General Description

The ICS844256D is a Crystal-to-LVDS Clock Synthesizer/Fanout

Buffer designed for SONET and Gigabit Ethernet applications. The

output frequency can be set using the frequency select pins and a

25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for

SONET. The low phase noise characteristics of the ICS844256D

make it an ideal clock for these demanding applications.

Features

• Six differential LVDS output pairs

• Crystal oscillator interface

• Output frequency range: 62.5MHz - 625MHz

• Crystal input frequency range:15.625MHz - 25.5MHz

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz – 20MHz): 0.43ps (typical)

• Full 3.3V or mixed 3.3V core, 2.5V output supply mode

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package