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05116.R8 8/10

Page 6

PSR05

APPlicATion inFoRMATion

FiguRe 1 - uSB PRoTecTion

Two PSR05s (Unidirectional) in a Common-Mode configuration. Circuit connectivity is as follows:

• Pins 2 and 3 are connected to the datalines

• Pin 1 is connected to ground

• Pin 4 is connected to the databus

ciRcuiT BoARd RecoMMendATionS

Circuit board layout is critical for electromagnetic compatibility protection. The following 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 minimized.

• 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.

3

4

1

2

3

4

1

2

VBus

VBus

D+

D+

D-

D-

VBus

VBus

USB

PORT

USB

PORT