GENERAL DESCRIPTION

The 843202I is a 2 output LVPECL Synthesizer optimized to generate

Gigabit Ethernet and SONET reference clock frequencies and is

a member of the family of high performance clock solutions from

IDT. Using a 19.44MHz and 25MHz, 18pF parallel resonant crystal,

155.52MHz and 156.25MHz frequencies can be generated. The part

also allows the use of a recovered clock at QB output. The 843202I

uses IDT’s FemtoClockTM low phase noise VCO technology and can

achieve 1ps or lower typical RMS phase jitter. The 843202I is

packaged in a 32-pin LQFP package.

FEATURES

? Two 3.3V LVPECL outputs

? Selectable crystal oscillator interface or one differential recovered clock inputs

? Supports the following output frequencies: 155.52MHz and

156.25MHz

? VCO range: 560MHz - 680MHz

? RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal

(12kHz – 1.3MHz): 0.86ps (typical)

? RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(1.875MHz –- 20MHz): 0.56ps (typical)

? Full 3.3V supply mode

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

? Available in lead-free (RoHS 6) package

? For functional replacement part use 8T49N242