Features
Hardware Features
• Single chip USB to asynchronous serial data transfer interface.
• Entire USB protocol handled on the chip - No USB-specific firmware programming required.
• UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity.
• Fully assisted hardware or X-On / X-Off software handshaking.
• Data transfer rates from 300 baud to 3 Megabaud (RS422 / RS485 and at TTL levels) and 300 baud to 1 Megabaud (RS232).
• 256 byte receive buffer and 128 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput.
• FTDI’s royalty-free VCP and D2XX drivers eliminate the requirement for USB driver development in most cases.
• In-built support for event characters and line break condition.
• New USB FTDIChip-ID™ feature.
• New configurable CBUS I/O pins.
• Auto transmit buffer control for RS485 applications.
• Transmit and receive LED drive signals.
• New 48MHz, 24MHz,12MHz, and 6MHz clock output signal Options for driving external MCU or FPGA.
• FIFO receive and transmit buffers for high data throughput.
• Adjustable receive buffer timeout.
• Synchronous and asynchronous bit bang mode interface options with RD# and WR# strobes.
• New CBUS bit bang mode option.
• Integrated 1024 Bit internal EEPROM for storing USB VID, PID, serial number and product description strings, and CBUS I/O configuration.
• Device supplied preprogrammed with unique USB serial number.
• Support for USB suspend and resume.
• Support for bus powered, self powered, and high power bus powered USB configurations.
• Integrated 3.3V level converter for USB I/O .
• Integrated level converter on UART and CBUS for interfacing to 5V - 1.8V Logic.
• True 5V / 3.3V / 2.8V / 1.8V CMOS drive output and TTL input.
• High I/O pin output drive option.
• Integrated USB resistors.
• Integrated power-on-reset circuit.
• Fully integrated clock - no external crystal, oscillator, or resonator required.
• Fully integrated AVCC supply filtering - No separate AVCC pin and no external R-C filter required.
• UART signal inversion option.
• USB bulk transfer mode.
• 3.3V to 5.25V Single Supply Operation.
• Low operating and USB suspend current.
• Low USB bandwidth consumption.
• UHCI / OHCI / EHCI host controller compatible
• USB 2.0 Full Speed compatible.
• -40°C to 85°C extended operating temperature range.
• Available in compact Pb-free 28 Pin SSOP and QFN-32 packages (both RoHS compliant).

Typical Applications
• USB to RS232 / RS422 / RS485 Converters
• Upgrading Legacy Peripherals to USB
• Cellular and Cordless Phone USB data transfer cables and interfaces
• Interfacing MCU / PLD / FPGA based designs to USB
• USB Audio and Low Bandwidth Video data transfer
• PDA to USB data transfer
• USB Smart Card Readers
• USB Instrumentation
• USB Industrial Control
• USB MP3 Player Interface
• USB FLASH Card Reader / Writers
• Set Top Box PC - USB interface
• USB Digital Camera Interface
• USB Hardware Modems
• USB Wireless Modems
• USB Bar Code Readers
• USB Software / Hardware Encryption Dongles