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FSSD07 — 1-Bit / 4-Bit SD/SDIO and MMC Dual-Host Multiplexer
March 2012
FSSD07
1-Bit / 4-Bit SD/SDIO and MMC Dual-Host Multiplexer
Features
On Resistance: 5Ω Typical, V
DDC
=2.7V
f
toggle
: >75MHz
Low On Capacitance: 6pF Typical
Low Power Consumption: 2µA Maximum
Supports Secure Digital (SD), Secure Digital I/O
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.
(SDIO), and Multimedia Card (MMC) Specifications
Supports 1-Bit / 4-Bit Host Controllers (V
DDH1/H2
=1.65V
to 3.6V) Communicating with
High-Voltage (2.7-3.6V) and Dual-Voltage Cards
(1.65-1.95V, 2.7-3.6V)
-
V
DDC
=1.65 to 3.6V, V
DDH1/H2
=1.65 to 3.6V
24-Lead MLP and UMLP Packages
Applications
Cell Phone, PDA, Digital Camera, Portable GPS, and
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