XRT83SL28

•Fully integrated 8-Channel short haul transceivers for E1 (2.048MHz) applications.
•Internal Impedance matching on both receive and transmit for 75 (E1) or 120 (E1) applications.
•Tri-State on a per channel basis for the transmit selection.
•On-Chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel basis.
•Independent Crystal-Less digital jitter attenuators (JA) with 32-Bit or 64-Bit FIFO for the receive or transmit paths
•Driver failure monitor output (DMO) alerts of possible system or external component problems.
•Transmit outputs and receive inputs may be "High" impedance for protection or redundancy applications on a per channel basis.
•Support for automatic protection switching.
•1:1 and 1+1 protection without relays.
•RLOS/AIS according to ITU-T G.775 or ETSI-300-233.
•On-Chip HDB3 encoder/decoder for each channel.
•On-Chip digital clock recovery circuit for high input jitter tolerance.
•Line code error and bipolar violation detection.
•Transmit all ones (TAOS) for the Transmit and Receive Outputs.
•Supports local analog, remote, and digital loopback modes.
•Supports gapped clocks for mapper/multiplexer applications.
•Low Power dissipation
•Single 3.3V supply operation (3V to 5V I/O tolerant).
•144-Pin TQFP package
•-40°C to +85°C Temperature Range

The XRT83SL28 is a fully integrated 8-channel E1 short-haul LIU which optimizes system cost and performance by offering key design features. The XRT83SL28 operates from a single 3.3V power supply. The LIU features are programmed through a standard serial microprocessor interface or hardware control. EXAR's LIU has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the LIU is powered off. Key design features within the LIU optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays.
Additional features include TAOS for transmit and receive, RLOS, LCV, AIS, DMO, and diagnostic loopback modes.