SMDA05C(2000) データシートの表示（PDF） - Semtech Corporation
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SMDA05C Datasheet PDF : 7 Pages
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PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Four Data Lines
The SMDAxxC series devices are designed to protect
up to four data lines. The devices are connected as
follows:
l The SMDAxxC are bidirectional devices and are
designed for use on lines where the normal operat-
ing voltage is above and below ground. Pins 1, 2,
3, and 4 are connected to the protected lines.
Pins 5, 6, 7, and 8 are connected to ground. Since
the device is electrically symmetrical, these connec-
tions may be reversed. The ground connections
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 induc-
tance in the board traces.
Circuit Board Layout Recommendations for Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
l Place the TVS near the input terminals or connec-
tors to restrict transient coupling.
l Minimize the path length between the TVS and the
protected line.
l Minimize all conductive loops including power and
ground loops.
l The ESD transient return path to ground should be
kept as short as possible.
l Never run critical signals near board edges.
l Use ground planes whenever possible.
SMDA05C THRU SMDA24C
Circuit Diagram
1
8
2
7
3
6
4
5
I/O Line Protection
Typical Connection
To Protected
Device
1
8
2
7
Ground
3
6
4
5
From Connector
ã 2000 Semtech Corp.
5
www.semtech.com
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