General Description

The 843004 is a 4 output LVPECL synthesizer optimized to

generate Fibre Channel reference clock frequencies and is a

member of the HiPerClocksTM family of high performance clock

solutions from IDT. Using a 26.5625MHz 18pF parallel resonant

crystal, the following frequencies can be generated based on the 2

frequency select pins (F_SEL[1:0]): 212.5MHz, 187.5MHz,

159.375MHz, 156.25, 106.25MHz, and 53.125MHz. The 843004

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 843004 is packaged in a

small 24-pin TSSOP package.

Features

• Four 3.3Vdifferential 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

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

(637kHz – 10MHz): 0.72ps (typical)

Offset Noise Power

100Hz ................ -95.0 dBc/Hz

1kHz .................. -114.3 dBc/Hz

10kHz ................ -123.8 dBc/Hz

100kHz .............. -124.6 dBc/Hz

• Full 3.3V supply mode

• -30°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package