SPRS989F December 2016 – December 2018 DRA74P , DRA75P
PRODUCTION DATA.
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The PCIe data signal traces must be routed to achieve 100-Ω (±10%) differential impedance and 60-Ω (±10%) single-ended impedance. The single-ended impedance is required because differential signals are extremely difficult to closely couple on PCBs and, therefore, single-ended impedance becomes important. These requirements are the same as those recommended in the PCIe Motherboard Checklist 1.0 document, available from PCI-SIG (www.pcisig.com).
These impedances are impacted by trace width, trace spacing, distance between signals and referencing planes, and dielectric material. Verify with a PCB design tool that the trace geometry for both data signal pairs result in as close to 100-Ω differential impedance and 60-Ω single-ended impedance as possible. For best accuracy, work with your PCB fabricator to ensure this impedance is met. See Table 7-24 below.