FT232B - USB Interface Full Speed to Serial UART IC

The FT232B is the 2nd generation of FTDI's popular USB UART device and the FT232BL is a lead free version of the FT232BM. The FT232BQ provides the same functionality as the FT232BL in a QFN-32 lead free package.

FT232BL-REEL100 available to buy from our Webshop

The FT232Bx not only adds extra functionality to its predecessor and reduces external component count, but also maintains a high degree of pin compatibility with the original FT8U232A, making it easy to upgrade or cost-reduce existing designs. The FT232Bx makes light work of taking your new (or existing) designs from RS232 to USB as it runs standalone and therefore requires no processor overhead & no embedded USB stack.

As with all FTDI devices the hard work has been done for you, just design in the chip and choose the royalty-free drivers which best suits your application. In simple terms the FT232Bx can be dropped into replace an RS232 line driver IC in an existing design to provide a full USB Slave interface to your product. All the processing of the USB stack, USB transceiver and signal conditioning is carried out by the FT232Bx which requires minimal external circuitry, namely; EEPROM, crystal (or ceramic resonator) and a few resistors and capacitors.

The FT232Bx can interface to other UARTS & u-Processors in simple 2-wire (Tx, Rx) or full handshake configurations (Tx, Rx, CTS, RTS, DTR, DCD, RI) so your design just connects to a highly flexible UART interface at typical throughputs of 920K-1100Kbit/sec depending on your application.

The UART will auto-baud to most standard multiples from 300 baud upward and can be configured via the driver to run at non-standard rates for specific applications.

Key Features:

  • Single chip USB <=> asynchronous serial data transfer
  • Full handshaking & modem interface signals
  • Support for USB suspend/resume through SLEEP# and RI# pins
  • Integrated 3.3V regulator for USB IO
  • Integrated Power-On-Reset circuit
  • USB Bulk or Isochronous data transfer modes
  • 4.35V to 5.25V single supply operation
  • USB 1.1 and USB 2.0 compatible
  • USB VID, PID, serial number and product description strings in external EEPROM
  • EEPROM programmable on-board via USB
  • Compact 32-LD LQFP or QFN-32 package
  • Available as a Lead-free device (FT232BL and FT232BQ) compliant to EU directive 2002/95/EG RoHS

* FT232R and new generation FTDI X-Chip recommended for new designs.

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  • Single chip USB <=> asynchronous serial data transfer
  • Full handshaking & modem interface signals
  • UART interface supports 7/8 data bits, 1/2 stop bits and Odd/Even/Mark/Space/No Parity
  • Data transfer rate of 300 Baud => 3M Baud (TTL)
  • Data transfer rate of 300 Baud => 1M Baud (RS232)
  • Data transfer rate of 300 Baud => 3M Baud (RS422/RS485)
  • 384 Byte Rx buffer/128 Byte Tx buffer for high data throughput
  • Adjustable Rx buffer timeout
  • Fully assisted hardware or X-On/X-Off handshaking
  • Built-in support for event characters and line break condition
  • Auto transmit buffer control for RS485
  • Support for USB suspend/resume through SLEEP# and RI# pins
  • Support for high power USB bus powered devices through PWREN# pin
  • Integrated level converter on UART and control signals for interfacing to 5V and 3.3V logic
  • Integrated 3.3V regulator for USB IO
  • Integrated Power-On-Reset circuit
  • Integrated 6MHz - 48Mhz clock multiplier PLL
  • USB Bulk or Isochronous data transfer modes
  • 4.35V to 5.25V single supply operation
  • UHCI/OHCI/EHCI host controller compatible
  • USB 1.1 and USB 2.0 compatible
  • USB VID, PID, serial number and product description strings in external EEPROM
  • EEPROM programmable on-board via USB
  • Compact 32-LD LQFP or QFN-32 package
  • Available as a Lead-free device (FT232BL and FT232BQ) compliant to EU directive 2002/95/EG RoHS
  • USB <=> RS232 converters
  • USB <=> RS422 / RS485 converters
  • Upgrading RS232 legacy peripherals to USB
  • Cellular and cordless phone USB data transfer cables and interfaces
  • Interfacing MCU based designs to USB
  • USB audio and low bandwidth video data transfer
  • PDA <=> USB data transfer
  • USB smart card Readers
  • Set Top Box (S.T.B.) PC - USB interface
  • USB hardware modems
  • USB wireless modems
  • USB instrumentation
  • USB bar code readers
PART NUMBER PACKAGE TYPE PACK SIZE
FT232BL/TR 32-pin LQFP 1000 per reel
FT232BL-REEL500 32-pin LQFP 500 per reel, 7" reel
FT232BL-REEL250 32-pin LQFP 250 per reel, 7" reel
FT232BL-REEL100 32-pin LQFP 100 per reel, 7" reel
FT232BL-TRAY 32-pin LQFP 250 per tray
FT232BQ-REEL 32-pin QFN 1000 per reel
FT232BQ-TRAY 32-pin QFN 250 per tray

* FT232R or new generation FTDI X-Chip IC's recommended for new designs.

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Last updated: 14 March 2014