Features: 1) USB rev. 1.1 and 2.0 compliant 2) Supports RS-232 serial interface(DV9pin) 3) Over 1Mbps data transfer rate 4)Supports plug and play and hot swap function 5)Supports automatic handshake mode 6)Provides dual buffer for upstream and downstream data transfer 7)On chip USB transceiver 8)On chip crystal oscillator running at 12MHz 9)Power supply voltage: -0.3 to 6.0V