CM1624 Datasheet, PDF (2/10 Pages) ON Semiconductor – Praetorian III EMI Filter for T-Flash/MicroSD Interfaces

CM1624
Description
The CM1624 is a combination EMI filter and line termination device with integrated TVS diodes for use on
Multimedia Card interfaces. This state-of-the-art device utilizes solid-state, silicon-avalanche technology for
superior clamping performance and DC electrical characteristics. The CM1624 has been optimized for
protection of T-Flash/MicroSD interfaces in cellular phones and other portable electronics.
The CM1624 consists of six circuits that includes series impedance matching resistors and pull-up resistors as
required by the SD specification. TVS diodes are included on each line for ESD protection. An additional TVS
diode connection is included for protection of the voltage (Vcc) bus. Termination resistor value of 40Ω is
provided on the SDData0, SDData1, SDData2, SDData3, CMD, and CLK lines.
Pull-up resistors of 25kΩ are included on the SDData0, SDData1, SDData2, SDData3 and CMD lines, as well.
These may be configured for devices operating in SD or SPI mode. The TVS diodes provide effective
suppression of ESD voltages in excess of ±15kV (contact discharge) per IEC 61000-4-2, level 4. The CM1624 is
in a 16-pin, RoHS/WEEE compliant, UDFN 16-pin package. It measures 3.30 x 1.35 x 0.50mm. The leads are
spaced at a pitch of 0.4mm and are finished with lead-free NiPd.
Package/Pin Information
Top View
SDData1 ₁
SDData0
SDCLK
ESD1
ESD3
SDCMD
SDData3
SDData2
Data1
Data0
CLK
ESD1
VCC
CMD
Data3
Data2
Rev. 2 | Page 2 of 10 | www.onsemi.com