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ESD/EMI Protection for Color LCD Interfaces
PROTECTION PRODUCTS - EMIClamp(R) Description
The EClamp(R) 2508K device is a low pass filter array with integrated TVS diodes. It is designed to suppress unwanted EMI/RFI signals and provide electrostatic discharge (ESD) protection in portable electronic equipment. This state-of-the-art device utilizes solidstate silicon-avalanche technology for superior clamping performance and DC electrical characteristics. They have been optimized for protection of color LCD panels in cellular phones and other portable electronics. The device consists of eight identical circuits comprised of TVS diodes for ESD protection, and a 3-pole inductor - capacitor network for EMI/RFI filtering. A typical inductor value of 17nH and a capacitor value of 12pF are used to achieve 20dB minimum attenuation from 800MHz to 2.7GHz. The TVS diodes provide effective suppression of ESD voltages in excess of 15kV (air discharge) and 8kV (contact discharge) per IEC 61000-4-2, level 4. The ECLAMP2508K is in a 16-pin, SLP3313P16 package. It measures 3.3 x 1.3 x 0.50mm. The leads are spaced at a pitch of 0.4mm and are finished with leadfree NiPdAu. The small package makes it ideal for use in portable electronics such as cell phones, digital still cameras, and PDAs.
ECLAMP2508K
PRELIMINARY
Features
Bidirectional EMI/RFI filter with integrated TVS for ESD protection
ESD protection to IEC 61000-4-2 (ESD) Level 4, 15kV (air), 8kV (contact) Filter performance: 20dB minimum attenuation 800MHz to 2.7GHz TVS working voltage: 5V Inductor: 17nH (Typical) Capacitors: 12pF (Typical at VR = 2.5V) Protection and filtering for eight lines Solid-state technology
Mechanical Characteristics
SLP3313P16 16-pin package PB-Free, Halogen Free, RoHS/WEEE Compliant Nominal Dimensions: 3.3 x 1.3 x 0.50mm Lead Pitch: 0.4mm Lead finish: NiPdAu Marking : Marking Code and Date Code Packaging : Tape and Reel
Applications
Color LCD Protection Cell Phone CCD Camera Lines Clamshell Cell Phones
Circuit Diagram (Each Line)
Package Configuration
3.30
17nH
1
2
IN
12pF 12pF
OUT
1.30
0.40 BSC
GND
0.50
Device Schematic (8X)
Revision 04/14/2010
16 Pin SLP package (Bottom Side View) Nominal Dimensions in mm
1 www.semtech.com
ECLAMP2508K
PROTECTION PRODUCTS Maximum Ratings
R ating ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) Junction Temp erature Op erating Temp erature Storage Temp erature Symbol VESD TJ Top TSTG Value +/- 20 +/- 15 125 -40 to +85 -55 to +150
PRELIMINARY
Units kV
o
C C C
o
o
Electrical Characteristics (T = 25oC)
P ar am et er T VS Reverse Stand-Off Voltage T VS Reverse Breakdown Voltage T VS Reverse Leakage Current DC Resistance Filter Cut-Off Frequency Inductance Capacitance Total Capacitance S y m b ol VRWM V BR IR RDC fc L C1 , C2 C1 + C2 VR = 2.5V, f = 1MHz Input to Gnd, Each Line VR = 2.5V, f = 1MHz 10 20 ZSource = ZLoad = 50 Ohms It = 1mA VRWM = 3.3V 6 8 0.03 18 250 17 12 24 15 30 Con d i t i on s Mi n i mu m Ty p i c a l M ax i m u m 5 10 0.1 Units V V A Ohms MHz nH pF pF
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS Typical Characteristics
Typical Insertion Loss S21 (Each Line)
CH1 S21 LOG 6 dB / REF 0 dB 1: -4. 46 dB 250 MHz 2: -26.206 dB 800 MHz
1
PRELIMINARY
Analog Crosstalk (Each Line)
CH1 S21 LOG 20 dB /REF 0 dB
0 dB -6 dB -12 dB -18 dB -24 dB -30 dB -36 dB -42 dB -48 dB 1 MHz START . 030 MHz 10 MHz 100 MHz
2 3 4
3: -34.349 dB 1.8 GHz 4: -33.371 dB 2.7 GHz
1 3 GHz GHz STOP 3 000. 000000 MHz
START . 030 MHz
STOP 3 000. 000000 MHz
ESD Clamping (+8kV Contact)
ESD Clamping (-8kV Contact)
Note: Data is taken with a 10x attenuator
Note: Data is taken with a 10x attenuator
Capacitance vs. Reverse Voltage (Normalized to 2.5 volts)
2
1.5
CJ(VR) / CJ(VR=2.5)
1
0.5
f = 1 MHz
0 0 1 2 3 4 5
Reverse Voltage - VR (V)
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS
Device Connection The ECLAMP2508K is comprised of four identical circuits each consisting of a low pass filter for EMI/RFI suppression and dual TVS diodes for ESD protection. The device is in a 16-pin SLP package. Electrical connection is made to the 16 pins located at the bottom of the device. A center tab serves as the ground connection. The device has a flow through design for easy layout. Pin connections are noted in Figure 1. All path lengths should be kept as short as possible to minimize the effects of parasitic inductance in the board traces. Recommendations for the ground connection are given below. Ground Connection Recommendation Parasitic inductance present in the board layout will affect the filtering performance of the device. As frequency increases, the effect of the inductance becomes more dominant. This effect is given by Equation 1. Equation 1: The Impedance of an Inductor at Frequency XLF
PRELIMINARY
Figure 1 - Pin Identification and Configuration (Top Side View)
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
Pin 1-8 9 - 16 Center Tab
1
16
Gnd
8
9
Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8
Identification Inp ut Lines Outp ut Lines Ground
XLF(L, f ) = 2 * * f * L
Where: L= Inductance (H) f = Frequency (Hz) Via connections to the ground plane form rectangular wire loops or ground loop inductance as shown in Figure 2. Ground loop inductance can be reduced by using multiple vias to make the connection to the ground plane. Bringing the ground plane closer to the signal layer (preferably the next layer) also reduces ground loop inductance. Multiple vias in the device ground pad will result in a lower inductive ground loop over two exterior vias. Vias with a diameter d are separated by a distance y run between layers separated by a distance x. The inductance of the loop path is given by Equation 2. Thus, decreasing distance x and y will reduce the loop inductance and result in better high frequency filter characteristics.
