XRT59L91 Datasheet, PDF (1/28 Pages) Exar Corporation – Single-Chip E1 Line Interface Unit

Preliminary
FEATURES
l Complete E1 (CEPT) line interface unit
(Transmitter and Receiver)
l Generates transmit output pulses that are
compliant with the ITU-T G.703 Pulse Template
for 2.048Mbps (E1) rates
l On-Chip Pulse Shaping for both 75W and 120W
Line Drivers
l Receiver can either be transformer or capaci-
tively-coupled to the line
l Detects and Clears LOS (Loss of Signal) per
ITU-T G.775
l Compliant with the ITU-T G.823 Jitter Tolerance
Requirements
l Compliant with the ITU-T G.703 EOS Over-
voltage protection requirements
XRT59L91
Single-Chip E1
Line Interface Unit
October 1999-1
l Supports both Local- and Remote-Loop back
Operations
l Logic Inputs accept either 3.3V or 5.0V levels
l Operates over the Industrial Temperature Range
l Ultra Low Power Dissipation
l +3.3V Supply Operation
APPLICATIONS
l PDH Multiplexers
l SDH Multiplexers
l Digital Cross-Connect Systems
l DECT (Digital European Cordless Telephone)
Base Stations
l CSU/DSU Equipment.
l Test Equipment
GENERAL DESCRIPTION
The XRT59L91 is an optimized single-chip analog 3.3V
E1 line interface unit (LIU) fabricated using low power
CMOS technology. The LIU IC consists of both a
Transmitter and a Receiver function. The Transmitter
accepts a TTL or CMOS level signal from the Terminal
Equipment; and outputs this data to the line via bipolar
pulses that are compliant to the ITU-T G.703 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 equip-
ment via CMOS level signals.
The receiver input can be transformer or capacitively-
coupled to the line. The receiver input is transformer-
coupled to the line, using the 2:1 step-down trans-
former. The transmitter is coupled to the line using a
1:2 step-up transformer. This same configuration is
applicable for both balanced (120W ) and unbalanced
(75W ) interfaces.
ORDERING INFORMATION
Part No.
XRT59L91ID
Package
16 LD JEDEC SOIC (300 mil)
Operating
Temperature Range
-40°C to +85°C
Rev. P2.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 · [phone] · FAX [phone]