Standard frequency crystals – use these crystals to provide a clock input to your microprocessor. Rated at 20pF capacitance and +/- 50ppm stability.
The 16 MHz Crystal Oscillator module is designed to handle off-chip crystals that have a frequency of 4-16 MHz. The crystal oscillatorís output is fed to the System PLL as the input reference. The oscillator design generates low frequency and phase jitter, which is recommended for USB operation.