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RClamp0502N
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Two High-
Speed Data Lines
Data line inputs are normally connected at pins 4 & 5
with the outputs connected at pins 2 & 3. Pin 1 is
connected to ground. Note that the circuit at the ground
pin is identical to the circuit at each data input/output
Figure 1- Pin Configuration & Circuit Diagram
6
pin. This is done to further reduce capacitance. The
connection to ground should be made directly to a
1
4
5
ground plane. The path length should also be kept as
short as possible to minimize parasitic inductance. Pin
6 can be connected to Vcc biased or left not connected
depending upon the application.
Protecting USB 2.0 Interfaces
The USB interface consists of Data (D- and D+) lines and
a 5.25V voltage bus. Since these pins are part of the
connector, they are vulnerable to ESD and cable
discharge events. The RClamp0502N is designed to
Figure 2 - USB 2.0 High Speed Protection
protect all four USB connections (VCC, D-, D+, and Gnd).
Each device will protect one USB port. When the voltage
on the data lines exceed the bus voltage (plus one diode
drop), the internal rectifiers are forward biased
conducting the transient current away from the
protected controller chip. The TVS diode directs the
surge to ground. The TVS diode also acts to suppress
GND (Pin 1)
NC (Pin 2)
NC (Pin 3)
VBus (Pin 6)
D+ or D- (Pin 5)
D+ or D- (Pin 4)
ESD strikes directly on the voltage bus. Thus, both
power and data pins are protected with a single device.
USB Controller
USB Connector
D-
D+
Pin 1
Pin 2
Pin 3
Pin 6
Pin 5
Pin 4
Vbus
D-
D+
Gnd
? 2008 Semtech Corp.
4
www.semtech.com
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