The TTL-232R-3V3-PCB is a USB to Serial (TTL level) converter PCB  which allows for a simple way to connect TTL interface devices to USB.  This version of FTDI's USB to TTL serial adapter has it's I/O pins configured to operate at 3.3V levels.

The TTL-232R-3V3-PCB uses a FT232RQ device and is the same as that which is housed inside the USB 'A' connector of the TTL-232R-3V3.   The PCB provides access to the Transmit (Tx), Receive (Rx), RTS#, and CTS#.  These lines all operate at 3.3V levels.  Also brought out on the header are VCC (5V) and GND.

The TTL-232R-3V3-PCB is fully RoHS compliant and is supplied loose packed in an anti-static bag.  It is FCC and CE approved.
 

Several variants of the TTL-232R-3V3-PCB are available:

• TTL-232R (TTL-232R with 5V IOs)

• TTL-232R-3V3 (TTL-232R with 3.3V IOs)

• TTL-232R-AJ (Audio Jack connector, 5V IOs)

• TTL-232R-3V3-AJ (Audio Jack connector, 3.3V IOs)

• TTL-232R-PCB (Populated PCB from the TTL-232R-3V3 USB connector, 5V IOs)

• TTL-232R-WE (No connector at serial end, 5V IOs)

• TTL-232R-3V3-WE (No connector at serial end, 3.3V IOs)

Features include:

• TTL-232R-3V3-PCB converter PCB provides a USB to TTL Serial interface.

• On-board FT232RQ provides single chip USB to asynchronous serial data transfer interface.

• Entire USB protocol handled on the FT232RQ chip - No USB-specific firmware programming required.

• Connect a microcontroller/PLD/FPGA directly to a PC USB port.

• Fully compatible with existing legacy COM port software.

• FTDI’s royalty-free VCP drivers allow for communication as a standard COM port and D2XX ‘direct’ drivers provide DLL application programming interface.

• Data transfer rates from 300 Baud to 3 Mega Baud at TTL levels.

• UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd/even/mark/space/ no parity.

• Fully assisted hardware (RTS#/CTS#) or X-On/X-Off software handshaking.

• 3.3V CMOS drive outputs and 5V safe TTL inputs makes the TTL-232R easy to interface to 3.3V MCUs.

• Support for FT232R FTDIChip-ID™ feature.

• Cable supply voltage comes from USB - no external supply required.

• 5V output allow devices to be powered from the USB port.

• PCB allows access to Tx, Rx, RTS#, CTS#, VCC, and GND.

• Low USB bandwidth consumption.

• HCI/OHCI/EHCI host controller compatible.

• USB 2.0 Full Speed compatible.

• -40°C to +85°C operating temperature range.

• Connect to a PC via USB ‘A’ plug on the PCB.

• A 5V TTL I/O version is also available (TTL-232R-PCB).

• Custom versions also available (subject to MOQ).

• TTL-232R-3V3-PCB Datasheet

• VCP Drivers
• D2XX Drivers
• Schematic
• TTL-232R-3V3-PCB Pad Designations

The TTL-232R3V3 is competitively priced at $20 each in small quantities.  It is available on-line from the FTDI Chip Shop, directly from FTDI or through the FTDI worldwide sales network.