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SR70
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Two
High-Speed Data Lines
The SR70 is designed to protect two data lines from
SR70 Pin Configuration
transient over-voltages by clamping them to a fixed
reference. When the voltage on the protected line
exceeds the reference voltage (plus diode V F ) the
steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Data lines are connected at pins 2 and 3. The nega-
tive reference (REF1) is connected at pin 1. This pin
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 (REF2) is connected at pin 4.
The options for connecting the positive reference are
as follows:
1
2
4
3
1. To protect data lines and the power line, connect
pins 2 and 3 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
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).
Data Line and Power Supply Protection Using Vcc as
reference
? 2003 Semtech Corp.
4
www.semtech.com
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