FSSD06: SD/SDIO and MMC 2-Port Multiplexer

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.

Features

• On Resistance Typically 4Ω, V_DDH=2.7V
• f_toggle: > 120MHz
• Low On Capacitance: 9pF Typical
• Low Power Consumption: 1µA Maximum
• Conforms to Secure Digital (SD), Secure Digital I/O (SDIO), and Multimedia Card (MMC) Specifications
• Supports 1-Bit / 4-Bit Host Controllers (V_DDH=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)
  • VDDH=1.65 to 3.6V, VDDC1/C2=VDDH to 3.6V
• V_DDH=1.65 to 3.6V, V_DDC1/C2=V_DDH to 3.6V
• 24-Lead MLP (3.5 x 4.5mm) and UMLP Packages