SMF05TG 데이터 시트보기 (PDF) - Semtech Corporation
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SMF05TG Datasheet PDF : 7 Pages
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PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Four Data Lines
The SMFxx is designed to protect up to four unidirec-
tional data lines. The device is connected as follows:
1. Unidirectional protection of four I/O lines is
achieved by connecting pins 1, 3, 4, and 5 to the
data lines. Pin 2 is connected 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 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 SMFxx near the input terminals or con-
nectors to restrict transient coupling.
l Minimize the path length between the SMSxx 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.
SMF05 & SMF12
SMF Circuit Diagram
1
3
4
5
2
Protection of Four Unidirectional Lines
ã 2000 Semtech Corp.
4
www.semtech.com
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