook PCs, sports video cameras, and mobile phone applications.