FT232RL USB to Serial UART Interface IC – SSOP-28 USB 2.0 Full-Speed Converter

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The FT232RL USB to UART Interface IC is a single-channel USB-to-serial UART converter designed for connecting microcontrollers, embedded systems, and other serial devices to a USB interface. It integrates the USB protocol engine, clock circuitry, USB resistors, and EEPROM, helping simplify USB-to-UART circuit designs.

The IC supports USB 2.0 Full-Speed communication and UART data rates up to 3 Mbaud. Its compact 28-pin SSOP package makes it suitable for space-constrained designs. It also supports asynchronous and synchronous bit-bang modes and includes an integrated EEPROM for device configuration.

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Key Features

• USB to Serial UART interface

• USB 2.0 Full-Speed compatible

• UART data rates up to 3 MB

• Compact SSOP-28 package

• Integrated USB protocol engine

• Integrated EEPROM for configuration

• Built-in oscillator; no external crystal required

• Supports asynchronous and synchronous bit-bang modes

• Integrated USB resistors and power-on reset

• Low operating and USB suspend current

• Supports 3.3V to 5.25V single-supply operation

• Suitable for TTL-level and RS422/RS485 interface applications with appropriate external circuitry

• Extended operating temperature range of -40°C to +85°C
  

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Technical Specifications

Specification	Details
IC Part Number	FT232RL
Interface Type	USB to Serial UART
USB Standard	USB 2.0 Full Speed
USB Speed	12 Mbps Full Speed
UART Data Rate	300 baud to 3 Mbaud
Supply Voltage	3.3V to 5.25V
Package	SSOP-28
Channels	1
UART Interface	Full UART with modem control
EEPROM	Integrated 1024-bit EEPROM
Oscillator	Integrated
Bit-Bang Mode	Asynchronous & Synchronous
Operating Temperature	-40°C to +85°C
USB Transfer Mode	Bulk
USB Host	No
USB Class	Vendor
Virtual COM Port	Supported

Note: The 12 Mbps figure refers to USB Full-Speed bus speed, while the FT232RL UART data rate is up to 3 MB.

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Pin Configuration

Pin	Name	Function
1	GND	Ground
2	3V3OUT	3.3V output
3	VCC	Supply voltage input
4	USBDP	USB D+
5	USBDM	USB D-
6	SLEEP	Sleep indicator output
7	RXD	UART receive data
8	TXD	UART transmit data
9	RTS	Request to Send
10	CTS	Clear to Send
11	DTR	Data Terminal Ready
12	DSR	Data Set Ready
13	DCD	Data Carrier Detect
14	RI	Ring Indicator

Refer to the manufacturer's datasheet for the complete 28-pin configuration and electrical characteristics.

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Applications

• USB-to-serial adapters

• Microcontroller USB interfaces

• USB-to-RS232 converter designs

• USB-to-RS422/RS485 converter designs

• Industrial control systems

• USB instrumentation

• Data logging equipment

• Embedded development systems

• Consumer electronics

• MCU, PLD and FPGA USB interfaces

• USB hardware interfaces and peripherals

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Precautions

• Verify the IC orientation and pin numbering before soldering.

• Follow the recommended supply voltage range.

• Use proper ESD protection when handling the IC.

• Avoid static discharge directly to the IC pins.

• Do not exceed the maximum electrical ratings.

• Use appropriate external transceivers when implementing RS232, RS422 or RS485 interfaces.

• Ensure correct USB D+ and D− connections in the circuit.

• Use proper PCB layout practices for USB signals.

• This is an SMD SSOP-28 IC and requires suitable soldering equipment and PCB pads.

• Product images are for illustration only, and the actual IC marking or packaging may vary.

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Package Includes

• 1 × FT232RL USB to Serial UART Interface IC – SSOP-28