Features: 

 Full Compliant with USB Specification v2.0 (Full-Speed)

 USB-IF Logo Compliant with TID 40001308

 UHCI/OHCI (USB1.1), EHCI (USB 2.0), xHCI (USB 3.0) Host Controller Compatible

 On Chip USB 1.1 Transceiver, 5V3.3V regulator, and 12 MHz crystal oscillator

 Single Chip USB to RS232 Serial UART Interface:

o Full-duplex transmitter and receiver (TXD and RXD)

o Six MODEM control pins (RTS, CTS, DTR, DSR, DCD, and RI)

o 5, 6, 7 or 8 data bits o Odd, Even, Mark, Space, or None parity mode

o One, one and a half, or two stop bits

o Parity error, frame error, and serial break detection

o Programmable baud rate from 75 bps to 12 Mbps

o External RS232 driver power down control

o Independent power source for serial interface

o Works with existing PC COM Port software applications

 Supports RS422/RS485 serial interface (TXD, DTR_N, and RTS_N pins should be externally pulled-up to 5V when 5V interface is applied). 

Prolific USB to Serial Product Comparison: