FREMONT, USA: Exar Corp. announced a new family of USB to serial bridge devices for industrial applications. The XR21B142x family provides a convenient and straightforward way to interface with RS-232 or RS-485 serial networks through USB using a minimum of components and PCB space.
The XR21B1420, XR21B1422, and XR21B1424 provide 1, 2, and 4 UART channels respectively. The XR21B1421 provides a single channel UART and uses the native operating system HID (Human Interface Device) driver.
The XR21B142x devices are fully compliant to the USB 2.0 (Full-Speed) specification with 12Mbps USB data transfer rate, and deliver significantly higher data throughput compared to competing devices, especially when multiple channels are operating simultaneously. Large 512-byte transmit (TX) and receive (RX) FIFOs enable a maximum data throughput of 9Mbps across up to four UART channels.