XR16V794 16C550 RS-485 XR16L784 RS-232/RS-422/RS-485 RS485 FLY1206 XR16V794IV

High Performance 2.25V to 3.63V Quad UART with Fractional Baud Rate Generator Ideal for High Speed Data Transmission at Low

XR16V794 XR16V794 High Performance 2.25V to 3.63V Quad UART with Fractional Baud Rate Generator Ideal for High Speed Data Transmission at Low Voltages T he XR16V794 XR16V794¹ (V794) is a 2.25V to 3.63V quad Universal Asynchronous Receiver and Transmitter (UART) with 5V tolerant serial (modem) inputs. The highly integrated device is designed for high bandwidth requirement in communication systems. The global interrupt source register provides a complete interrupt status indication for all 4 channels which speed up interrupt parsing. Each UART has its own 16C550 16C550 compatible set of configuration registers, TX and RX FIFOs of 64 bytes, fully programmable TX and RX FIFO trigger levels, TX and RX FIFO level counters, automatic RTS/CTS or DTR/DSR hardware flow control with programmable hysteresis, automatic software (Xon/Xoff) flow control, RS-485 RS-485 half-duplex direction control with programmable turn-around delay, Intel or Motorola bus interface and sleep mode with a wake-up indicator. The XR16V794 XR16V794 has several features that greatly simplify hardware and software design. The fifth generation flat register set reduces software development efforts. The V794 also has a global interrupt source register, which provides for faster interrupt servicing and improves overall efficiency. The register monitors which UART channel has an interrupt service request, and reports whether the UART channel transmitter or receiver requires servicing. The V794 enables the transfer of more data bytes in each interrupt service thus reducing the CPU bandwidth requirements. The RTS/CTS or DTR/DSR automatic hardware and software flow control feature maximizes data throughput for higher system performance. The XR16V794 XR16V794 is hardware and software compatible with Exar's existing XR16L784 XR16L784. ¹Covered by U.S. Patent #5,649,122 and #5,949,787 Major Features · 2.25V to 3.63V with 5V Tolerant Serial Inputs · Single Interrupt Output for all 4 UART Channels · A Global Interrupt Source Register for all 4 UART Channels · 5G "Flat" UART Registers for easier programming · Simultaneous Initialization of all UART channels · A General Purpose Commanddriven 16-bit Timer/counter · Sleep Mode with Wake-up Indication · Highly Integrated Device for Space Saving · Up to 8 Mbps Serial Data Rate · Pin compatible to XR16L784 XR16L784. Same 64-pin LQFP Package (10x10x1.4 mm) XR16V794 XR16V794 High Performance 2.25V to 3.63V Quad UART with Fractional Baud Rate Generator XR16V794 XR16V794 Block Diagram Features · Each UART channel is independently controlled with: · 16C550 16C550 Compatible 5G Register Set · 64-byte Transmit and Receive FIFOs · Fractional Baud Rate Generator · Transmit and Receive FIFO Level Counters · Programmable TX and RX FIFO Trigger Level Applications · Remote Access Servers · Ethernet Network to Serial Ports · Network Management · Factory Automation and Process Control · Point-of-Sale Systems · Multi-port RS-232/RS-422/RS-485 RS-232/RS-422/RS-485 Cards · Automatic RTS/CTS or DTR/DSR Flow Control · Automatic Xon/Xoff Software Flow Control · RS485 RS485 Half-duplex Control Output with Selectable Turn-around Delay · Infrared (IrDA 1.0) Data Encoder/Decoder · Programmable Data Rate with Prescaler Ordering Information Product No. · Pb-Free, RoHS Compliant Versions Offered FLY1206 FLY1206_XR16V794 XR16V794 ©2006 Exar Corporation XR16V794IV XR16V794IV Package Operating Temp. Range 64-Lead LQFP -40°C to +85°C Exar Corporation · 48720 Kato Road · Fremont, CA 94538 · 510.668.7000 · fax 510.668.7001 · www.exar.com