GENERAL DESCRIPTION
The ICS8442B is a general purpose, dual output Crystal-toDifferential LVDS High Frequency Synthesizer . The ICS8442B
has a selectable TEST_CLK or crystal input. The TEST_CLK
input accepts LVCMOS or LVTTL input levels and translates
them to LVDS levels. 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 ICS8442B makes
it an ideal clock source for Gigabit Ethernet and Sonet applications.

FEATURES
• Dual differential LVDS outputs
• Selectable crystal oscillator interface or
LVCMOS/LVTTL TEST_CLK
• Output frequency range: 31.25MHz to 700MHz
• Crystal input frequency range: 10MHz to 25MHz
• VCO range: 250MHz to 700MHz
• Parallel or serial interface for programming counter
and output dividers
• RMS period jitter: 2.7ps (typical)
• Cycle-to-cycle jitter: 18ps (typical)
• 3.3V supply voltage
• 0°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant