GENERAL DESCRIPTION
The ICS84321I is a general purpose, dual output Crystal-to-3.3V Differential LVPECL High Frequency Synthesizer and a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The ICS84321I has a select able TEST_CLK or crystal inputs. The VCO operates at a frequency range of 620MHz to 780MHz. 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 using the serial or parallel interfaces to the configuration logic. The low phase noise characteristics of the ICS84321I make it an ideal clock source for Fibre Channel 1, Fibre Channel 2, 10 Gigabit Fibre Channel, Gigabit Ethernet and 10 Gigabit Ethernet applications.

FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface or LVCMOS/LVTTL TEST_CLK
• Output frequency range: 103.3MHz to 260MHz
• Crystal input frequency range: 14MHz to 40MHz
• VCO range: 620MHz to 780MHz
• Parallel or serial interface for programming counter and output dividers
• RMS period jitter: 3ps (typical)
• RMS phase jitter at 155.52MHz, using a 38.88MHz crystal (12KHz to 20MHz): 2.5ps (typical)
    Phase noise: 155.52MHz
    Offset Noise Power
    100Hz ..................-84.1 dBc/Hz
    1KHz ................ -109.8 dBc/Hz
    10KHz ................ -126.3 dBc/Hz
    100KHz ................ -128.7 dBc/Hz
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature