General Description

The ICS843004I-156 is a four output LVPECL synthesizer optimized

to generate Ethernet reference clock frequencies. Using a 25MHz

18pF parallel resonant crystal, the ICS843004I-156 can generate

156.25MHz.

The ICS843004I-156 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

ICS843004I-156 is packaged in a small 24-pin TSSOP E-Pad

package.

Features

• Four 3.3V differential LVPECL output pairs

• Selectable crystal oscillator interface

or LVCMOS/LVTTL single-ended clock input

• 156.25MHz output frequency

• VCO range: 560MHz – 680MHz

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

(1.875MHz – 20MHz): 0.49ps (typical)

• Full 3.3V or 2.5V supply modes

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

• Available in lead-free (RoHS 6) package