FTx232H Dual/Quad Hi-Speed USB ICs FTDI FTx232H Dual/Quad Hi-Speed USB ICs are 5th generation USB devices with a USB 2.0 high speed (480Mb/s) to UART/MPSSE or UART/FIFO ICs. The FTDI FTx232H-56Q are single-chip USB to dual or quad serial ports with various configurations. The entire USB protocol is handled on the chip with no USB-specific firmware programming required.