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RCLAMP0544M Schematic ( PDF Datasheet ) - Semtech Corporation

Teilenummer RCLAMP0544M
Beschreibung ESD Protection
Hersteller Semtech Corporation
Logo Semtech Corporation Logo 




Gesamt 11 Seiten
RCLAMP0544M Datasheet, Funktion
PROTECTION PRODUCTS - RailClamp
www.DataSheet4U.com
Description
RClamp0544M
RailClamp
ESD Protection for HDMI Interfaces
PRELIMINARY
Features
RailClamps are ultra low capacitance TVS arrays
designed to protect high speed data interfaces. This
series has been specifically designed to protect sensi-
tive 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).
The RClampTM0544M has a typical capacitance of only
0.30pF. This means it can be used on circuits operating
in excess of 2GHz without signal attenuation. They may
be used to meet the ESD immunity requirements of IEC
61000-4-2, Level 4 (±15kV air, ±8kV contact discharge).
These devices are in a MSOP 10L package and feature a
lead-free, matte tin finish. They are compatible with both
lead free and SnPb assembly techniques. They are de-
signed for easy PCB layout by allowing the traces to run
straight through the device. The combination of small
size, low capacitance, and high level of ESD protection
makes them a flexible solution for protecting high-speed
HDMI and DVI video interfaces.
‹ ESD protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±18kV (air), ±12kV (contact)
IEC 61000-4-5 (Lightning) 5A (8/20µs)
IEC 61000-4-4 (EFT) 40A (5/50ns)
‹ Array of surge rated diodes with internal TVS Diode
‹ Small package saves board space
‹ Protects four I/O lines and one Vcc line
‹ Low capacitance: 0.3pF typical (I/O to I/O)
‹ Low clamping voltage
‹ Low operating voltage: 5.0V
‹ Solid-state silicon-avalanche technology
Mechanical Characteristics
‹ JEDEC MSOP 10L package
‹ Molding compound flammability rating: UL 94V-0
‹ Marking : Marking code and date code
‹ Packaging : Tape and Reel per EIA 481
‹ Lead Finish: Matte Tin
‹ RoHS/WEEE Compliant
Applications
‹ High Definition Multi-Media Interface (HDMI)
‹ Digital Visual Interface (DVI)
‹ 10/100/1000 Ethernet
‹ Monitors and Flat Panel Displays
‹ Notebook Computers
‹ Set Top Box
‹ Projection TV
Circuit Diagram
Schematic & PIN Configuration
Pin 8
Pin 1
Pin 2
Pin 4
Pin 5
Pin 3
Revision 01/19/2006
Line 1 1
Line 2
GND
Line 3
Line 4
NC
NC
Vcc
NC
NC
MSOP-10L (Top View)
1 www.semtech.com






RCLAMP0544M Datasheet, Funktion
RClamp0544M
PROTECTION PRODUCTS
Appwlwiwc.aDattiaoSnheset4IUn.cfoomrmation (continued)
ESD Protection With RailClamps
RailClamps are optimized for ESD protection using the
rail-to-rail topology. Along with good board layout, these
devices virtually eliminate the disadvantages of using
PdsiidIsNcerreDttheeecssocimtruipapottinoioennnstshsotwo niminplFeimguernet4thwishteorpeodloisgcyr.eCteon-
diodes or diode arrays are configured for rail-to-rail
protection on a high speed line. During positive duration
ESD events, the top diode will be forward biased when
the voltage on the protected line exceeds the reference
voltage plus the VF drop of the diode. For negative
events, the bottom diode will be biased when the voltage
exceeds the VF of the diode. At first approximation, the
clamping voltage due to the characteristics of the protec-
tion diodes is given by:
PRELIMINARY
Figure 4 - “Rail-To-Rail” Protection Topology
(First Approximation)
VC = VCC + VF (for positive duration pulses)
VC = -VF
(for negative duration pulses)
However, for fast rise time transient events, the effects of
parasitic inductance must also be considered as shown
in Figure 5. Therefore, the actual clamping voltage seen
by the protected circuit will be:
VC = VCC + VF + LP diESD/dt (for positive duration pulses)
VC = -VF - LG diESD/dt
(for negative duration pulses)
ESD current reaches a peak amplitude of 30A in 1ns for
a level 4 ESD contact discharge per IEC 61000-4-2.
Therefore, the voltage overshoot due to 1nH of series
inductance is:
Figure 5 - The Effects of Parasitic Inductance
When Using Discrete Components to Implement
Rail-To-Rail Protection
V = LP diESD/dt = 1X10-9 (30 / 1X10-9) = 30V
Example:
Consider a VCC = 5V, a typical VF of 30V (at 30A) for the
steering diode and a series trace inductance of 10nH.
The clamping voltage seen by the protected IC for a
positive 8kV (30A) ESD pulse will be:
Figure 6 - Rail-To-Rail Protection Using
RailClamp TVS Arrays
dissipation capability of the discrete diode will be ex-
ceeded, thus destroying the device.
VC = 5V + 30V + (10nH X 30V/nH) = 335V
This does not take into account that the ESD current is
directed into the supply rail, potentially damaging any
components that are attached to that rail. Also note
that it is not uncommon for the VF of discrete diodes to
exceed the damage threshold of the protected IC. This is
due to the relatively small junction area of typical dis-
crete components. It is also possible that the power
The RailClamp is designed to overcome the inherent
disadvantages of using discrete signal diodes for ESD
suppression. The RailClamp’s integrated TVS diode
helps to mitigate the effects of parasitic inductance in
the power supply connection. During an ESD event, the
current will be directed through the integrated TVS diode
to ground. The maximum voltage seen by the protected
IC due to this path will be the clamping voltage of the
device.
2006 Semtech Corp.
6
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