XR16L2550 Datasheet | Exar

DESCRIPTION The XR16L25501 (L2550) is a dual universal asynchronous receiver and transmitter (UART). The XR16L2550 is an improved version of the ST16C2550 UART with lower operating voltages and 5 volt tolerant inputs. The L2550 provides enhanced UART functions with 16 byte FIFOs, a modem control interface and data rates up to 4 Mbps. Onboard status registers provide the user with error indications and operational status. System interrupts and modem control features may be tailored by external software to meet specific user requirements. Independent programmable baud rate generators are provided to select transmit and receive clock rates up to 3.125 Mbps. The Baud Rate Generator can be configured for either crystal or external clock input. An internal loopback capability allows onboard diagnostics. The L2550 is available in a 44-pin PLCC, 48-pin TQFP and 32-pin QFN packages. The L2550 is fabricated in an advanced CMOS process. NOTE: 1 Covered by U.S. Patent #5,649,122. APPLICATIONS - Portable Appliances - Medical Monitors - Base Stations - Micro Servers - Telemunication Network Routers - Industrial Automation Controls FIGURE 1. XR16L2550 BLOCK DIAGRAM FEATURES - 2.25 to 5.5 Volt operation - 5 Volt tolerant inputs - Pin-to-pin patible to Exar’s ST16C2450, ST16C2550 and XR16L2750 in 44-PLCC and 48TQFP packages - Pin-to-pin patible to XR16C2850 in 44-PLCC - Pin alike XR16L2551, XR16L2751 and XR16C2850 in 48-TQFP package - Two independent UART channels - Up to 3.125Mbps with external clock of 50 MHz - Register Set patible to 16C550 - 16 byte Transmit FIFO to reduce the bandwidth requirement of the external CPU - 16 byte Receive FIFO with error tags to reduce the bandwidth requirement of the external CPU - 4 selectable Receive FIFO interrupt trigger levels - Automatic RTS/CTS hardware flow control - Automatic Xon/Xoff software flow control - Wireless infrared encoder/decoder - Full Modem Interface (CTS#, RTS#, DSR#, DTR#, RI#, CD#) - Programmable character lengths (5,...