22.214.171.124. Simultaneous Switching Noise
|1||Break out large bus signals on board layers close to the device to reduce cross talk.|
|2||Route traces orthogonally if two signal layers are next to each other, if possible. Use a separation of two to three times the trace width.|
SSN is a concern when too many pins (in close proximity) change voltage levels at the same time. Noise generated by SSN can reduce the noise margin and cause incorrect switching. Although SSN is dominant on the device package, plan the board layout according to the board layout recommendations in the PCB guidelines can help with noise reduction.