SLLS573E December 2003 – March 2024 SN65MLVD200A , SN65MLVD202A , SN65MLVD204A , SN65MLVD205A
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
Following the choice of dielectrics and design specifications, the designer must decide how many levels to use in the stack. To reduce the TTL/CMOS to M-LVDS crosstalk, it is a good practice to have at least two separate signal planes as shown in Figure 11-3.
The separation between layers 2 and 3 must be 127 μm (0.005 in). By keeping the power and ground planes tightly coupled, the increased capacitance acts as a bypass for transients.
One of the most common stack configurations is the six-layer board, as shown in Figure 11-4.
In this particular configuration, it is possible to isolate each signal layer from the power plane by at least one ground plane. The result is improved signal integrity; however, fabrication is more expensive. Using the 6-layer board is preferable because it offers the layout designer more flexibility in varying the distance between signal layers and referenced planes, in addition to ensuring reference to a ground plane for signal layers 1 and 6.