XRT5897 Datasheet, PDF (1/21 Pages) Exar Corporation – Seven-Channel E1 Line Interface

XRT5897
Seven-Channel E1
Line Interface
December 2001-3
FEATURES
D Compliant with ITU G.703 Pulse Mask Template for
2.048Mbps (E1) Rates
D Seven Independent CEPT Transceivers
D Supports Differential Transformer Coupled
Receivers and Transmitters
D On Chip Pulse Shaping for Both 75W and 120W Line
Drivers
D Compliant with ITU G.775 LOS Declaration/Clearing
Recommendation
D Optional User Selectable LOS Declaration/Clearing
Delay
D Compliant with ITU--T G.823 Jitter Tolerance Re-
quirements
D Logical Inputs Accept either 3.3V or 5.0V Levels
D Ultra-Low Power Dissipation
D +3.3V Supply Operation
D Individual Transmit Channel Over Temperature
Protection
APPLICATIONS
D SDH Multiplexer
D Digital Cross Connects
GENERAL DESCRIPTION
The XRT5897 is an optimized seven channel 3.3V line
interface unit fabricated using low power CMOS
technology. The device contains seven independent E1
channels. It is primarily targeted toward SDH multiplexers
that accommodate TU12 Tributary Unit Frames. Line
cards in these units multiplex 21 E1 interfaces into higher
SDH rates. Devices with seven E1 interfaces such as the
XRT5897 provide the most efficient method of
implementing 21 channel line cards. Each channel
performs the driver and receiver functions necessary to
convert bipolar signals to logical levels and vice versa.
The device requires transformers on both receiver and
transmitter sides, and supports both balanced and
unbalanced interfaces.
The device offers two distinct modes of LOS detection.
The first method, which does not require an external
clock, provides an LOS output indication signal with
thresholds and delay that comply with the ITU G.775
requirements. In the second mode, the user provides an
external clock that increases the delay for LOS
declaration and clearing. This feature provides the user
with the flexibility to implement LOS specifications that
require a delay greater than the G.775 requirements.
ORDERING INFORMATION
Part No.
XRT5897IV
Package
100 Lead TQFP (14 x 14 x 1.4mm)
Operating
Temperature Range
-40°C to +75°C
Rev. 1.11
E2001
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z [phone] z FAX [phone]