PL2303HX

USB to Serial Bridge Controller,                                                                

Full compliance with the USB Specification v1.1
On-chip USB 1.1 transceiver and 5V3.3V regulator
Supports RS-232 serial interface with Programmable baud rate from 75 bps to 12 Mbps (Rev D)
Supports RS422/RS485 interface (Rev D)
Integrates on-chip Clock Generator (Rev D)
On-chip OTP (One Time Programming) ROM for startup device configurations like product string and serial number string (Rev D)
Extensive flow control mechanism like adjustable high/low watermark level, automatic hardware or software flow control, and inbound data buffer overflow detection
Configurable 256-byte outbound buffer and 256-byte inbound buffer; or 128-byte outbound buffer and 384-byte inbound buffer
Supports remote wake-up from MODEM input signals
Supports up to 8 GPIO pins (Rev D) - 4 General Purpose I/O pins & 4 Auxiliary General Purpose I/O
Package Type : SSOP28

​  data sheet