MEDIA RELEASE PR35273
California Micro Devices Launches microSD Interface Protection Filter for Mobile Handsets
MILPITAS, Calif., July 7 /PRNewswire-AsiaNet/ --
CM1624 Provides Excellent EMI Suppression, Lowest Line
Capacitance and Robust 15kV ESD Protection
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.
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
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
CONTACT: Kyle Baker of California Micro Devices Corporation
+1-408-934-3117
kyleb@cmd.com
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