FSSD06BQX

Specialized ICS Overview

The FSSD06BQX is a two-port multiplexer switch designed for SD, SDIO, and MMC interfaces. It enables multiple card or peripheral connections to a single host controller by multiplexing CMD, CLK, and D[3:0] signals. The device supports 1-bit and 4-bit configurations with VDDH operating from 1.65V to 3.6V. Key electrical characteristics include a typical on-resistance of 4Ω at VDDH=2.7V, a clock frequency exceeding 120MHz, and low on-capacitance of 9pF. It features ultra-low power consumption with a maximum standby current of 1µA.

Specialized ICS Feature Summary

• Supports SD, SDIO, and MMC specifications for 1-bit/4-bit host controllers
• Typical on-resistance of 4Ω and low on-capacitance of 9pF
• Clock path includes integrated pull-ups for high-impedance mode
• Maximum standby current of 1µA

Specialized ICS Applications

• Cell phones
• Digital cameras
• Media players

Specialized ICS Procurement Notes

Verify the package type matches the requirement, as the component is available in both MLP and UMLP formats. Confirm the specific suffix indicates the correct packaging configuration. Ensure the voltage range aligns with the target system's VDDH requirements between 1.65V and 3.6V.

Specialized ICS Selection Notes

Select this component when expanding a single host controller to drive dual SD/MMC peripherals. It is suitable for applications requiring bidirectional data and command transmission. Verify that the 4Ω on-resistance and 9pF capacitance meet the signal integrity requirements for the target data rates.

Specialized ICS Part Context

The FSSD06BQX belongs to the FSSD06 series of specialized ICs manufactured by Fairchild Semiconductor. It functions as a differential multiplexer with four channels, packaged in a 24-WFQFN exposed pad format. The device facilitates interface expansion in portable electronic devices requiring multiple storage or peripheral connections.

Specialized ICS Replacement Considerations

The FSSD06UMX is an alternative package variant within the same series. Verify pin compatibility and package dimensions before substitution.