General Description

The 843252-45 is a 2 LVPECL output Synthesizer optimized to

generate Ethernet reference clock frequencies. Using a 25MHz,

18pF parallel resonant crystal, the following frequencies can be

generated: 156.25MHz and 125MHz. The 843252-45 uses IDT’s 3rd

generation low phase noise VCO technology and can achieve 1ps

or lower typical rms phase jitter, easily meeting Ethernet jitter

requirements. The 843252-45 is packaged in a small 16-pin TSSOP

package.

Features

• Two differential LVPECL output pairs

• Crystal oscillator interface designed for a 25MHz, 18pF parallel

resonant crystal

• A 25MHz crystal generates output frequencies of: 156.25MHz

and 125MHz

• VCO frequency: 625MHz

• RMS Phase Jitter @ 156.25MHz, (1.875MHz – 20MHz) using a

25MHz crystal: 0.54ps (typical)

• Full 3.3V supply mode

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package

• For functional replacement part us 8T49N241