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05109.R8 10/10

Page 6

PLC496

APPLiCATion inFoRMATion

FiGuRe 1 - DiFFeRenTiAL MoDe i/o PoRT PRoTeCTion

Circuit connectivity is as follows:

• Pins 1, 4, 5 and 8 are connected to the data lines.

• Pins 2, 3, 6 and 7 are not connected.

1

2

4

8

3

5

6

7

LINE 1 IN

LINE 2 IN

LINE 1 OUT

LINE 2 OUT

FiGuRe 2 - CoMMon MoDe sensoR PRoTeCTion

Circuit connectivity is as follows:

• Pins 1 and 8 connected to the dataline.

• Pins 4 and 5 connected to ground.

• Pins 2, 3, 6 and 7 are not connected.

1

2

4

8

3

5

6

7

1

2

4

8

3

5

6

7

NC

NC

NC

NC

NC

NC

NC

NC

CiRCuiT BoARD ReCoMMenDATions

Circuit board layout is critical for electromagnetic compatibility protection. The follow-

ing guidelines are recommended:

• The protection device should be placed near the input terminals or connectors, the

device will divert the transient current immediately before it can be coupled into

the nearby traces.

• The path length between the TVS device and the protected line should be mini-

mized.

• All conductive loops including power and ground loops should be minimized.

• The transient current return path to ground should be kept as short as possible to

reduce parasitic inductance.

• Ground planes should be used whenever possible. For multilayer PCBs, use ground

vias.