SRV05-4 View Datasheet(PDF) - Shanghai Leiditech Electronic Technology Co., Ltd
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SRV05-4
Applications Information (Continue)
Applications Information
Figure 4．Video Interface Protection
SRV05-4
SRV05-4
Figure 5 - Dual USB Port Protection
SRV05-4
Figure 6 - SIM Port
SRV05-4
Video Interface Protection
Video interfaces are susceptible to transient voltages
resulting from electrostatic discharge (ESD) and “hot
plugging” cables. If left unprotected, the video interface
IC may be damaged or even destroyed. Protecting a
high-speed video port presents some unique challenges.
First, any added protection device must have extremely
low capacitance and low leakage current so that the
integrity of the video signal is not compromised. Second,
the protection component must be able to absorb high
voltage transients without damage or degradation. As a
minimum, the device should be rated to handle ESD
voltages per IEC61000-4-2, level 4 (±15kV air, ±8kV
contact). The clamping voltage of the device (when
conducting high current ESD pulses) must be sufficiently
low enough to protect the sensitive CMOS IC. If the
clamping voltage is too high, the “protected” device may
latch-up or be destroyed. Finally, the device must take up
a relatively small amount of board space, particularly in
portable applications such as notebooks and handhelds.
The SRV05-4 is designed to meet or exceed all of the
above criteria. A typical video interface protection circuit
is shown in Figure 4. All exposed lines are protected
including R, G, B, H-Sync, V-Sync, and the ID lines for
plug and play monitors.
Universal Serial Bus ESD Protection
The SRV05-4 may also be used to protect the USB ports
on monitors, computers, peripherals or portable systems.
Each device will protect up to two USB ports (Figure5).
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 ESD strikes directly on the voltage bus.
Thus, both power and data pins are protected with a
single device.
Rev : 01.06.2014
4/7
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