PCIe Gen 4 linear equalizer — what it does and where it fits
The NXP PTN3944EWY is a 4-channel linear equalizer designed for PCIe Gen 4 links, handling data rates up to 16 Gbps per lane. It accepts differential input and delivers a differential output, applying input equalization to compensate for channel loss in high-speed serial interconnects. Typical deployment is on server motherboards, add-in cards, and backplane routing where trace lengths or connector losses exceed the PCIe eye budget.
16 Gbps per lane — what it means for the link
The 16 Gbps data rate matches the PCIe Gen 4 lane rate exactly. At this speed, the 70 ps delay is a few unit intervals of latency — negligible for the link budget. The 250 mA supply draw at 1.7 V to 1.9 V is typical for a four-lane equalizer.