Preliminary
XRT59L91
Single-Chip E1
Line Interface Unit
October 1999-1
FEATURES
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Complete E1 (CEPT) line interface unit
(Transmitter and Receiver)
Generates transmit output pulses that are
compliant with the ITU-T G.703 Pulse Template
for 2.048Mbps (E1) rates
On-Chip Pulse Shaping for both 75W and 120W
Line Drivers
Receiver can either be transformer or capaci-
tively-coupled to the line
Detects and Clears LOS (Loss of Signal) per
ITU-T G.775
Compliant with the ITU-T G.823 Jitter Tolerance
Requirements
Compliant with the ITU-T G.703 EOS Over-
voltage protection requirements
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Supports both Local- and Remote-Loop back
Operations
Logic Inputs accept either 3.3V or 5.0V levels
Operates over the Industrial Temperature Range
Ultra Low Power Dissipation
+3.3V Supply Operation
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APPLICATIONS
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PDH Multiplexers
SDH Multiplexers
Digital Cross-Connect Systems
DECT (Digital European Cordless Telephone)
Base Stations
CSU/DSU Equipment.
Test Equipment
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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
·
(510) 668-7000
·
FAX (510) 668-7017
EXAR [ EXAR CORPORATION ]
