Congestion eliminated in handheld devices

The ISL54214 dual SP3T (single pole, triple throw) switch or 3:1 Mux combines low distortion audio and two USB 2.0 high speed data (480Mbit/s) signal switching paths in the same low voltage device. The switches enable use of a common mini USB or audio headphone connector in media players and other portable battery-operated products by allowing either two USB transceivers or one USB transceiver – plus a UART – to share pins with an audio codec. Meanwhile, the ISL54217 dual SP3T adds click and pop elimination circuitry to the switch. The audio switch cells in both devices can pass ±1V ground referenced audio signals with a total harmonic distortion and noise of less than 0.03% when driving 5mW into 32? headphone loads. In addition, the parts have a muting mode that provides high isolation between the codec and the headphone or amplifier load. The USB switch cells have an ON capacitance of 8pF, allowing USB signals to be passed with minimal edge and phase distortion. Dual USB 2.0 data paths allow multiple chips to share a high speed USB port. Both devices incorporate failsafe power-off protection to prevent USB lock-up or battery drain via USB ports in case of power failure. COM pins in each version can tolerate over voltages beyond the supply rails, meeting USB short circuit requirements with no additional components