xr XRT85L61 BITS (BUILDING INTEGRATED TIMING SUPPLY) CLOCK EXTRACTOR OCTOBER 2004 REV. 1.0.2 GENERAL DESCRIPTION On-chip digital clock recovery circuit Supports 75 and 120 (E1), 100 (T1) The XRT85L61 is an integrated E1, T1, 64KHz applications. Centralized Clock interface for T1 (1.544Mbps) 100, Crystal-less digital jitter attenuator with 32-bit FIFO E1 (2.048Mbps) 75 or 120 applications. that can either be enabled or disabled The XRT85L61 extracts either 2048kHz or 1544 kHz Receive loss of signal (RLOS) output clock signals from an E1 (2.048 MHz), T1 (1.544 Mhz) inputs respectively or 64 KHz, 8kHz or 400 Hz Meets Telcordia GR-1244-CORE Section 3.4.1 R3- clock signals from the 64kHz reference clock input. 27 specification The XRT85L61 includes an on-chip crystal-less jitter Meets or exceeds T1 and E1 specifications in ITU attenuator with 32 bit FIFO that can either be enabled G.703, G.775 or disabled. Single +3.3V Supply Operation FEATURES Logic inputs accept either 3.3 V or 5 V levels Fully integrated single chip solution for E1,T1 or 64 28 pin TSSOP package kHz clock synchronization applications. APPLICATIONS Extracts 2048 kHz, 1544 kHz clock and data components Universal Clock Synchronization for G.703 Telecom Extracts 64 KHz and 8 kHz, 400 Hz clock Formats information T1/E1 Line Receiver with Clock and Data Recovery Line Code Violation alarms DSLAM FIGURE 1. BLOCK DIAGRAM OF THE XRT85L61 RCLKINV DATA INV DATAMUT JAEN Reference Inputs MCLK1 (1.544 MHz for T1) Master Clock Generator MCLK2 (2.048 MHz for E1 RPOS or 64 kbps) Clock RNEG Extractor RCLK RTIP Clock and (64kHz,1544kHz or 2048kHz) Jitter Rx Peak Detector 8 kHz (for 64 kbps) Line Side Line code Data Attenuator Equalizer and Slicer 400 Hz (for 64 kbps) and clock Recovery RRING (T1 or E1 or 64 kbps input) violation RCLK LCV/AIS Detector 8 kHz LCV/BPV 400 Hz LCV S1 Mode Select LOS S2 T1, E1 or 64 kbps RLOS Detector S3 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XRT85L61 xr BITS (BUILDING INTEGRATED TIMING SUPPLY) CLOCK EXTRACTOR REV. 1.0.2 ORDERING INFORMATION PART NUMBER PACKAGE OPERATING TEMPERATURE RANGE XRT85L61IG 28 Lead TSSOP -40 C to +85 C FIGURE 2. PIN OUT OF THE XRT85L61 1 28 RCLKINV MCLK1 1 28 RCLKINV MCLK1 2 27 MCLK2 DATA LCV 3 26 RCLK LCV JAEN 2 27 DATA INV JAEN 4 25 JAVDD 8 KHz LCV JAGND 5 24 400 Hz LCV 3 26 RCLK LCV/ AIS MCLK2 6 23 8 KHz ICT 4 25 8 KHz LCV/ BPV JAVDD RTIP 7 22 400 Hz 8 21 RLOS RRING 5 24 400 Hz LCV JAGND DVDD AVDD 9 20 AGND 10 19 DGND 6 23 8 KHz ICT RCLK S1 11 18 RPOS 7 S2 12 17 22 400 Hz RTIP S3 RNEG 13 16 RLOS RRING 8 21 DATMUT NC 14 15 DVDD AVDD 9 20 DGND AGND 10 19 RCLK S1 11 18 RPOS S2 12 17 RNEG S3 13 16 DATMUT NC 14 15 2