WAN Clock
Data Sheet EOL (End of Life)


Information WAN Clock
Package SOIC-18
Input Freq Range 8kHz to 32,768kHz
No. of PLLs 2
Op Current 5.0V, 3.3V
Output Freq Range 56kHz to 16,384kHz
Temperature Ind.
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The XRT8001 is a single-chip, dual phase-locked loop clock adapter for WAN and ISDN applications. This product accommodates the most popular frequencies encountered in T1/E1 access equipment, T1/E1 multiplexers and concentrators, sub-rate switches, routers, Frame Relay Access Devices (FRADs), Remote Access Servers (RASs) and both PRI and BRI ISDN equipment.

Using a serial processor interface the designer can fully control the operational modes of the device by modifying the content of the internal registers. Designed with two internal phase locked loops, the XRT8001 generates two output clocks from a single input reference clock. Each of the two outputs can be independently programmed to generate frequency multiples of 64kHz and 56kHz from T1 and E1 rates.

The extremely impressive jitter performance of the XRT8001 makes it ideal for any equipment deployed in public or private networks with strict regulatory requirements. The device synthesizes two low-jitter clocks with user-selected, industry-standard frequencies, phased-locked to the system reference timing, making it capable of generating less than 0.05UI of wideband.

This chip has several modes of operation to provide designers with greatest flexibility. In the forward master mode, XRT8001 accepts up to 16th harmonic of either 1.544MHz (T1) or 2.048MHz (E1) as input reference, and generates multiples of 56kHz or 64kHz. In the reverse master mode, an input clock of 56kHz or 64kHz is used to generate 1.544MHz (T1) or 2.048MHz (E1) output clocks. In the fractional T1/E1 reverse master mode, the XRT8001 accepts up to the 32nd harmonic of 56kHz or 64kHz as input reference, and generates either 1.544MHz (T1) or 2.048MHz (E1). In the E1 to T1 master mode, the device acccepts up to the 16th harmonic of 2.048MHz (E1) as input reference and generates 1.544MHz (T1). In the high speed reverse mode, the XRT8001 accepts 64kHz as input reference and generates multiples (1, 2, 4, or 8) of 2.048MHz (E1).

The forward and reverse modes can also be operated in slave configuration where the device generates the same output frequencies as master configuration while being phase locked to an 8kHz input reference.

  • Clock adaptation for most popular telecommunication frequencies
  • Wide input frequency range
  • Programmable output frequencies
  • Less than 0.05UI wide band output jitter
  • Low power operation (5V and 3.3V)
  • Maximum lock time of 45ms
  • Pb-Free, RoHS Compliant Versions Offered

  • Frame Relay Access Devices (FRADs)
  • Basic Rate (BRI) and Primary Rate (PRI) ISDN terminals
  • Concentrators and multiplexers

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets XRT8001 WAN Clock for T1 and E1 Systems 1.0.1 October 2001 1 MB
Schematics & Design Files Evaluation Board Schematic B November 2006 23.3 KB
Product Brochures Interface Brochure October 2019 1.3 MB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
XRT8001ID-F N Y Y Y Y L3 / 260ᵒC WSOIC18
XRT8001IDTR-F N Y Y Y Y L3 / 260ᵒC WSOIC18

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

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now PDN
XRT8001ID-F WSOIC18 -40 85 EOL
XRT8001IDTR-F WSOIC18 -40 85 EOL
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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.


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-001
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: n/a
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: n/a
  • Quantity per Tube: 20
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): n/a
  • Tape & Reel Unit Orientation: n/a
  • Dimensions: inch
  • Length: 0.90
  • Width: 0.25
  • Thickness: 0.13
  • Lead Pitch: 0.10
  • JEDEC Reference: MS-013
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: n/a
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 41
  • Quantity per Reel: 1500
  • Quantity per Tube: 41
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 12
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 11.55
  • Width: 7.50
  • Thickness: 2.65
  • Lead Pitch: 1.27


Distribution Date Description File
02/03/2022 Product Discontinuation Notice
08/10/2017 Qualification of alternate assembly subcon, ANST.
02/26/2014 Qualification of an alternate qualified 18L WSOIC production site, Greatek, Taiwan, in addition to the current production site, Cirtek, Philippines. Alternate assembly site.
03/05/2012 Product Discontinuation Notice. Discontinuance of the .300” PDIP package by our assembly supplier.
07/15/2010 Change in packing quantity per reel. Standardization
02/04/2010 Elimination of the back marking. Standardization.
10/09/2009 To add an alternate assembly supplier. Capacity enhancement.

FAQs & Support

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.

Submit a Technical Support Question As a New Question

The -F suffix indicates ROHS / Green compliance:

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.