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RClamp0522P
RClamp0524P
PROTECTION PRODUCTS
Applications Information
Specification (CTS). In each case, the device meets
the HDMI CTS requirement of 100 Ohm ±15% with
plenty of margin.
For signal integrity purposes, the best results will be
obtained by using the RClamp0524P to protect the
high-speed differential pairs. This is because the
device is designed such that the data lines from the
connector line up with the I/O pins of the device
without altering the trace routing. The RClamp0504P
may be used to protect the remaining lines (I2C, CEC,
and hot plug).
Layout Guidelines for Optimum ESD Protection
Good circuit board layout is critical not only for signal
A
B
PRELIMINARY
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-
X-axis
Y-axis
A
1.905
101.0
B
2.081
107.0
(nsec)
(Ohm)
sible. This practice restricts ESD coupling into
adjacent traces and reduces parasitic inductance.
The ESD transient return path to ground should be
kept as short as possible. Whenever possible, use
multiple micro vias connected directly from the device
ground pad to the ground plane.
Avoid running critical signals near board edges.
Protecting MDDI Ports with RClamp0524P and
RClamp0522P
The small package size and low capacitance of the
RClamp0522P and RClamp0524P 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
RClamp0524P is used to protect two differential line
pairs while an RClamp0522P is used to protect the
MDDI strobe lines. Note that devices are used on
Figure 2 - TDR Measurement with 200ps risetime
using Semtech Evaluation Board
B
A
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
X-axis
Y-axis
A
1.80
96
B
2.076
108.0
(nsec)
(Ohm)
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 - TDR Measurement with 100ps 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).
? 2008 Semtech Corp.
7
www.semtech.com
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