WAN Clock Synchronizer/Adapter for Communications
OBS (Obsolete)
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Information WAN Clock Synchronizer/Adapter for Communications
Package SOIC-18
Input Freq Range 8kHz to 32,768kHz
No. of PLLs 2
Op Current 5.0V, 3.3V
Output Freq Range 150Hz to 2,048kHz
Temperature (°C) 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 ates.

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 tp 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
Schematics & Design Files Evaluation Board Schematic B November 2006 23.3 KB
Product Brochures Interface Brochure October 2019 1.3 MB
Simulation Models
Package Type Vcc Temp Mode Version File
SOIC 3.3V Industrial 2
SOIC 5V Industrial 2
PDIP 3.3V Industrial 2
PDIP 5V Industrial 3
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package

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 PDN
XRT8000ID-F WSOIC18 -40 85 OBS
XRT8000IDTR-F WSOIC18 -40 85 OBS XRT8000ID-F
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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-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.
07/12/2017 Product Discontinuation Notice
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.

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The -F suffix indicates ROHS / Green compliance: