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TClamp3302N
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Two
High-Speed Data Lines
These devices are designed to protect two high-speed
data lines (one differential pair) from transient over-
voltages which result from lightning and ESD. They can
be configured to protect in differential (Line-to-Line)
and common (Line-to-Ground) mode. Data line inputs/
outputs are connected at pins 1, 2 and 3, and 8, 9
and 10 as shown. For proper operation, pins 1 - 3
must be connected together and pins 8 - 10 must be
connected together. Pins 4, 5, 6, and 7 may be left
unconnected. For differential operation, the center tab is
also left not connected. For common mode operation,
the center tab is connected to ground. The ground
connection should be made directly to a ground plane
on the board for best results. The use of multiple vias
is recommended for reduced ground loop inductance.
Short-Haul/Intrabuilding Immunity Requirements for
Ethernet-based Systems
Circuit Diagram
LINE 1
(1, 2, 3)
Center Tab
LINE 2
(8, 9, 10)
Pin Configuration (Top Side View)
The accelerating demand for bandwidth-hungry
services such as Voice over IP, Metropolitan Area
Networks (MAN), Ethernet over telecommunications
backplanes, and broadband to the home are driving
the deployment of high-reliability carrier and enterprise
class Ethernet-based systems. These systems require
1
2
3
4
5
GND
10
9
8
7
6
the robust protection of external ports from transient
voltage events such as lightning, electrostatic
discharge, and cable discharge events. Each new
generation of Ethernet deployment yields higher-
density boards that demand protection solutions that
occupy less board space.
The Telcordia Technologies (Bellcore) GR-1089-CORE
specification defines a set of requirements for lightning
and AC power cross immunity for intrabuilding equip-
ment. The lightning tests are applied as metallic (line-
to-line) or longitudinal (line-to-ground) waveforms. The
waveforms are defined with a rise time of 2μs and a
decay time of 10μs with a short circuit current of
100A. One surge of positive and one of negative
polarity are applied. To pass the test, the equipment
must continue to operate after the test. If a 2/10μs
generator is unavailable, then a 8/20μs waveform may
be applied with additional series resistance (6 ? metal-
lic, 12 ? longitudinal).
? 2008 Semtech Corp.
5
P i n
1 , 2 , 3
8 , 9 , 1 0
4 , 5 , 6 , 7
C e n t e r T a b
I d e n t i f i c a t i o n
L i n e 1 i n / o u t
L i n e 2 i n / o u t
N o C o n n e c t
G r o u n d
www.semtech.com
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