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XRT85L61IG Datasheet(PDF) 1 Page - Exar Corporation |
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XRT85L61IG Datasheet(HTML) 1 Page - Exar Corporation |
1 / 16 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XRT85L61 BITS (BUILDING INTEGRATED TIMING SUPPLY) CLOCK EXTRACTOR FEBRUARY 2004 REV. 1.0.1 GENERAL DESCRIPTION The XRT85L61 is an integrated E1, T1, 64KHz Centralized Clock interface for T1 (1.544Mbps) 100 Ω, E1 (2.048Mbps) 75 Ω or 120Ω applications. The XRT85L61 extracts either 2048kHz or 1544 kHz clock signals from an E1 (2.048 MHz), T1 (1.544 Mhz) inputs respectively or 64 KHz, 8kHz or 400 Hz clock signals from the 64kHz reference clock input. The XRT85L61 includes an on-chip crystal-less jitter attenuator with 32 bit FIFO that can either be enabled or disabled. FEATURES • Fully integrated single chip solution for E1,T1 or 64 kHz clock synchronization applications. • Extracts 2048 kHz, 1544 kHz clock and data com- ponents • Extracts 64 KHz and 8 kHz, 400 Hz clock informa- tion • Line Code Violation alarms • On-chip digital clock recovery circuit • Supports 75Ω and 120Ω (E1), 100Ω (T1) applica- tions. • Crystal-less digital jitter attenuator with 32-bit FIFO that can either be enabled or disabled • Receive loss of signal (RLOS) output • Meets Telcordia GR-1244-CORE Section 3.4.1 R3- 27 specification • Meets or exceeds T1 and E1 specifications in ITU G.703, G.775 • Single +3.3V Supply Operation • Logic inputs accept either 3.3 V or 5 V levels • 28 pin TSSOP package APPLICATIONS • Universal Clock Synchronization for G.703 Telecom Formats • T1/E1 Line Receiver with Clock and Data Recovery • DSLAM FIGURE 1. BLOCK DIAGRAM OF THE XRT85L61 Master Clock Generator Rx Equalizer MCLK1 (1.544 MHz for T1) MCLK2 (2.048 MHz for E1 or 64 kbps) Reference Inputs RTIP RRING Line Side Peak Detector and Slicer Clock and Data Recovery Jitter Attenuator Clock Extractor Line code and clock violation Detector RPOS RNEG RCLK (64kHz,1544kHz or 2048kHz) 8 kHz (for 64 kbps) 400 Hz (for 64 kbps) RCLK_LCV/AIS 8 kHz_LCV/BPV 400 Hz_LCV LOS Detector RLOS Mode Select T1, E1 or 64 kbps S1 S2 S3 (T1 or E1 or 64 kbps input) JAEN DATAMUT DATA_INV RCLKINV |
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