2006/03/28

Ver.4

Page 5 4

SPE0504

4-Line ESD Protection Array

APPLICATION NOTE

Device Connection for Protection of Four Data Lines

SPE0504 is designed to protect up to four data lines. The device is connected as follows:

1. The TVS protection of four I/O lines is achieved by connecting pins 1, 3, 4 and 6 to the data lines. Pin 2 and 5

are connected to ground. The ground connection should be made directly to the ground plane for best results.

The path length is kept as short as possible to reduce the effects of parasitic inductance.

Circuit Board Layout Recommendations for Suppression of ESD

Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are

recommended:

1. Place the TVS near the input terminals or connectors to restrict transient coupling.

2. Minimize the path length between the TVS and the protected line.

3. Minimize all conductive loops including power and ground loops.

4. The ESD transient return path to ground should be kept as short as possible.

5. Never run critical signals near board edges.

6. Use ground planes whenever possible.