GENERAL DESCRIPTION

The ICS8442BI is a general purpose, dual output Crystalto-Differential LVDS High Frequency Synthesizer.

The ICS8442BI 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

parallelinterface to the configuration logic. The low phase

noisecharacteristics of the ICS8442BI 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: 3.5ps (typical)

• Cycle-to-cycle jitter: 18ps (typical)

• 3.3V supply voltage

• -40°C to 85°C ambient operating temperature