GENERAL DESCRIPTION

The 840002I is a 2 output LVCMOS/LVTTL 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

2 frequency select pins (F_SEL1:0): 212.5MHz, 159.375MHz,

156.25MHz, 106.25MHz, and 53.125MHz. The 840002I 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 840002I is packaged in

a 16-pin TSSOP package.

FEATURES

• Two LVCMOS outputs @ 3.3V, 17Ω typical output impedance

• Selectable crystal oscillator interface

or LVCMOS single-ended input

• Output frequency range: 46.66MHz - 233.33MHz

• VCO range: 560MHz - 700MHz

• Supports the following output frequencies: 212.5MHz,

159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz

• RMS phase jitter @ 212.5MHz (637KHz - 10MHz):

0.83ps (typical)

Typical phase noise at 212.5MHz:

Offset Noise Power

100Hz ................-91.3 dBc/Hz

1KHz ..............-114.3 dBc/Hz

10KHz ..............-120.7 dBc/Hz

100KHz ..............-120.2 dBc/Hz

• Power supply modes:

Core/Output

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

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

• Lead-Free package RoHS compliant