8-Channel E1 Short-Haul Line Interface Unit with JA & CDR
Data Sheet


Long established in the E1 arena, Exar proves again it has the right combination of design expertise and market knowledge to bring innovative products to market. The XRT83SL28 (Eight channel E1 LIU) join several other E1 AFEs and LIUs to give designers a multitude of architecture combinations to meet, or exceed their OEM market requirements. This new E1 device, coupled with an already extensive product line including three seven-channel AFEs (XRT5897, XRT5997 and XRT81L27), several four-channel devices (XRT5894, XRT5793, XRT5794, and XRT82L24), plus three single-channel parts (XRT59L91, XRT7288 and XRT82D20), give EXAR a distinct marketplace advantage. This new product, along with Exar's other E1 LIUs and AFEs give customers a clear and rich product family spanning DS1/E1 to SONET/SDH. Applications for these new devices include multiplexers (PDH and SDH), digital cross connects, DECT (Digital European Cordless Telephone) base stations, and CSU/DSU equipment.

Overview of Products

The XRT83SL28 contains eight independent E1 channels, including independent jitter attenuators and data and clock recovery circuits for each channel. Each channel also performs the driver and receiver functions necessary to convert bipolar signals to logical levels, as well as the reverse. Devices with eight E1 channels provide the most efficient method of implementing 16-channel and 32- channel line cards.

Exar's R3 TechnologyTM (Reconfigurable, Relayless Redundancy), first introduced in 2002 as a breakthrough capability delivering key benefits to customers designing interface cards has now been extended to the E1 environment. The devices are Reconfigurable with integrated termination supporting both 75 and 100 W line impedances enabling customers to build one board with a single bill-of-materials, and gives them the agility to quickly respond and reconfigure devices for compressed design cycles without the unnecessary stock piling of inventory for all configurations. In addition, the XRT83SL28 employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel that can be brought on-line in the event of failure.


  • Eight independent E1 (CEPT) line interface units (transmitter and receiver) in one chip
  • Generates transmit output pulses that are compliant with the ITU-T G.703 pulse template for 2.048Mbps (E1) rates
  • On-chip pulse shaping
  • Compliant with ITU-T G. 838 jitter tolerance requirements
  • Declares and clears Loss of Signal (LOS) meeting ITU
  • G.775 standards
  • Ultra low power dissipation
  • Low power 3.3V operation
  • Functions over industrial temperature range
  • Pb-Free, RoHS Compliant Versions Offered


  • PDH multiplexers
  • SDH multiplexers
  • Digital cross-connect systems
  • DECT (Digital European Cordless Telephone) base stations
  • CSU/DSU equipment

Design Tools

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


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 24.0ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 60
  • Quantity per Reel: 750
  • Quantity per Tube: n/a
  • Quantity per Tray: 60
  • Reel Size (Dia. x Width x Pitch): 330 x 44 x 32
  • Tape & Reel Unit Orientation: Quadrant 2
  • Dimensions: mm
  • Length: 20
  • Width: 20
  • Thickness: 1.60
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
XRT83SL28IV LQFP144 -40 85 OBS
XRT83SL28IV-F LQFP144 -40 85 EOL Suggested:
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
XRT83SL28IV-F N Y Y Y L3 / 260ᵒC LQFP144

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
10/12/2019 Product Discontinuation Notice
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.
12/08/2009 Assembly supplier is changed from Unisem, Indonesia to ASAT, China. ASAT is an alternate qualified assembly supplier for this package family. There is no change to Form, Fit, or Function as stated in the applicable datasheet. Using an attached heat spreader to the die paddle will improve product manufacturability and it is readily available in ASAT.


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:

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