XRT73LC00A_08 Datasheet, PDF (1/63 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73LC00A
AUGUST 2008
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
GENERAL DESCRIPTION
The XRT73LC00A DS3/E3/STS-1 Line Interface Unit
is a low power CMOS version of the XRT73L00A and
consists of a line transmitter and receiver integrated
on a single chip and is designed for DS3, E3 or
SONET STS-1 applications.
XRT73LC00A can be configured to support the E3
(34.368 Mbps), DS3 (44.736 Mbps) or the SONET
STS-1 (51.84 Mbps) rates.
In the transmit direction, the XRT73LC00A encodes
input data to either B3ZS (for DS3/STS-1
applications) or HDB3 (for E3 applications) format
and converts the data into the appropriate pulse
shapes for transmission over coaxial cable via a 1:1
transformer.
In the receive direction the XRT73LC00A performs
equalization on incoming signals, performs Clock
Recovery, decodes data from either B3ZS or HDB3
format, converts the receive data into TTL/CMOS
format, checks for LOS or LOL conditions and detects
and declares the occurrence of line code violations.
The XRT73LC00A also contains a 4-Wire
Microprocessor Serial Interface for accessing the on-
chip Command registers.
FEATURES
• Incorporates an improved Timing Recovery circuit
and is pin and functional compatible to XRT73L00A
• Meets E3/DS3/STS-1 Jitter Tolerance
Requirements
• Full Loop-Back Capability
• Transmit and Receive Power Down Modes
• Full Redundancy Support
• Contains a 4-Wire Microprocessor Serial Interface
• Uses Minimum External components
• Low Power CMOS Design
• Single +3.3V Power Supply
• 5 V Tolerant pins
• -40°C to +85°C Operating Temperature Range
• Available in a 44 pin TQFP package
APPLICATIONS
• Interfaces to E3, DS3 or SONET STS-1 Networks
• CSU/DSU Equipment
• PCM Test Equipment
• Fiber Optic Terminals
• Multiplexers
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com