This part apparently supports ESD protection of eSATA. But SATA interfaces are AC coupled. This means their common mode voltages could well be centered around 0V, with negative voltage swing. On the diagram for this ESD part, I can see that there will be a problem with it clipping any negative voltage swing below -0.7V.
Am I understanding this right? How can this part possibly support eSATA? The other interfaces such as USB3.0 and DisplayPort are also AC-coupled. Am I missing something?