Key Technical Specifications

• Function: 6-Channel SPDT (Single-Pole Double-Throw) Multiplexer/Demultiplexer.[4]
• Voltage Range: 1.1V to 3.6V (Supports independent rails for host and both peripherals).[4][6][7][8]
• Interface Support: SD, SDIO, and MMC (MultiMediaCard).[4]
• Operating Frequency: Up to 60 MHz.[4]
• Supply Rails:
  • VCCA: Host-side supply (1.1V to 3.6V).
  • VCCB0 & VCCB1: Peripheral-side supplies (1.1V to 3.6V).
• Package: 24-pin WQFN (4mm x 4mm).[2][9]
• Operating Temperature: -40°C to +85°C (Industrial Grade).
• ESD Protection:
  • A-Port: 2 kV Human Body Model (HBM).
  • B-Ports: ±8 kV IEC 61000-4-2 Contact Discharge.[1][2][7][8]

Core Functionality

The chip acts as a "traffic controller" for data signals (Clock, Command, and 4 Data lines).

1. Expansion: It splits one SDIO port into two (Port B0 and Port B1).
2. Selection: A single SEL pin determines which peripheral is active.[7][8]

• SEL = Low: Port B0 is connected to the Host.
• SEL = High: Port B1 is connected to the Host.