FXL3SD206 is a voltage translator with multiplexing and de-multiplexing functions for SDIO devices. It is designed for voltage translation over a wide range of input and output levels, from 1.65V to 3.6V.

The multiplexing/de-multiplexing function of this device allows expansion of a host SDIO interface to two SDIO peripheral devices. When selected, each SDIO peripheral can communicate with the host through the same host interface. An alternative application allows two host devices to interface with a single SDIO peripheral.

Port A is intended to connect to a host device and the voltage level tracks the V_DDA. Ports B and C are intended to connect to peripheral devices. Peripheral I/O voltage levels track either V_{DD_HI} or V_{DD_LO} as determined by the VDD_SEL pin. During normal operation, V_{DD_HI} must be greater than or equal to V_{DD_LO}. The CH_SEL, VDD_SEL, and OE pins are referenced to V_{DD_CON}. Channel communication from either Port A to Port B or Port A to Port C is controlled by the CH_SEL pin.

The selected channel remains in 3-state until the V_DD of each side reaches an active level and the OE pin reaches a valid high. Internal power-down circuitry places the selected channel of the device in 3-state if either side V_DD removed.

The direction of data is controlled automatically by the device. No direction control pin is required. The device senses input signals on any port automatically and transfers the data to the corresponding output.

• Bi-Directional Interface between Two Levels: 1.65 to 3.6V
• Fully Configurable: Inputs and Outputs Track V_DD
• Flexible and Programmable V_DD of B and C Ports
• Non-Preferential Power-up; either V_DD Can Power Up First
• Output Remains in 3-State until Active V_DD Level is Reached
• Output Switches to 3-state if either V_DD is at GND
• Power-off Protection
• Bus-Hold on Data Input Eliminates the Need for SDIO Pull-up Resistors
• 2:1 MUX/DEMUX of SDIO Devices in 24-Terminal Micro-MLP Package (2.5mm x 3.4mm)
• Direction Control is Automatic
• Power Switching Time (V_{DD_HI} to V_{DD_LO} or Reverse) is Less than 1.7µs
• 60Mbps Throughput
• ESD Protection Exceeds:
• 12KV HBM (A, B, and C port I/O to GND) (per JESD22-A114)
• 1KV CDM (per ESD STM5.3)

• SDIO Devices
• Cell Phone, PDA, Digital Camera, Portable GPS