XRT83VSH28

www.DataSheet4U.com AUGUST 2006 PRELIMINARY XRT83VSH28 REV. P1.0.0 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT GENERAL DESCRIPTION The XRT83VSH28 is a fully integrated 8-channel short-haul line interface unit (LIU) that operates from a 1.8V and a 3.3V power supply. Using internal termination, the LIU provides one bill of materials to operate in E1 75Ω or 120Ω mode with minimum external components. The LIU features are programmed through a standard parallel or serial microprocessor interface. 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. The on-chip clock synthesizer generates an E1 clock reference. Additional features include RLOS, a 16-bit LCV counter for each channel, AIS, QRSS generation/ detection, TAOS, DMO, and diagnostic loopback modes. APPLICATIONS ISDN Primary Rate Interface CSU/DSU E1 Interface E1 LAN/WAN Routers Public switching Systems and PBX Interfaces E1 Multiplexer and Channel Banks FIGURE 1. BLOCK DIAGRAM OF THE XRT83VSH28 E1 LIU (HOST MODE) MCLKE1 MASTER CLOCK SYNTHESIZER MCLKOUT 1 of 8 channels, CHANNEL _n TPOS_n/ TDATA_n TNEG_n/ CODES_n TCLK_n QRSS PATTERN GENERATOR HDB3/ ENCODER TX/ RX JITTER ATTENUATOR TAOS DRIVE MONITOR TX FILTER & PULSE SH...