XRT5894 Datasheet, PDF (1/19 Pages) Exar Corporation – Four-Channel E1 Line Interface (3.3V or 5.0V)

XRT5894
Four-Channel E1
Line Interface (3.3V or 5.0V)
March 2000-3
FEATURES
D Compliant with ITU G.703 Pulse Mask Template for
2.048Mbps (E1) Rates
D Four 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 Logical Inputs Accept either 3.3V or 5.0V Levels
D Ultra-Low Power Dissipation
D +3.3V or 5.0V Supply Operations
D Individual Transmit Channel Over Temperature
Protection
APPLICATIONS
D SDH Multiplexer
D Digital Cross Connects
GENERAL DESCRIPTION
The XRT5894 is an optimized four channel 3.3V line
interface unit fabricated using low power CMOS
technology. The device contains four independent E1
channels. 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.
XRT5894IV
Package
64 Lead TQFP (10 x 10 x 1.4mm)
Operating
Temperature Range
-40°C to +85°C
Rev. 1.10
E2000
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z [phone] z FAX [phone]