The multiple ground pins provided lower the connection resistance to ground. In order to improve circuit operation, a connection to all ground pins must be provided on the system printed circuit board. Without proper device connection to ground, the speed and protection capability of the device will be degraded.

• The ground termination pads should be connected directly to a ground plane on the board for optimum performance. A single trace ground conductor will not provide an effective path for fast rise-time transient events including ESD due to parasitic inductance.
• Nominal inductive values of a PCB trace are approximately 20 nH/cm. This value may seem small, but an apparent short length of trace may be sufficient to produce significant L(di/dt) effects with fast rise-time ESD spikes.
• Mount the TVS as close as possible to the I/O socket to reduce radiation originating from the transient as it is routed to ground.