ZHCSJ49F March 2017 – February 2019 TDA2P-ACD
请参考 PDF 数据表获取器件具体的封装图。
The SATA data signal traces must be routed to achieve 100 Ω (+/-10 %) differential impedance and 60 Ω (+/-10 %) single ended impedance. The signal ended impedance is required because differential signals can’t be closely coupled on PCBs and therefore single ended impedance becomes important. 60 Ω is chosen for the single ended impedance to minimize problems caused by too low an impedance.
These impedances are impacted by trace width, trace spacing, distance to reference planes, and dielectric material. Verify with a PCB design tool that the trace geometry for both data signal pairs results in as close to 100 Ω differential and 60 Ω single ended impedance traces as possible. For best accuracy, work with your PCB fabricator to ensure this impedance is met.
Table 7-20 shows the routing specifications for the SATA data signals.
|SATA signal trace length (device balls to SATA connector)||3050(1)||Mils|
|Differential pair trace skew matching||5||Mils|
|Number of stubs allowed on SATA traces(2)||0||stubs|
|TX/RX pair differential impedance||90||100||110||Ω|
|TX/RX single-ended impedance||54||60||66||Ω|
|Number of vias on each SATA trace||0||Vias|
|SATA differential pair to any other trace spacing||2×DS(3)|
|ESD part number||None||ESD suppression generally not used on SATA|