March 2012

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSSD07 Rev. 1.0.2

FSSD07

1-Bit / 4-Bit SD/SDIO and MMC Dual-Host Multiplexer

Features

(SDIO), and Multimedia Card (MMC) Specifications

to 3.6V) Communicating with

High-Voltage (2.7-3.6V) and Dual-Voltage Cards

(1.65-1.95V, 2.7-3.6V)

-

Applications

Notebook Computer

Related Resources

Description

The FSSD07 is a 2:1 multiplexer that allows dual Secure

Digital (SD), Secure Digital I/O (SDIO), and Multimedia

Card (MMC) host controllers to share a common

peripheral. The host controllers can be equal to, greater

than, or less than peripheral card supply with minimal

power consumption. This configuration enables dual

host CMD, CLK, and D[3:0] signals to be multiplexed to

a common peripheral.

The architecture includes the necessary bi-directional

data and command transfer capability for single high-

voltage cards or dual-voltage supply cards. The clock

path is a uni-directional buffer.

Typical applications involve switching in portables and

consumer applications: cell phones, digital cameras,

home theater monitors, set-top boxes, and notebooks.

Figure 1. Analog Symbol Diagram

Ordering Information

Part

Number

Top

Mark

Operating

Temperature Range

Package Description

Packing

Method

FSSD07BQX

FSSD07

-40°C to +85°C

24-Lead Molded Leadless Package (MLP), JEDEC

MO-220, 3.5 x 4.5mm

Tape &

Reel

FSSD07UMX

JK

-40°C to +85°C

24-Lead Ultra-thin Molded Leadless Package

(UMLP), 0.4mm pitch

Tape &

Reel