概览
描述
The 843442I is a low jitter, high performance clock generator and a member of the FemtoClock™ family of silicon timing products. The 843442I is designed for use in applications using the SAS and SATA interconnect. The 843442I 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 843442I features down and center spread spectrum (SSC) clocking techniques.
特性
- 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
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