843751中文资料FemtoClock SAS/SATA Clock Generator数据手册Renesas规格书

描述 Description

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.

特性 Features

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