March 2012

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSSD06 • Rev. 1.0.5

FSSD06 — SD/SDIO and MMC Two-Port Multiplexer

Features

(SDIO), and Multimedia Card (MMC) Specifications

3.6V) Communicating with High-Voltage (2.7-3.6V)

and Dual-Voltage Cards (1.65-1.95V, 2.7-3.6V)

-

Applications

Description

The FSSD06 is a two-port multiplexer that allows Secure

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

Card (MMC) host controllers to be expanded out to

multiple cards or peripherals. This configuration enables

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

dual-card peripherals. It is optimized for 1-bit / 4-bit SD /

MMC applications.

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 for the FSSD06 is a uni-directional buffer with an

integrated pull-up for high-impedance mode.

Typical applications involve switching in portables and

consumer applications: cell phones, digital cameras,

home theater monitors, portable GPS units, and printers.

Analog Symbol Diagram

GND

1CLK

2CLK

DAT[0:3], CMD

CLK

Control

/OE

S

V

DDC1

R

PU

1DAT[0:3], 1CMD

2DAT[0:3], 2CMD

V

DD C2

R

PU

5

5

5

VDDC1

VDDC2

VDDH

Figure 1.

Analog Symbol Diagram

Ordering Information

Part Number

Operating

Temperature Range

Package Description

Packing

Method

FSSD06BQX

-40°C to +85°C

24-Lead Molded Leadless Package (MLP), JEDEC MO-

220, 3.5 x 4.5mm

Tape & Reel

FSSD06UMX

-40°C to +85°C

24-Lead Ultrathin Molded Leadless Package (UMLP)

Tape & Reel