特長
- Designed for use in SAS, SAS-2 systems
- Up, down and center Spread Spectrum Clocking (SSC)
- One differential 3.3V or 2.5V LVPECL output pair
- Output frequency: 75MHz
- RMS phase jitter @ 75MHz, (900kHz – 7.5MHz): 0.734ps (typical) @ 3.3V
- 3.3V or 2.5V operating supply modes
- 0°C to 70°C ambient operating temperature
- Available in lead-free (RoHS 6) package
説明
The 843751 is a low jitter, high performance clock generator. The 843751 is designed for use in the SAS-2 interconnect and the three transport protocols that use the SAS-2 interconnect: Serial SCSI Protocol (SSP), Serial ATA Tunneled Protocol (STP), and Serial Management Protocol (SMP). The 843751 has excellent (<1ps) RMS phase jitter, over the SAS defined integration range. The 843751 uses an external, 25MHz, parallel resonant crystal to generate 75MHz. This silicon based approach provides excellent frequency stability and reliability. The 843751 features up, down, and center spread spectrum (SSC) clocking techniques. The up, down and center SSC will be required in the SAS-2 applications that have three clock trees in the HBA and expander ASICs.