The XR28V382 is packaged in a 5 x 5 mm 32 pin QFN and includes two UART channels, while the XR28V384 has four UART channels in a 7 x 7 mm 48 pin TQFP. Exar’s dual and quad LPC UARTs, compared to 128 pin super I/O devices, offer the same or more serial channels in a significantly smaller footprint, offering as much as and eight-fold reduction in board space.
The parts interface directly with the system BIOS so there is no need to install a driver, and they are inherently compatible with multiple operating systems because the device is configured before the OS loads. Both parts include Exar’s automatic half duplex control for RS-485 networks. These parts feature 128 Byte transmit and receive FIFOs, are rated for the industrial temperature range, and operate at 3.3V. Each UART channel supports serial data rates up to 3 Mbps.
Prices for XR28V382 and XR28V384 are $2.40 and $3.50 (1000) respectively.