CM1421
4-Channel LCD EMI Filter Array plus
4-Channel ESD Protection Array
Features
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Functionally and pin compatible with CMD’s
CSPEMI607
Four channels of combined EMI/RFI filtering plus
ESD protection
Four additional channels of ESD-only protection
Better than 30dB attenuation (typical) at 1 GHz
±15kV
ESD protection on all channels
(IEC 61000-4-2 Level 4, contact discharge)
±30kV
ESD protection on all channels (HBM)
Chip Scale Package features extremely low
lead inductance for optimum filter and ESD
performance
15-bump, 2.960mm X 1.330mm footprint
Chip Scale Package (CSP)
Optiguard
™
coated for improved reliability
Lead-free version available
Product Description
The CM1421 is a multichannel array consisting of four
low-pass filters with integrated ESD protection and four
ESD-only protection channels designed to reduce EMI/
RFI emissions on LCD data lines in mobile handsets.
The CM1421 has component values of 15pF-100Ω-
15pF. These devices include ESD protection diodes on
every pin, which provide a very high level of protection
for sensitive electronic components that may be sub-
jected to electrostatic discharge (ESD). The ESD
diodes connected to the filter ports are designed and
characterized to safely dissipate ESD strikes of ±15kV,
beyond the maximum requirement of the IEC 61000-4-
2 international standard. Using the MIL-STD-883
(Method 3015) specification for Human Body Model
(HBM) ESD, the pins are protected for contact dis-
charges at greater than ±30kV.
This device is particularly well suited for portable elec-
tronics (e.g. wireless handsets, PDAs, notebook com-
puters) because of its small package format and easy-
to-use pin assignments. In particular, the CM1421 is
ideal for EMI filtering and protecting data lines from
ESD for the LCD display in clamshell handsets.
The CM1421 incorporates Optiguard
™
coating which
results in improved reliability. The CM1421 is available
in space-saving, low-profile chip-scale packages with
optional lead-free finishing.
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Applications
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LCD data lines in mobile handsets
EMI filtering and ESD protection for both data and
I/O ports
Mobile Handsets
Handheld PCs / PDAs
Notebook Computers
Electrical Schematic
100Ω
FILTER+ESDn*
15pF
15pF
FILTER+ESDn*
ESDn*
15pF
GND
(Pins B1-B3)
1 of 4 EMI/RFI + ESD Channels.
1 of 4 ESD-only Channels
* See Package/Pinout Diagram for expanded pin information
© 2004 California Micro Devices Corp. All rights reserved.
04/27/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
