8052P Datasheet, PDF (5/9 Pages) Gennum Corporation – Low ESD Clamping Voltage

Application Information
USB Interface Protection
EClamp8052P may be used to protect D+ and D- lines
against ESD and EMI in USB 2.0, USB 3.0, and USB 3.1
applications.USB D+ and D- lines enter at pins 1 and 2
(connector side) and exit at pins 4 and 5.The TVS diodes
are internally connected at pins 1 and 2 and therfore
must be located towards the connector on the PCB.Pin 3
is connected to the ground plane.Figures 1 is an exam-
ple of protecting a USB 3.0 Type-A interface (host side
shown).
For USB 3.0 applications, RClamp3324T is recommended
for protecting the 5Gb/s SuperSpeed line pairs.Lines
are routed through the device at pins 1-4.Traces should
be kept the same length to avoid impedance mismatch.
Ground is connected at pins 5 and 6. The differential
impedance of each pair can be controlled for USB 3.0 (85
Ohms +/-15%) while maintaining a minimum trace-to-
trace and trace-to-pad spacing.Individual PCB design
constraints may necessitate different spacing or trace
width. Both ground pads should be connected for op-
timal performance.Ground connection is made using
filled via-in-pad.Additional information may be found on
the device data sheet.
Single line devices such as uClamp0571P are recom-
mended for surge and ESD protection of the VBus line.
This device features high surge and ESD capability and
may be used on 5V power rails.
Device Placement
Placement of the protection component is a critical ele-
ment for effective ESD suppression. TVS diodes should
be placed as close to the connector as possible.This
helps reduce transient coupling to nearby traces.
Ground connections should be made directly to the
ground plane using micro-vias.This reduces parasitic
inductance in the ground path and minimizes the clamp-
ing voltage seen by the protected device.
GND
SSRX-
D+
SSRX+
D-
GND
EClamp8052P
1
5
R
2
4
R
3
RClamp3324T
VBus
SSTX-
SSTX+
USB 3.0 - Type A
Host Connector
uClamp0571P
Figure 1 - USB 3.0 Type-A Protection Example
EClamp8052P
Final Datasheet
May 7, 2015
Rev 4.0
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