GENERAL DESCRIPTION

The 843246I is a Crystal-to-3.3V LVPECL Clock Synthesizer/Fanout

Buffer designed for Fibre Channel and Gigabit Ethernet applications

and is a member of the family of High Performance Clock Solutions

from IDT. The output frequency can be set using the frequency select

pins and a 25MHz crystal for Ethernet frequencies, or a 26.5625MHz

crystal for a Fibre Channel. The low phase noise characteristics of

the 843246I make it an ideal clock for these demanding applications.

FEATURES

• Six LVPECL outputs

• Crystal oscillator interface

• VCO range: 490MHz to 680MHz

• Crystal input frequency range: 25MHz to 33.333MHz

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

(1.875MHz to 20MHz): 0.41ps (typical)

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

Core/Output

3.3V/3.3V

3.3V/2.5V

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

• Available in lead-free (RoHS 6) package