XRT73R12 Datasheet | Exar

DESCRIPTION The XRT73R12 is a twelve channel fully integrated Line Interface Unit (LIU) featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy) for E3/DS3/STS-1 applications. The LIU incorporates 12 independent Receivers and Transmitters in a single 420 Lead TBGA package. Each channel of the XRT73R12 can be independently configured to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz). Each transmitter can be turned off and tri-stated for redundancy support or for conserving power. The XRT73R12’s differential receiver provides high noise interference margin and is able to receive data over 1000 feet of cable or with up to 12 d B of cable attenuation. The XRT73R12 provides a Parallel Microprocessor Interface for programming and control. The XRT73R12 supports analog, remote and digital loop-backs. The device also has a built-in Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error for diagnostic purposes. APPLICATIONS - E3/DS3 Access Equipment - DSLAMs - Digital Cross Connect Systems - CSU/DSU Equipment - Routers - Fiber Optic Terminals FIGURE 1. BLOCK DIAGRAM OF THE XRT 73R12 CS RD WR Addr[7:0] D[7:0] PCLK RDY INT Pmode RESET CLKOUT_n µProcessor Interface SFM_en RLOL_n E3Clk DS3Clk STS-Clk/12M Peak Detector Slicer Clock & Data Recovery LOS Detector Clock Synthesizer HDB3/ B3ZS Decoder RTIP_n RRing_n AGC/ Equalizer Rx Clk_n Rx POS_n Rx NEG/LCV_n Local Loop Back Remote Loop Back RLOS_n Tx Clk_n Tx POS_n Tx NEG_n TTIP_n TRing_n MTIP_n MRing_n DMO_n ICT Line Driver Tx Pulse Shaping Timing Control HDB3/ B3ZS Encoder Device Monitor Tx Control Tx ON Channel 0 Channel n... Channel 11 ORDERING INFORMATION PART NUMBER XRT73R12IB PACKAGE 420 Lead TBGA OPERATING TEMPERATURE RANGE -40°C to +85°C Exar Corporation 48720 Kato Road, Fremont CA, 94538 - (510) 668-7000 - FAX (510) 668-7017 - .exar. REV. P1.0.3 PRELIMINARY TWELVE CHANNEL E3/DS3/STS-1 LINE...