XRT59L91 Single-Chip E1 Line Interface Unit October 1999-1 FEATURES l Complete E1 (CEPT) line interface unit l Supports both Local- and Remote-Loop back Operations (Transmitter and Receiver) l Logic Inputs accept either 3.3V or 5.0V levels l Generates transmit output pulses that are compliant with the ITU-T G.703 Pulse Template l Operates over the Industrial Temperature Range for 2.048Mbps (E1) rates l Ultra Low Power Dissipation l On-Chip Pulse Shaping for both 75 and 120 l +3.3V Supply Operation Line Drivers l Receiver can either be transformer or capaci- APPLICATIONS tively-coupled to the line l PDH Multiplexers l Detects and Clears LOS (Loss of Signal) per l SDH Multiplexers ITU-T G.775 l Digital Cross-Connect Systems l Compliant with the ITU-T G.823 Jitter Tolerance Requirements l DECT (Digital European Cordless Telephone) Base Stations l Compliant with the ITU-T G.703 EOS Over- l CSU/DSU Equipment. voltage protection requirements l Test Equipment GENERAL DESCRIPTION The XRT59L91 is an optimized single-chip analog E1 The receiver input can be transformer or capacitively- line interface unit (LIU) fabricated using low power, coupled to the line. The receiver input is transformer- 3.3V CMOS technology. The LIU IC consists of both coupled to the line, using the 2:1 step-down trans- a Transmitter and a Receiver function. The Transmit- former. The transmitter is coupled to the line using a ter accepts a TTL or CMOS level signal from the 1:2 step-up transformer. This same configuration is Terminal Equipment and outputs this data to the line applicable for both balanced (120) and unbalanced via bipolar pulses that are compliant to the ITU-T G.703 (75) interfaces. pulse template for E1. The Receiver accepts an attenuated bipolar line signal (from the remote terminal equipment) and outputs this data to the (near-end) terminal equipment via CMOS level signals. ORDERING INFORMATION Part No. Package Operating Temperature Range XRT59L91ID 16 LD JEDEC SOIC (300 mil) -40C to +85C Rev. 1.0.0 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017XRT59L91 RxLOS RTIP RxPOS Peak Detector/ Recei Peak Receive Receive LOS Receive Output LOS Equave liz DeStectliceor/ Detect InOteutrputfac Equalizer Interface Slicer Detector RRing er r or e RxNEG Loca Local Remot Loopl Loop Back Remote LLoop Loope RLoop Back MUX Loop Back MUX Back MUX MUX TTIP TxPOS Pulse SPuhlsape ing TranTsranmismt Inputit TxNEG CiCircrcuuiti Interfac Shaping Input Interface t e TxClk TRing Figure 1. XRT59L91 Block Diagram Rev. 1.0.0 2