Description The NB3N3001 is a low−jitter, dual−rate PLL−synthesized clock generator. It accepts a standard 26.5625 MHz fundamental mode AT cut parallel resonant crystal as the reference source for its integrated crystal oscillator and low noise phase−locked loop (PLL) and produces user selectable clock frequencies of either 106.25 MHz or 212.5 MHz. In addition, the PLL circuitry will generate a 50% duty cycle square−wave through a pair of differential LVPECL clock outputs. Typical phase jitter at 106.25 MHz is 0.3 ps RMS from 637 kHz to 10 MHz. The LVPECL output drivers can be disabled to high impedance with the OE pin set LOW. The NB3N3001 operates from a single +3.3 V supply, and is available in both plastic package and die form. The operating temperature range is from −40°C to +85°C. The NB3N3001 device provides the optimum combination of low cost, flexibility, and high performance which makes it ideal for Fibre−Channel applications.