Place the protection and filtering circuitry as close to the bus connector to prevent transients, ESD and noise from propagating onto the board. The layout example provides information on components around the device itself. Transient voltage suppression (TVS) device can be added for extra protection. The production solution can be either bi-directional TVS diode or varistor with ratings matching the application requirements. This example also shows optional bus filter capacitors.

Design the bus protection components in the direction of the signal path. Do not force the transient current to divert from the signal path to reach the protection device. Use supply and ground planes to provide low inductance.

Use at least two vias for supply and ground connections of bypass capacitors and protection devices to minimize trace and via inductance.

• Bypass and bulk capacitors should be placed as close as possible to the supply terminals of transceiver.
• Bus termination: this layout example shows split termination. This is where the termination is split into two resistors with the center or split tap of the termination connected to ground via capacitor. Split termination provides common mode filtering for the bus. When bus termination is placed on the board instead of directly on the bus, additional care must be taken to ensure the terminating node is not removed from the bus thus also removing the termination.