California Micro Devices Launches microSD Interface Protection Filter for Mobile Handsets
July 07 2009 - 9:30AM
PR Newswire (US)
CM1624 Provides Excellent EMI Suppression, Lowest Line Capacitance
and Robust 15kV ESD Protection MILPITAS, Calif., July 7
/PRNewswire-FirstCall/ -- California Micro Devices (NASDAQ:CAMD)
today announced the CM1624, an application specific microSD (micro
Secure Digital) interface protection filter for mobile and
computing devices. The popular microSD flash memory card is
increasingly used in portable devices to allow users to store or
use data across different devices. The CM1624 protects the microSD
memory card user interface against ESD (electrostatic discharge)
damage to the card or to the hardware and suppresses EMI
(electromagnetic interference) while providing excellent digital
signal integrity. It is a member of the leading edge Praetorian
III(R) product line and combines outstanding filter performance
with minimal line capacitance. The CM1624 also features integrated
pull-up resistors, eliminating the need for additional circuitry on
the handset PCB (printed circuit board) and saving additional bill
of materials cost. (Photo:
http://www.newscom.com/cgi-bin/prnh/20090707/SF41127) Application
Specific for the microSD Interface Inductor based filter solutions
offer the highest level of digital signal integrity available. The
CM1624 can support clock frequencies up to 96 MHz, rise/fall times
as fast at 5 nSec, and high levels of attenuation from 700 MHz to 3
GHz. The CM1624 pinout is optimized for the microSD interface
standard and features 6 lines of EMI suppression with IEC 61000-4-2
+/-15kV (contact) integrated ESD protection, one line of through
package ESD protection for the Vcc line, and two additional
discrete ESD diodes for related functions such as Card Detect.
Additionally, CMD has integrated 25k ohms pull-up resistors to help
detect the presence of the memory card. EMI Filtering on a
Capacitive Budget As process geometries used in manufacturing
baseband and applications processors migrate to increasingly
smaller feature sizes, system operating voltages are also becoming
lower so that the amount of capacitive loading on the data lines
has become a major concern for handset designers. The microSD
interface specification allows for a total capacitive loading
budget of 40 pF and traditional filter architectures consume too
much of this tight design parameter. The CM1624 features a
specification 0V DC capacitance of 20pF, and less than 12 pF at
operating voltage - the lowest level of capacitance available in
EMI filters designed for the microSD interface. The lower filter
line capacitance affords handset designers greater design latitude
with respect to PCB routing and improved ease of design.
CM1624-08DE Features -- Very low line capacitance (12 pF) at
operating voltages -- Excellent signal integrity, rise times as
fast as 5 nSec with 75 MHz clocks in a 50 ohms environment --
Industry leading >15 kV contact ESD protection across all ports
-- Application specific, turnkey solution mated perfectly to the
microSD interface, including integrated pull-up resistors
Packaging, Pricing and Availability The CM1624-08DE is available in
an industry standard, compact, RoHS compliant microDFN16 package.
Samples and are available now and are priced at $0.16 each in
quantities of 3000 units. The CM1624 is qualified for mass
production now. About California Micro Devices Corporation
California Micro Devices Corporation is a leading supplier of
application specific analog and mixed signal semiconductor products
for the mobile handset, high brightness LED (HBLED), digital
consumer electronics and personal computer markets. Key product
lines include protection devices for mobile handsets, HBLEDs,
digital consumer electronics products and personal computers and
mixed signal ICs for mobile handset displays. Detailed corporate
and product information may be accessed at http://www.cmd.com/. The
CMD logo and Praetorian III are registered trademarks of California
Micro Devices Corporation. All other trademarks are property of
their respective owners.
http://www.newscom.com/cgi-bin/prnh/20090707/SF41127
http://photoarchive.ap.org/ DATASOURCE: California Micro Devices
CONTACT: Kyle Baker of California Micro Devices Corporation,
+1-408-934-3117, Web Site: http://www.cmd.com/
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