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RClamp7002M
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Two
High-Speed Data Lines
This device is designed to protect two data lines from
transient over-voltages by clamping them to a fixed
reference. When the voltage on the protected line
Schematic
Pin 7, 8, 9
exceeds the reference voltage (plus diode V F ) the
steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Pin 1
Pin 10
Pin 5
Pin 6
Data line inputs are connected at pins 1 and 5. The
outputs are connected at pins 10 and 6 respectively.
The negative reference is connected at pins 2, 3, and
4. These pins should be connected directly to a ground
plane on the board for best results. The path length is
kept as short as possible to minimize parasitic
inductance. The positive reference is connected at
pins 7, 8, and 9. The options for connecting the
positive reference are as follows:
Pin 2, 3,4
Pin Configuration
1. To protect data lines and the power line, connect
pins 7, 8 and 9 directly to the positive supply rail
(V CC ). In this configuration the data lines are
referenced to the supply voltage. An external TVS
diode may be added between the supply rail and
ground in order to prevent over-voltage on the
supply rail.
2. In applications where no positive supply reference
Line 1
In
GND
GND
GND
Line 2
In
1
Line 1
Out
Vcc
Vcc
Vcc
Line 2
Out
is available, or complete supply isolation is desired,
an external TVS diode may be used as the refer-
ence. The steering diodes will begin to conduct
when the voltage on the protected line exceeds the
working voltage of the TVS (plus one diode drop).
? 2010 Semtech Corp.
4
www.semtech.com
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