SMDA05TB 데이터 시트보기 (PDF) - Semtech Corporation
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SMDA05TB Datasheet PDF : 7 Pages
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PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Four Data Lines
The SMDAxx series devices are designed to protect up to
four data lines. The devices are connected as follows:
l The SMDAxx are unidirectional devices and are
designed for use on lines where the normal operat-
ing voltage is above ground. Pins 1, 2, 3, and 4 are
connected to the protected lines. Pins 5, 6, 7, and 8
are connected to ground. 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 inductance 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 connectors
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.
ã 2000 Semtech Corp.
5
SMDA05 THRU SMDA24
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
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