SLVU28-4 Datasheet, PDF (4/8 Pages) Protek Devices – ULTRA LOW CAPACITANCE TVS ARRAY

SLVU2.8-4
PROTECTION PRODUCTS
Applications Information
Device Connection for Protection of Four Data Lines
Electronic equipment is susceptible to transient distur-
bances from a variety of sources including: ESD to an
open connector or interface, direct or nearby lightning
strikes to cables and wires, and charged cables “hot
plugged” into I/O ports. The SLVU2.8-4 is designed to
protect sensitive components from damage and latch-
up which may result from such transient events. The
SLVU2.8-4 can be configured to protect two high-
speed line pairs. The device is connected as follows:
SLVU2.8-4 Circuit Diagram
1 . Protection of two high-speed line pairs:
The SLVU2.8-4 is designed such that the data lines
are routed through the device. The first line pair
enters at pins 1 and 2 and exit at pins 8 and 7
respectively. The second line pair enters at pins 3
and 4 and exits at pins 6 and 5. The traces must
be connected at the bottom of the device as
shown.
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 SLVU2.8-4 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.
Low Capacitance Protection of Two Differential Line
Pairs
Line 1
1
Line 2
2
Line 3
3
Line 4
4
8
Line 1
7
Line 2
6
Line 3
5
Line 4
ã 2000 Semtech Corp.
4
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