2-Channel DS3/E3/STS-1 Line Interface Unit
Data Sheet


The XRT73L02M is a two-channel fully integrated Line Interface Unit (LIU) for E3/DS3/STS-1 applications. It incorporates independent Receivers, Transmitters in a single 100 pin TQFP package.

The XRT73L02M can be configured to operate in either E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz) modes.The transmitter can be turned off or tri-stated for redundancy support and for conserving power.

The XRT73L02M’s differential receiver provides high noise interference margin and is able to receive the data over 1000 feet of cable or with up to 12 dB of cable attenuation.

The XRT73L02M provides both Serial Microprocessor Interface as well as Hardware mode for programming and control.

The XRT73L02M supports local, remote and digital loop-backs. The XRT73L02M also contains an on-board Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error.


  • On chip Clock and Data Recovery circuit for high input jitter tolerance
  • Meets the jitter tolerance requirements as specified in ITU-T G.823_1993 for E3 and Telcordia GR-499-CORE for DS3 applications
  • Detects and Clears LOS as per G.775
  • Receiver Monitor mode handles up to 20 dB flat loss with 6 dB cable attenuation
  • On chip B3ZS/HDB3 encoder and decoder that can either be enabled or disabled
  • On-chip clock synthesizer generates the appropriate rate clock from a single frequency XTAL
  • Provides low jitter clock outputs for either DS3, E3 or STS-1 rates
  • On-chip clock synthesizer provides the appropriate rate clock from a single 12.288 MHz Clock
  • Provides low jitter output clock
  • Compliant with Bellcore GR-499, GR-253 and ANSI T1.102 Specification for transmit pulse
  • Tri-state Transmit output capability for redundancy applications
  • Transmitter can be turned on or off
Control and Diagnostics:
  • 5 wire Serial Microprocessor Interface for control and configuration
  • Supports optional internal Transmit Driver Monitoring
  • PRBS error counter register to accumulate errors
  • Hardware Mode for control and configuration
  • Supports Local, Remote and Digital Loop-backs
  • Single 3.3 V ± 5% power supply
  • 5V Tolerant I/O
  • Available in 100 pin TQFP
  • -40°C to 85°C Industrial Temperature Range
  • Pb-Free, RoHS Compliant Versions Offered


  • E3/DS3 Access Equipment
  • STS1-SPE to DS3 Mapper
  • DSLAMs
  • Digital Cross Connect Systems
  • CSU/DSU Equipment
  • Routers
  • Fiber Optic Terminals

Design Tools

Simulation Models
Package Type Vcc Temp Mode Version File
TQFP 3.3V Industrial 3


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 45.7ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 1000¹
  • Quantity per Tube: n/a
  • Quantity per Tray: 90
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 20
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 14.00
  • Width: 14.00
  • Thickness: 1.60
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
XRT73L02MIV-F LQFP100 -40 85 Active Order
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
XRT73L02MIV-F N Y Y Y L3 / 260ᵒC TQFP100

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.
Distribution Date Description File
04/04/2017 Qualification of alternate assembly subcon, Greatek, Taiwan.
07/26/2016 Product discontinuation notification. Discontinued.
07/18/2014 Elimination of back mark. Eliminate back mark; consolidate information in top mark.
12/05/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan) for assembly using copper or gold wire bonding. Material change and alternate assembly site.
10/03/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan). Material change and alternate assembly site.


Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.

Frequently Asked Questions

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

The -F suffix indicates ROHS / Green compliance:

Submit a Technical Support Question As a New Question