RTL8366/8369 & RTL8212
Layout Guide
RTL8366/8369 & RTL8212 Layout Guide
7
Track ID: JATR-1076-21 Rev. 1.1
TX Pair
25M CLK
RX Pair
5 mils
5 mils
7 mils
5 mils
5 mils
7 mils
>=30 mils
>=30 mils
Figure 2. Trace Width and Spacing Recommendation for Microstrip
•
Differential pairs should maintain symmetry between the two signals of a differential pair
whenever possible.
Preferred: Symmetrical Routing
Avoid: Non-symmetrical Routing
Figure 3. Symmetrical Routing
•
Keep differential pair routing lengths as short as possible.
•
Match the length of both sets of the differential pairs, allowing no more than a 5-mil delta
between the lengths of the two signals.
•
Length matching should occur on a segment-by-segment basis vs. across the total distance of the
overall route.
•
Differential pairs should have a continuous reference plane, and avoid vias.
•
Size 0402 AC coupling capacitors are strongly encouraged as the smaller the package size, the
less ESL.
•
Place AC coupling capacitors near output pins of differential pairs.
•
Locate capacitors for coupled traces at the same location along the differential traces and near
output pins of differential pairs.
