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PDF RCLAMP0502A Data sheet ( Hoja de datos )
| Número de pieza | RCLAMP0502A | |
| Descripción | Low Capacitance TVS Array | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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PROwwTwE.DCaTtaISOheNet4UP.cRomODUCTS - RailClamp®
Description
The RailClamp® series consists of ultra low capacitance
TVS arrays designed to protect high speed data inter-
faces. This series has been specifically designed to
protect sensitive components which are connected to
high-speed data and transmission lines from overvoltage
caused by ESD (electrostatic discharge), CDE (Cable
Discharge Events), and EFT (electrical fast transients).
They are designed for use in applications where board
space is at a premium. Each device requires less than
2.9mm2 of PCB area and will protect two high speed
data lines.
The monolithic design incorporates surge rated, low
capacitance steering diodes and a TVS diode in a single
package. Each line has a typical capacitance of 0.9pF to
ground and 0.3pF between lines. The capacitance of
each line is well matched for consistant signal balance.
Signal integrity is further preserved with the flow through
design. A connection to the TVS is provided for protec-
tion of external voltage busses, such as those found in
USB applications. This device is optimized for ESD
protection of portable electronics. They may be used to
meet the ESD immunity requirements of IEC 61000-4-2,
Level 4 (±15kV air, ±8kV contact discharge).
The RClamp0502A is in a 6-pin, RoHS/WEEE compli-
ant, SC-89 (SOT-666) package. It measures 1.6 x 1.6
x 0.6mm. The leads are finished with lead-free matte
tin. The small package makes it ideal for use in por-
table electronics such as cell phones, laptops, and
digital still cameras.
Circuit Diagram
RClamp0502A
RailClamp®
Low Capacitance TVS Array
Features
Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
Flow through design for ease of layout for high
speed data line application
Protects up to two I/O lines & power line
Low capacitance (<0.9pF) for high-speed interfaces
Ultra-small package requires less than 2.9mm2 of
PCB area
Low leakage current and clamping voltage
Low operating voltage: 5.0V
Solid-state silicon-avalanche technology
Mechanical Characteristics
SC-89 (SOT-666) package
RoHS/WEEE Compliant
Lead Finish: matte tin
Molding compound flammability rating: UL 94V-0
Marking: A
Packaging: Tape and Reel
Applications
USB 2.0 High Speed
10/100/1000 Ethernet Ports
High-Definition Multimedia Interface (HDMI)
Digital Visual Interface (DVI)
Monitors and Flat Panel Displays
Video Graphics Cards
IEEE 1394 Firewire Ports High Speed
Schematic & PIN Configuration
Pin 3 & 4
Pin 5
Revision 06/28/2008
Pin 2
Pin 1 & 6
1
16
25
34
SC-89 6L (Top View)
www.semtech.com
1 page  
PROTECTION PRODUCTS
Appwlwicw.aDtaitaoSnhesetI4nUf.coormmation
Device Connection Options for Protection of Two
High-Speed Data Lines
This device is designed to protect data lines by
clamping them to a fixed reference. When the voltage
on the protected line exceeds the reference voltage
the steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Data lines are connected at pins 1 & 6 and pins 3 & 4.
Pins 5 and 2 can be connected to ground or Vcc based
on application and location of those connections. The
connection to ground should be made directly to a
ground plane. The path length should also be kept as
short as possible to minimize parasitic inductance.
Figure 1 shows the layout configuration to send data
input at pins 6 and 4 and output at pins 1 and 3.
This device is designed for ease of PCB layout by
allowing the traces run straight through the device.
Figure 2 shows the proper way to design the PCB
board trace in order to use the flow through layout for
two line pairs. The solid line represents the PCB trace.
Note the PCB traces are used to connect the pin pairs
for each I/O (pin 1 to pin 6 and pins 3 to pin 4). For
example, I/O 1 enters at pin 6 and exits at pin 1 and
the PCB trace connects pins 6 and 1 together. This is
also true for I/O 2. The negative reference (Gnd) is
connected at pin 2. The positive reference is
connected at pin 5.
Universal Serial Bus ESD Protection
The RClamp0502A may also be used to protect both
upstream and downstream USB ports on monitors,
computers, peripherals or portable systems. Each
device will protect up to one USB port (Figure 3). 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.
RClamp0502A
Figure 1. Protection of Two Data Lines
and One Power Supply Line
Figure 2. Flow Through Layout for
Two Data Lines and one Power Line
Figure 3. USB 2.0 (up to 480Mbps)
Upstream or Downstream Port Protection
D+
to protected Circuit
1
Gnd 2
D-
to protected Circuit
3
6 D+
5 Vcc
4 D-
© 2008 Semtech Corp.
5
www.semtech.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RCLAMP0502A.PDF ] | |
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