FSSD07: 1-Bit / 4 Bit SD/SDIO and MMC Dual-Host Multiplexer

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.

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 (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