Figure 2 - Inductance of Rectangular Wire Loops
Ground Via 1
Ground Via 2 d x Signal Layer
y
Ground Layer Layer
Equation 2: Inductance of Rectangular Wire Loop
Where: d = Diameter of the wire (in) x = Length of wire loop (in) y = Breath of wire loop (in)
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS Applications Information
Figure 3 shows the recommended device layout. The ground pad vias have a diameter of 0.008 inches (0.20 mm) while the two external vias have a diameter of 0.010 inches (0.250mm). The internal vias are spaced approximately evenly from the center of the pad. The designer may choose to use more vias with a smaller diameter (such as 0.005 inches or 0.125mm) since changing the diameter of the via will result in little change in inductance (i.e. the log function in Equation 2 is highly insensitive to parameter d) . Figure 4 shows a typical insertion loss (S21) plot for the device using Semtech's filter evaluation board with 50 Ohm traces and the recommended via configuration.
PRELIMINARY
Figure 4 - Filter Characteristics Using Recommended Layout with Internal Vias
CH1 S21 LOG 6 dB / REF 0 dB 1: -4. 46 dB 250 MHz 2: -26.206 dB 800 MHz
1
0 dB -6 dB -12 dB -18 dB -24 dB -30 dB -36 dB -42 dB
2 3 4
3: -34.349 dB 1.8 GHz 4: -33.371 dB 2.7 GHz
Figure 3 - Recommended Layout Using Ground Vias
-48 dB
1 MHz START . 030 MHz
10 MHz
100 MHz
3 1 GHz GHz STOP 3 000. 000000 MHz
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS Applications Information - Spice Model PRELIMINARY
Line In
0.5nH
L
16nH
0.5nH
Line Out
ECLAMP2508K Spice Model
ECLAMP2508K Spice Parameters Parameter IS BV VJ RS IB V CJO TT M N EG Unit Amp Volt Volt Ohm Amp Farad sec --eV D1 (T VS) 1.48E-14 7.44 0.75 0.53 1E-3 19.4E-12 2.541E-9 0.25 1.1 1.11 D2 (T VS) 1.48E-14 7.44 0.75 0.53 1E-3 19.4E-12 2.541E-9 0.25 1.1 1.11
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS Outline Drawing - SLP3313P16 PRELIMINARY
A
D
B
DIM
PIN 1 INDICATOR (LASER MARK) E
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.018 .020 .022 .000 .001 .002 (.005) .006 .008 .010 .128 .130 .133 .110 .114 .118 .049 .051 .054 .008 .012 .016 .016 BSC .008 .010 .012 16 .003 .004 0.45 0.50 0.55 0.00 0.02 0.05 (0.13) 0.15 0.20 0.25 3.25 3.30 3.375 2.80 2.90 3.00 1.25 1.30 1.375 0.20 0.30 0.40 0.40 BSC 0.20 0.25 0.30 16 0.08 0.10
A aaa C A2 A1 C
SEATING PLANE
A A1 A2 b D D1 E E1 e L N aaa bbb
D1 1 E1 N e e/2 D/2 bxN bbb CAB 2 LxN E/2
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
Land Pattern - SLP3313P16
P
X
DIMENSIONS DIM C G H K P X Y Z INCHES (.050) .027 .012 .118 .016 .008 .023 .073 MILLIMETERS (1.27) 0.69 0.30 3.00 0.40 0.20 0.58 1.85
Z
G Y K
H (C)
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
(c) 2010 Semtech Corp.
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ECLAMP2508K
PROTECTION PRODUCTS Marking PRELIMINARY Ordering Information
Part Number Qty per Reel 3000 R eel Size 7 Inch
PIN 1 INDICATOR
2508K
YYWW
EClamp 2508K.TCT
EMIClamp and EClamp are marks of Semtech Corporation
Note: YYWW = Date Code
Tape and Reel Specification
Pin 1 Location
User Direction of feed
Device Orientation in Tape
A0 1.51 +/-0.10 mm B0 3.51 +/-0.10 mm K0 0.66 +/-0.10 mm
Tape Width
B, (Max)
D 1.5 + 0.1 mm - 0.0 mm (0.59 +.005 - .000)
D1
E 1.750.10 mm (.069.004)
F
K (MAX)
P 4.00.1 mm (.157.004)
P0 4.00.1 mm (.157.004)
P2
T(MAX)
W 8.0 mm + 0.3 mm - 0.1 mm (.312.012)
8 mm
4.2 mm (.165)
0.8 mm 0.05 (.031)
3.50.05 mm (.138.002)
2.4 mm (.094)
2.00.05mm (.079.002)
0.4 mm (.016)
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
(c) 2010 Semtech Corp. 8 www.semtech.com

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