FTDI provides USB devices as per the USB 2.0 specification ranging from High speed (480 Mb/s), Full speed (12 Mb/s) and Low speed (1.2 Mb/s) devices. The FT232R is a USB to UART integrated circuit that provides a serial port with full modem handshake signals as well as four General Purpose Input/Output (GPIO) pins. It works with the FTDI VCP and D2XX device drivers. It has an internal clock generation module, internal USB termination, and on board EEPROM to store custom device descriptors. The device operates at up to 3 Mb/s throughput at TTL/CMOS logic levels. For an RS232 implementation, an external level shifter is required which limits the rate to 1 Mb/s. The FT232R is available in a 28-SSOP and 32-QFN package. The part features a 3.3V to 5.25V single supply voltage requirement and can operate at I/O logic levels as low as 1.8V. The USB VID, PID, serial number, and product description strings are stored in the internal EEPROM. It has a fully integrated clock, which means no external crystal, oscillator, or resonator is required. Apart from all these features, the device has the capability to carry out bit bang operation with the D2XX drivers. Clock outputs are also available to clock external logic.