GENERAL DESCRIPTION
The 840051 is a Gigabit Ethernet Clock Generator and a
member of the family of high performance devices from IDT.
The 840051 can synthesize 10 Gigabit Ethernet,
SONET, or Serial ATA reference clock frequencies
with the appropriate choice of crystal and
output divider. The 840051 has excellent phase jitter
performance and is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space

FEATURES
• 1 LVCMOS/LVTTL output, 15Ω output impedance
• Crystal oscillator interface designed for
18pF parallel resonant crystals
• Output frequency range: 70MHz - 170MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter at 155.52MHz (1.875MHz - 20MHz):
0.48ps (typical)
• RMS phase noise at 155.52MHz
Offset Noise Power
100Hz ................-99.7 dBc/Hz
1KHz .................-120 dBc/Hz
10KHz .................-128 dBc/Hz
100KHz .................-127 dBc/Hz
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Lead-Free fully RoHS compliant
• Industrial temperature information available upon request
• Not Recommended For New Designs
• For New Designs use ICS840N051BGI