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RClamp0522PA
RClamp0524PA
PROTECTION PRODUCTS
Applications Information
case, the device meets the HDMI CTS requirement of
100 Ohm ±15% with plenty of margin.
Figure 3 shows a typical HDMI 1.3 eye pattern at
1080p resolution. As shown there are no violations of
the eye pattern with RClamp0524PA in the circuit. The
RClamp0524PA may also be used to protect the
remaining lines (I2C, CEC, and hot plug). Figure 4
shows the complete protection solution.
Layout Guidelines for Optimum ESD Protection
Good circuit board layout is critical not only for signal
integrity, but also for effective suppression of ESD in-
duced transients. For optimum ESD protection, the
following guidelines are recommended:
Place the device as close to the connector as pos-
sible. This practice restricts ESD coupling into
PRELIMINARY
adjacent traces and reduces parasitic inductance.
The ESD transient return path to ground should be
kept as short as possible. Whenever possible, use
X-axis
Y-axis
1.79
98.3
(nsec)
(Ohm)
multiple micro vias connected directly from the device
ground pad to the ground plane.
Avoid running critical signals near board edges.
Figure 2 - TDR Measurement with 200ps risetime
using Semtech Evaluation Board
Note: Measurements were taken on SLP HDMI EVAL Rev C Board that has 100 Ω
differential traces impedance throughout (No trace Compensation).
Protecting MDDI Ports with RClamp0524P and
RClamp0522P
The small package size and low capacitance of the
RClamp0522PA and RClamp0524PA make them ideal
for high-speed lines in portable applications. One such
application is the protection of MDDI ports in cellular
phones. MDDI is a serial data interface operating at
480Mb/s per line pair. The lines are scalable for
increased speed and display resolution. A MDDI port
protection example is shown in Figure 5. The
RClamp0524PA is used to protect two differential line
pairs while an RClamp0522PA is used to protect the
MDDI strobe lines. Note that devices are used on
both the main board and LCD side of the MDDI port.
Devices on the main board are needed to protect the
MDDI controller in the Baseband processor and
devices on the LCD board to protect MDDI controller in
LCD module. A single line TVS such as the
uClamp0501P is used to protect the MDDI power line.
The protection devices should be placed close to the
connector of each board. Traces are routed directly
through each device, minimizing parasitic inductance.
Connections to the ground plane should be made with
multiple micro vias when possible.
Figure 3 - Typical HDMI 1.3 Eye Pattern (1080p)
with RClamp0524PA
? 2010 Semtech Corp.
7
www.semtech.com
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