General Description
The SY58021U is a 2.5V/3.3V precision, high-speed, fully differential 1:4 LVPECL fanout buffer. Optimized to provide four identical output copies with less than 15ps output skew and only 70 fsRMS phase jitter, the SY58021U can process clock signals as fast as 4GHz.

FEATUREs
• Precision 1:4 LVPECL fanout buffer
• Guaranteed AC performance-over-temperature/voltage:
    − >4GHz fMAX (clock)
    − <100ps tr/tf times
    − <300ps tPD
    − <15ps maximum skew
• Low jitter performance:
    − 70fsRMS phase jitter (typical)
• Accepts an input signal as low as 100mV
• Unique input termination and VT pin accepts DCcoupled and AC-coupled differential inputs: LVPECL, LVDS, and CML
• 100k LVPECL-compatible 800mV swing output
• Power supply 2.5V ±5% and 3.3V ±10%
• −40°C to +85°C temperature range
• Available in 16-pin (3mm × 3mm) QFN package

APPLICATIONs
• All SONET and GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
• High-end, low-skew, multiprocessor, synchronous clock distribution