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XRT75R12 Datasheet(PDF) 1 Page - Exar Corporation |
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XRT75R12 Datasheet(HTML) 1 Page - Exar Corporation |
1 / 90 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XRT75R12 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER OCTOBER 2007 REV. 1.0.4 GENERAL DESCRIPTION The XRT75R12 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, Transmitters and Jitter Attenuators in a single 420 Lead TBGA package. Each channel of the XRT75R12 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 XRT75R12’s differential receiver provides high noise interference margin and is able to receive data over 1000 feet of cable or with up to 12 dB of cable attenuation. The XRT75R12 incorporates an advanced crystal- less jitter attenuator per channel that can be selected either in the transmit or receive path. The jitter attenuator performance meets the ETSI TBR-24 and Bellcore GR-499 specifications. The XRT75R12 provides a Parallel Microprocessor Interface for programming and control. The XRT75R12 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 75R12 ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE XRT75R12IB 420 Lead TBGA -40°C to +85°C XRT75R12 XRT75R12 Channel 11 Channel 0 Channel n... Device Monitor MTIP_n MRing_n DMO_n Timing Control Tx Pulse Shaping HDB3/ B3ZS Encoder Tx Control Jitter Attenuator MUX Line Driver Remote LoopBack HDB3/ B3ZS Decoder MUX AGC/ Equalizer Peak Detector LOS Detector Slicer Jitter Attenuator µProcessor Interface Local LoopBack Clock & Data Recovery Clock Synthesizer RD WR Addr[7:0] CS INT D[7:0] TxON TxClk_n TxPOS_n TxNEG_n RxClk_n RxPOS_n RxNEG/LCV_n RLOS_n RLOL_n RTIP_n RRing_n TTIP_n TRing_n CLKOUT_n SFM_en E3Clk DS3Clk STS-Clk/12M ICT Pmode RDY PCLK RESET |
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