FT221X - Single chip USB to 8-Bit SPI/FT1248 interface IC

This USB2.0 Full Speed  IC offers a compact bridge to 8-Bit SPI/FT1248 interfaces, with low power consumption (8mA), and  includes the complete FT-X series feature set enabling USB to be added into a system design quickly and easily over an FT1248 interface.

Key features:

  • FT1248 serial parallel interface in 1, 2, 4 or 8 bit wide mode.
  • Similar to an SPI slave in 1-bit mode
  • Entire USB protocol handled on the chip. No USB specific firmware programming required.
  • Fully integrated 2048 byte MTP Memory for storing device descriptors and CBUS I/O configuration.
  • Data transfer rates to 500 kByte/s
  • FTDI's royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases.
  • Configurable CBUS I/O pin.
  • Device supplied pre-programmed with unique USB serial number.
  • Supports bus powered, self powered and high-power bus powered USB configurations.
  • I/O levels from 1.8V to 3.3V. (5V tolerant inputs).
  • Battery Charger Detection. 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.
  • Low 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.
  • 20 Pin SSOP and QFN packages (both RoHS compliant).


  • FT1248 serial parallel interface in 1, 2, 4 or 8 bit wide mode.
  • Similar to an SPI slave in 1 bit mode
  • Entire USB protocol handled on the chip. No USB specific firmware programming required.
  • Fully integrated 2048 byte MTP Memory 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 to 500 kByte/s
  • 512 byte receive buffer and 512 byte transmit buffer utilising buffer smoothing technology to allow for high data throughput.
  • Configurable CBUS I/O pin.
  • Device supplied pre-programmed with unique USB serial number.
  • Supports bus powered, self powered and high-power bus powered USB configurations.
  • Integrated +3.3V level converter for USB I/O.
  • True 3.3V CMOS drive output and TTL input. (operates down to 1V8 with external pull-ups)
  • I/O levels from 1.8V to 3.3V. (5V tolerant inputs).
  • Configurable I/O pin output drive strength.
  • Battery Charger Detection. 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.
  • Integrated power-on-reset circuit.
  • Internal 3.3V/1.8V LDO regulators
  • Low 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°C
  • 20 Pin SSOP and QFN packages (both RoHS compliant).
  • USB to SPI interface in 1-bit mode
  • Upgrading Legacy Peripherals to USB
  • Utilising USB to add system modularity
  • Incorporate USB interface to enable PC transfers for development system communication
  • Interfacing MCU/PLD/FPGA based designs to add USB connectivity
  • USB Industrial Control
  • USB MP3 Player Interface
  • USB FLASH Card Reader and Writers
  • Set Top Box PC - USB interface
  • USB Digital Camera Interface
  • USB dongle implementations for Software/Hardware Encryption and Wireless Modules
  • Detect USB dedicated charging ports, to allow for high current battery charging in portable devices.
Part Number Description Pack Size
FT221XS-R 20-pin SSOP single chip USB to 8-Bit SPI/FT1248 IC, Revision D Reel of 3000
FT221XS-U 20-pin SSOP single chip USB to 8-Bit SPI/FT1248 IC, Revision D
Tube of 58
FT221XQ-R 20-pin QFN single chip USB to 8-Bit SPI/FT1248 IC, Revision D Reel of 5000
FT221XQ-T 20-pin QFN single chip USB to 8-Bit SPI/FT1248 IC, Revision D Tray of 490
Development Modules
UMFT221XA-01 USB to 8-bit SPI/FT1248 evaluation module. Pin length: 4.6mm. Each
UMFT221XA-02 USB to 4-bit SPI/FT1248 evaluation module. Pin length: 3.6mm (when available). Each

Development Module

The UMFT221XA Development Module is based on the FT221XQ (16-pin QFN) chip and offers access to all the pins of the FT221X.

UMFT221XA-01-200px

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Last updated: 4 October 2015