The PI6C484321 is a dual output, 3.3V LVPECL Frequency Synthesizer using crystal as the input source. The input source is can be selected from either LVTTL/LVCMOS level input (TEST_CLK pin) or crystal inputs. The VCO operates at a frequency range of 320MHz to 1.1GHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed through a simple 2-wire serial interface or through 11-bit parallel interface. The low phase noise characteristics of the PI6C484321 make it an ideal clock source for Fibre Channel 1 (FC1), Fibre Channel 2 (FC2), 10 Gigabit Fibre Channel (10GFC), Gigabit Ethernet and 10 Gigabit Ethernet (10GbE) applications.