Universal Asynchronous Receiver and Transmitter (UART) chip manufactured by Exar. It serves as a serial communication interface between a CPU and external devices like modems or printers - Package Type: 40-pin Plastic Dual In-line Package (PDIP). Compatibility: Pin-to-pin and functionally compatible with the industry-standard 16450 UART. Operating Speed: Supports baud rates from 50 bps to 1.5 Mbps. Voltage Range: Operates between 2.97V and 5.5V. Operating Temperature: Commercial grade ( to ). Data Features: Programmable word lengths (5, 6, 7, or 8 bits). Complete MODEM control capability. Internal loop-back capability for diagnostic testing