General Description

The 843001I-22 is a a highly versatile, low phase noise

LVPECL/LVCMOS Synthesizer which can generate low jitter

reference clocks for a variety of communications applications and is

a member of the family of high performance clock solutions from IDT.

The dual crystal interface allows the synthesizer to support up to two

communication standards in a given application (i.e. 1GB Ethernet

with a 25MHz crystal and 1Gb Fibre Channel using a 26.5625MHz

crystal). The rms phase jitter performance is typically less than 1ps,

thus making the device acceptable for use in demanding

applications such as OC48 SONET and 10Gb Ethernet. The

843001I-22 is packaged in a small 24-pin TSSOP package.

Features

• One 3.3Vdifferential LVPECL output pair and

one LVCMOS/LVTTL single-ended reference clock output

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended input

• VCO range: 490MHz – 640MHz

• Output frequency range: 49MHz – 640MHz

• Supports the following applications:

SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV

• RMS phase jitter @ 125MHz (1.875MHz - 20MHz):

0.50ps (typical)

• Full 3.3V or 2.5V supply mode

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

• Available in lead-free (RoHS 6) package