ElectronicsThe CH331A with USB ICs 3.3V, 5V SSOP-20_208mil RoHS manufactured by Qin Heng Electronics is a single-chip USB communications controller. It supports two USB full-speed ports with corresponding data FIFO, assists with the management of data exchange and supports the NAK, handshake, in-packet CRC error detection, and timeout detection functions. It also integrates USB 1.1 full-speed physical layer transceivers, USB signal timing control unit, USB core unit, and OHCI host controller unit. Its integration of hardware and firm IP cores makes it ideal for various USB applications such as USB hub, digital camera, card-reader, printer serial interface, and USB device. This product is RoHS compliant and its package is SSOP-20_208mil.