XR16L2551 Datasheet | Exar

.. áç SEPTEMBER 2003 LOW VOLTAGE DUART WITH POWERSAVE REV. 1.0.0 GENERAGENERAL DESCRIPTION The XR16L2551 (L2551) is a low voltage dual universal asynchronous receiver and transmitter (UART) with 5 Volt tolerant inputs. The device includes additional capability over the ST16C2550: Intel and Motorola data bus interface selection, hardware and software flow control, infrared encoder/ decoder, sleep mode and a Power Save mode for battery operation. The L2551’s enhanced register set is patible to the ST16C2550 and XR16L2550. It supports the Exar’s enhanced Features of 16 bytes of TX and RX FIFOs and a plete modem interface. Onboard registers provide the user with operational status and data error tags. An internal loopback capability allows onboard diagnostics. Independent programmable baud rate generator is provided in each channel to support data rates up to 3.125 Mbps. NOTE: 1 Covered by U.S. Patent #5,649,122. Features - 2.25 to 5.5 Volt Operation - 5 Volt Tolerant Inputs - Intel or Motorola Bus Interface Select (16/68#) pin - Pin-to-pin patible to XR16L2751CM - Two Independent UARTs s Up to 3.125 Mbps at 5V, 2 Mbps at 3.3V, and 1 Mbps at 2.5V with external clock input Up to 1.5 Mbps at 5V, 1.25 Mbps at 3.3V and 1 Mbps at 2.5V with crystal clock input 16 bytes of Transmit and Receive FIFOs Automatic RTS/CTS hardware flow control Automatic Xon/Xoff software flow control Wireless infrared encoder/decoder Receive FIFO trigger levels select Programmable character lengths (5, 6, 7 or 8) with even, odd, forced or no parity Full Modem Interface (CTS#, RTS#, DSR#, DTR#, RI#, CD#) in the 48-TQFP package s s s s s s s APPLICATIONS - Battery Operated Instruments - Data Port Adapters - Handheld Appliances - Radio Frequency Data Modems - Base Stations - USB Hubs - Industrial Automation Controls FIGURE 1. XR16L2551 BLOCK DIAGRAM s - Sleep Mode with Power Save feature for battery operation - Industrial Temperature range - Tiny...