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