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 incellular 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 40Ωis provided on the SDData0, SDData1, SDData2, SDData3, CMD, and CLK lines.

Features

• Bidirectional EMI/RFI filtering and line termination with integrated ESD protection

• Provides ESD protection to IEC61000-4-2:

• ±15kV contact discharge

• TVS working voltage: 5V

• Termination resistors: 40Ω

• Pull-up resistors: 25kΩ

• Typical capacitance per line: 12pF (VIN = 2.5V)

• Protection and termination for six lines + Vcc

• Solid-state technology

Applications

• T-Flash / MicroSD interfaces

• MMC interfaces

• CDMA, GSM, 3G cell phones