General Description

The 843004I is a 4 output LVPECL synthesizer optimized to generate

Fibre Channel reference clock frequencies. Using a 26.5625MHz

18pF parallel resonant crystal, the following frequencies can be

generated based on the two frequency select pins (F_SEL[1:0]):

212.5MHz, 187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and

53.125MHz. The 843004I uses IDT’s 3rd generation low phase noise

VCO technology and can achieve 1ps or lower typical rms phase

jitter, easily meeting Fibre Channel jitter requirements. The 843004I

is packaged in a small 24-pin TSSOP package.

Features

• Four 3.3V differential LVPECL output pairs

• Selectable crystal oscillator interface or LVCMOS/LVTTL

single-ended clock input

• Supports the following output frequencies: 212.5MHz, 187.5MHz,

159.375MHz, 156.25MHz, 106.25MHz, 53.125MHz

• VCO range: 560MHz – 680MHz

• Output skew: 50ps (maximum)

• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal

(2.55MHz – 20MHz): 0.47ps (typical)

• Full 3.3V or 2.5V supply modes

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

• Available in lead-free (RoHS 6) package