CM1423
Secure Digital (SD) Card EMI Filter Array with ESD Protection
Features
Product Description
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Provides EMI filtering and ESD protection for an
SD port on a mobile device
Six channels of EMI filtering with ESD protection
Four channels of ESD protection
15kV ESD protection on all I/O pins (IEC 61000-
4-2, contact discharge)
30kV ESD protection (HBM)
Better than 25dB of attenuation at 1GHz for 12pF-
100Ω -12pF filter configuration
Integrates 34 components into small form factor
CSP solution
20-bump, 4.000mm x 1.458mm footprint
Chip Scale Package
Chip Scale Package features extremely low
lead inductance for optimum filter and ESD
performance
Available with OptiGuard™ coated version for
improved reliability at assembly
Lead-free version available
California Micro Devices's CM1423 is an EMI filter
array with ESD protection, which integrates six Pi- fil-
ters (C-R-C) and four channels of ESD protection. The
CM1423’s filters have component values of 12pF-
100Ω-12pF. The part includes ESD protection diodes
on every pin, which provide a very high level of protec-
tion for sensitive electronic components that may be
subjected to electrostatic discharge (ESD). All the
ESD diodes are designed and characterized to safely
dissipate ESD strikes of 15kV, beyond the maximum
requirement of the IEC 61000-4-2 international stan-
dard. Using the MIL-STD-883 (Method 3015) specifica-
tion for Human Body Model (HBM) ESD, the pins are
protected for contact discharges at greater than 30kV.
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This device is particularly well suited for portable elec-
tronics (e.g. mobile handsets, PDAs, notebook com-
puters) because of its small package format and easy-
to-use pin assignments. In particular, the CM1423 is
ideal for EMI filtering and protecting data lines from
ESD for the Secure Digital (SD) Card interface slot in
mobile handsets. The CM1423 is an all-inclusive solu-
tion for the SD card interface since its EMI filters pro-
vide the proper cut-off frequency to attenuate
unwanted signals.
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Applications
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Secure Digital (SD) Card data lines in mobile
handsets
SD Card interface protection for other mobile elec-
tronics such as MP3 players, PDAs and digital
cameras
I/O port protection for mobile handsets, notebook
computers, PDAs etc.
EMI filtering for data ports in cell phones, PDAs or
notebook computers.
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The CM1423 is manufactured in a space-saving, low-
profile, chip-scale package, and is optionally available
with OptiGuard™ coating for improved reliability. It is
also available with lead-free finishing.
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Electrical Schematic
100Ω
100Ω
100Ω
100Ω
100Ω
100Ω
A1
A2
A3
C1
C2
C3
A5
A7
A8
C5
C7
C8
A4
A6
C4
C6
DAT
DAT
2
3
DAT 2
CLK
CLK
VSS1*
VDD*
12pF
12pF
12pF
12pF
12pF
12pF
12pF
12pF
12pF
12pF
12pF
12pF
VSS2*
DAT 3 DAT 0
DAT 0
ESD*
CMD
DAT 1
CMD
DAT 1
* In a typical SD Card application, A4 (A6)
is connected to C4 (C6). See example
given in applications section.
© 2005 California Micro Devices Corp. All rights reserved.
01/12/05 430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com
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