FT234XD - Full Speed USB to Basic UART

USB2.0 Full Speed IC at just 3mm x 3mm with RXD, TXD RTS and CTS signalling.

This USB2.0 Full Speed  IC offers a compact bridge to basic UART interfaces. The device is a UART, capable of operating up to 3MBaud, with low power consumption (8mA). The FT234XD includes the complete FT-X series feature set and enables USB to be added into a system design quickly and easily over a UART interface.

Key features:

  • Single chip USB to asynchronous serial data transfer interface.
  • Entire USB protocol handled on the chip.
  • No USB specific firmware programming required.
  • Fully integrated 2048 byte EEPROM for storing device descriptors and CBUS I/O configuration.
  • Fully integrated clock generation with no external crystal required plus optional clock output selection enabling a glue-less interface to external MCU or FPGA.
  • Data transfer rates from 300 baud to 3 Mbaud.512 byte receive buffer and 512 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput.
  • FTDI's royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers
  • UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no paritySynchronous and asynchronous bit bang interface options with RD# and WR# strobes.
  • May be used by mobile devices to detect the presence of a charger on the USB port to enable higher current / faster charging of batteries.Device supplied pre-programmed with unique USB serial number.
  • Supports bus powered, self powered and high-power bus powered USB configurations.
  • True 3.3V CMOS drive output and TTL input.(operates down to 1V8 with external pull ups and is also 5V tolerant)Configurable I/O pin output drive strength.
  • Integrated power-on-reset circuit.UART signal inversion option.Internal 3.3V/1.8V LDO regulatorsLow operating current of 8mA (typical) and USB suspend current of 125uA (typical) current.
  • Low USB bandwidth consumption.UHCI/OHCI/EHCI host controller compatible.USB 2.0 Full Speed compatible.Extended operating temperature range: -40°C to 85°CAvailable in compact Pb-free 12 Pin DFN package (RoHS compliant).


  • USB 2.0 Full Speed compatible
  • High performance USB device controller with integrated SIE, endpoint buffer, transceiver and voltage regulators
  • Fully integrated clock generation with no external crystal required
  • Supports 8-bit parallel interface to external microcontroller
  • Supports DMA operation
  • Supports up to 8 bi-directional endpoints with total 2K bytes endpoint buffer
  • Max packet size is 504 bytes for isochronous endpoint and 64 bytes for control/bulk/ interrupt endpoint
  • Double buffer scheme for any endpoint increases data transfer throughput
  • Multiple interrupt modes to facilitate both bulk and isochronous transfers
  • USB Battery Charger detection allowing optimized charging profile
  • Dedicated clock output pin with programmable clock frequency (4 - 24 MHz)
  • 30 kHz output clock provided during suspend
  • Integrated DP pull-up resistor for USB connection
  • USB connection indicator that toggles with USB transmit and receive activities
  • Supports bus powered or self powered application
  • VCC power supply operation at 3.3V or 5V
  • Internal 1.8V and 3.3V LDO regulators
  • VCC IO level range from 1.8V to 3.3V
  • Integrated power-on-reset circuit
  • UHCI/OHCI/EHCI host controller compatible
  • -40°C to 85°C extended operating temperature range
  • Available in Pb-free TSSOP-28 and QFN-28 packages (RoHS compliant)
  • 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 and WritersSet Top Box PC - USB interface
  • USB Digital Camera Interface
  • USB Hardware ModemsUSB Wireless Modems
  • USB Bar Code ReadersDedicated Charger Port (DCP) detection enabling battery charging at higher current for faster charge times.
Part Number Description Pack Size
FT234XD-R 12-pin DFN Reel of 5000
FT234XD-T
12-pin DFN
Tray of 490

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Last updated: 8 August 2013