Circuit Protection of VGA Port

Design Notes:
Protection Application:
The signal lines used in a VGA port have a maximum frequency of 25 MHz, and are 0.7 Vp-p for R, G, and B lines, and 0.3 to 5.0 Vp-p for ID01, ID02, ID03, H-sync and V-sync. For these lines, the capacitance of the suppress needs to be taken into account.
Solution Description:
As shown at the left, discrete multilayer varistors can be used for board layout flexibility, or to reduce part count, two rail clamp devices can be used.
Companion Solutions:
Does not apply.
Regulatory Issues:
The IEC 61000-4-2 will be the most appropriate standard that applies for this port. It supplies a test method for verifying that the end product is not susceptible to ESD events.
Unique Features:Does not apply.
Application Warnings:Does not apply.

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