XRT5997 Datasheet, PDF (1/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
Seven-Channel E1
Line Interface Unit
November 1999-2
FEATURES
The Main features are as follows:
l Consists of Seven (7) Independent E1 (CEPT)
Line Interface Units (Transmitter and Receiver)
l Generates Transmit Output Pulses that are
Compliant with the ITU-T G.703 Pulse Template
Requirement for 2.048Mbps (E1) Rates
l On-Chip Pulse Shaping for both 75Ω and 120Ω
line drivers
l Receiver Can Either Be Transformer or
Capacitive-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 ITU G. 703 EOS Over-voltage
protection Requirement
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
GENERAL DESCRIPTION
The XRT5997 is an optimized seven-channel analog
E1 line interface unit fabricated using low power 3.3V
CMOS technology. Each channel 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.
Each Receiver input can be transformer or capacitive-
coupled to the line. The Receiver input is transformer-
coupled to the line, using a 2:1 step-down transformer.
Each Transmitter is coupled to the line using a 1:2 step-
up transformer. This same configuration is applicable
for both balanced (120Ω ) and unbalanced (75Ω )
interfaces.
ORDERING INFORMATION
Part No.
XRT5997IV
Package
100-Lead TQFP (14 x 14 x 1.4 mm)
Operating
Temperature Range
-40°C to +85°C
Rev. 1.0.0
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone] • www.exar.com