AOZ8235
Rev. 2.0 November 2014 www.aosmd.com Page 4 of 6
Applications Information
Device Connection for Protection of Five
Unidirectional Data Lines
These devices are designed to protect up to five
unidirectional data lines. The device is connected as
follows.
1. Unidirectional protection of five I/O lines is achieved
by connecting pins 1, 3, 4, 5 and 6 to the data lines.
Connect pin 2 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 in the
board traces.
Device Connection for Protection of Four
Bidirectional Data Lines
These devices are designed to protect up to four
bidirectional data lines. The device is connected as
follows.
1. Bidirectional protection of four I/O lines is achieved
by connecting pins 1, 3, 4, and 6 to the data lines.
Connect pin 5 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 in the
board traces.
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:
Place the TVS near the input terminals or connectors
to restrict transient coupling.
Minimize the path length between the TVS and the
protected line.
Minimize all conductive loops including power and
ground loops.
The ESD transient return path to ground should be
kept as short as possible.
Never run critical signals near board edges.
Use ground planes whenever possible.
2
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Protection of Five Unidirectional Lines
Circuit Diagram
I/O1
I/O2
I/O3
I/O4
I/O5
4
5
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Protection of Four Bidirectional Lines
Circuit Diagram
I/O1
I/O2
I/O3
I/O4
