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RClamp0522PA
RClamp0524PA
PROTECTION PRODUCTS
Applications Information
Design Recommendations for HDMI Protection
Adding external ESD protection to HDMI ports can be
challenging. First, ESD protection devices have an
inherent junction capacitance. Furthermore, adding
PRELIMINARY
even a small amount of capacitance will cause the
impedance of the differential pair to drop. Second,
large packages and land pattern requirements cause
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discontinuities that adversely affect signal integrity.
The RClamp0524PA and RClamp0522PA are
specifically designed for protection of high-speed
interfaces such as HDMI. They present <0.4pF
capacitance between the pairs while being rated to
handle >±8kV ESD contact discharges (>±15kV air
discharge) as outlined in IEC 61000-4-2. Each device
is in a leadless SLP package that is less than 1.1mm
wide. They are designed such that the traces flow
straight through the device. The narrow package and
flow-through design reduces discontinuities and
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3
2
1
GND
1
GND
GND
GND
minimizes impact on signal integrity. This becomes
even more critical as signal speeds increase.
Pin Configuration
Figure 1 is an example of how to route the high speed
differential traces through the RClamp0524PA. The
solid line represents the PCB trace. The PCB traces
are used to connect the pin pairs for each line (pin 1 to
pin 10, pin 2 to pin 9, pin 4 to pin 7, pin 5 to pin 6).
For example, line 1 enters at pin 1 and exits at Pin 10
and the PCB trace connects pin 1 and 10 together.
This is true for lines connected at pins 2, 4, and 5 also.
Ground is connected at pins 3 and 8. One large
ground pad should be used in lieu of two separate
pads. The same layout rules apply for the
RClamp0522PA.
TDR Measurements for HDMI
The combination of low capacitance, small package, and
flow-through design means it is possible to use these
devices to meet the HDMI impedance requirements of
100 Ohms ±15% without any PCB board modification.
Figure 3 shows a typical impedance test result for a
TDR risetime of 200ps using a Semtech evaluation
board with 100 Ohm traces throughout. Measure-
ments were taken using a TDR method as outlined in
the HDMI Compliance Test Specification (CTS). In each
Figure 1. Flow through Layout Using
p0524P
R Clamp052 4PA
? 2010 Semtech Corp.
6
www.semtech.com
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