California Micro Devices Launches microSD Interface Protection Filter for Mobile...

California Micro Devices Launches microSD Interface Protection Filter for
Mobile Handsets
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.

SOURCE California Micro Devices

Kyle Baker of California Micro Devices Corporation, +1-408-934-3117,
kyleb@cmd.com