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PDF AOZ8808 Data sheet ( Hoja de datos )
| Número de pieza | AOZ8808 | |
| Descripción | Ultra-Low Capacitance TVS Diode | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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AOZ8808
Ultra-Low Capacitance TVS Diode
General Description
The AOZ8808 is a transient voltage suppressor array
designed to protect high speed data lines such as HDMI
1.4/2.0, USB 3.0, MDDI, SATA, and Gigabit Ethernet
from damaging ESD events.
This device incorporates eight surge rated, low
capacitance steering diodes and a TVS in a single
package. During transient conditions, the steering diodes
direct the transient to either the positive side of the power
supply line or to ground.
The AOZ8808 provides a typical line-to-line capacitance
of 0.3 pF and low insertion loss up to 6 GHz providing
greater signal integrity making it ideally suited for
HDMI 1.4/2.0 or USB 3.0 applications, such as Digital
TVs, DVD players, computing, set-top boxes and MDDI
applications in mobile computing devices.
The AOZ8808 comes in a RoHS compliant and Halogen
Free 2.5 mm x 1.0 mm x 0.55 mm DFN-10 package and
is rated for -40 °C to +85 °C junction temperature range.
Features
ESD protection for high-speed data lines:
– IEC 61000-4-2, level 4 (ESD) immunity test
– Air discharge: ±15 kV; contact discharge: ±15 kV
– IEC61000-4-4 (EFT) 40 A (5/50 nS)
– IEC61000-4-5 (Lightning) 4 A (8/20 µS)
– Human Body Model (HBM) ±24 kV
Array of surge rated diodes with internal TVS diode
Small package saves board space
Protects four I/O lines
Low capacitance between I/O lines: 0.3 pF
Low clamping voltage
Low operating voltage: 3.3V, 5.0 V
Applications
HDMI 1.4/2.0, USB 3.0, MDDI, SATA ports
Monitors and flat panel displays
Set-top box
Video graphics cards
Digital Video Interface (DVI)
Notebook computers
Typical Applications
AOZ8802A
D+
D-
USB 3.0
Transceiver
SSRX+
SSRX-
SSTX+
SSTX-
D+
D-
USB 3.0
Connector
SSRX+
SSRX-
SSTX+
SSTX-
AOZ8808
Figure 1. USB 3.0 Ports
AOZ8808
AOZ8808
TX2+
TX2-
TX1+
TX1-
HDMI 1.4/2.0
Transmitter
TX0+
TX0-
CLK+
CLK-
Connector Connector
RX2+
RX2-
RX1+
RX1-
HDMI 1.4/2.0
Receiver
RX0+
RX0-
CLK+
CLK-
AOZ8808
AOZ8808
Figure 2. HDMI 1.4/2.0 Ports
Rev. 4.0 January 2016
www.aosmd.com
Page 1 of 8
1 page  
AOZ8808
High Speed PCB Layout Guidelines
Printed circuit board layout is the key to achieving the
highest level of surge immunity on power and data lines.
The location of the protection devices on the PCB is the
simplest and most important design rule to follow. The
AOZ8808DI devices should be located as close as
possible to the noise source. The AOZ8808DI device
should be placed on all data and power lines that enter or
exit the PCB at the I/O connector. In most systems, surge
pulses occur on data and power lines that enter the PCB
through the I/O connector. Placing the AOZ8808DI
devices as close as possible to the noise source ensures
that a surge voltage will be clamped before the pulse can
be coupled into adjacent PCB traces. In addition, the
PCB should use the shortest possible traces. A short
trace length equates to low impedance, which ensures
that the surge energy will be dissipated by the
AOZ8808DI device. Long signal traces will act as
antennas to receive energy from fields that are produced
by the ESD pulse. By keeping line lengths as short as
possible, the efficiency of the line to act as an antenna for
ESD related fields is reduced. Minimize interconnecting
line lengths by placing devices with the most interconnect
as close together as possible. The protection circuits
should shunt the surge voltage to either the reference or
chassis ground. Shunting the surge voltage directly to the
IC’s signal ground can cause ground bounce. The
clamping performance of TVS diodes on a single ground
PCB can be improved by minimizing the impedance with
relatively short and wide ground traces. The PCB layout
and IC package parasitic inductances can cause
significant overshoot to the TVS’s clamping voltage. The
inductance of the PCB can be reduced by using short
trace lengths and multiple layers with separate ground
and power planes. One effective method to minimize
loop problems is to incorporate a ground plane in the
PCB design.
The AOZ8808DI ultra-low capacitance TVS is designed
to protect four high speed data transmission lines from
transient over-voltages by clamping them to a fixed
reference. The low inductance and construction
minimizes voltage overshoot during high current surges.
When the voltage on the protected line exceeds the
reference voltage the internal steering diodes are forward
biased, conducting the transient current away from the
sensitive circuitry. The AOZ8808DI is designed for ease
of PCB layout by allowing the traces to run underneath
the device. The pinout of the AOZ8808DI is designed to
simply drop onto the IO lines of a High Definition
Multimedia Interface (HDMI 1.4/2.0) or USB 3.0 design
without having to divert the signal lines that may add
more parasitic inductance. Pins 1, 2, 4 and 5 are
connected to the internal TVS devices and pins 6, 7, 9
and 10 are no connects. The no connects was done so
the package can be securely soldered onto the PCB
surface.
Clock
Clock
Data0
Data0
Ground
Ground
Data1
Data1
Data2
Data2
Figure 3. Flow Through Layout for HDMI 1.4/2.0
SSRX+
SSRX+
SSRX–
SSRX–
Ground
Ground
SSTX+
SSTX+
SSTX–
SSTX–
Figure 4. Flow Through Layout for USB 3.0
Rev. 4.0 January 2016
www.aosmd.com
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AOZ8808.PDF ] | |
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