The TI DS320PR822NJXT is an eight-channel PCIe 5.0 ReDriver that handles differential input and output at a maximum data rate of 32 Gbps. It's the part you find on a dead server backplane when the link training fails on Gen 5 lanes — the input equalisation stage is the first thing to check with a scope. The 4 x 2:2 crosspoint means four upstream lanes can be fanned out to two downstream ports each, common in PCIe bifurcation or M.2 slot redrives.
1.6 pF input capacitance — why it matters at 32 Gbps
Input capacitance sits at 1.6 pF, low enough that it doesn't collapse the upstream transmitter's eye opening at 32 Gbps. If you're swapping in a redriver from a different family and the eye margin drops, this capacitance figure is the first suspect — a 2 pF part will close the mask on a marginal layout. The 0.1 ns propagation delay keeps the lane-to-lane skew tight enough for PCIe Gen 5 timing budgets.
Package and supply rail — layout checklist
Housed in a 64-WFQFN exposed-pad package (5.5 x 10 mm body), surface-mount only. Supply range is 3 V to 3.6 V — a clean 3.3 V rail with adequate decoupling at the exposed pad is the rule.