Fangrui Product Details Ch382 Is A Dual Serial Port And Printing Port Chip For Pci-express Bus,include 2 Asynchronous Serial Port Compatible For 16c550/16c750 And An Epp/ecp Enhanced Bidirectional Parallel Port.asynchronous Serial Port Provides An 256-byte Buffer For Sending And Receiving,supports A Communication Baud Rate Of 8mbps,can Be Used For Rs232 Serial Port Expansion Of The Pci-e Bus,pci-e High-speed Serial Port With Auto Hardware Rate Control,serial Port Networking,and Rs485 Communication,etc The Same Chip Can Be Configured As Dual Serial Ports, Single Parallel Port/printing Port, Or Dual Serial Ports Plus Parallel Port/printing Port Of The Pci-e Bus. Provides A Two-wire Serial Host Interface, Which Can Be Connected To A Serial Eeprom Device Similar To 24c0x For Storing Non-volatile Data. The Device Identification ( Id, Device Id, Class Code, Etc.) Of The Pcie Board Can Be Set In The Eeprom Device. 3.3v Power Supply Voltage, Main I/o Pins Support 5v Withstand Voltage, And Support Serial Port Low-power Sleep Mode. Desc