FemtoClock SAS/SATA Clock Generator

The 843442 is a low jitter, high performance clock generator. The 843442 is designed for use in applications using the SAS and SATA interconnect. The 843442 uses an external, 25MHz, parallel resonant crystal to generate two selectable output frequencies: 75MHz and 150MHz. This silicon based approach provides excellent frequency stability and reliability. The 843442 features down and center spread spectrum (SSC) clocking techniques.

• Designed for use in SAS, SAS-2, and SATA systems
• Center (±0.25%) Spread Spectrum Clocking (SSC)
• Down (-0.23% or -0.5%) SSC
• Two differential 3.3V LVPECL output pairs
• Crystal oscillator interface designed for 25MHz (CL = 18pF) frequency
• External fundamental crystal frequency ensures high reliability and low aging
• Selectable output frequencies: 75MHz, 150MHz
• Output frequency is tunable with external capacitors
• RMS phase jitter at 150MHz (integrated from 12kHz to 20MHz): 1.07ps (typical)
• 3.3V operating supply
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package