GENERAL DESCRIPTION
The ICS8432-51 is a general purpose, dual output Crystal-to3.3V Differential LVPECL High Frequency Synthesizer. The
ICS8432-51 has a selectable REF_CLK or crystal input. The
VCO operates at a frequency range of 250MHz to 700MHz. 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 interface to the configuration logic. The low phase noise characteristics of the ICS8432-51 make it an ideal clock source for Gigabit Ethernet, Fibre Channel 1 and 2, and Infiniband applications.

FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface or
LVCMOS/LVTTL REF_CLK
• Output frequency range: 31.25MHz to 700MHz
• Crystal input frequency range: 12MHz to 25MHz
• VCO range: 250MHz to 700MHz
• Parallel or serial interface for programming counter and
output dividers
• RMS period jitter: 3.5ps (maximum)
• Cycle-to-cycle jitter: 25ps (maximum)
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
• Replaces the ICS8432-01