Codirectional Digital Data Processor
OBS (Obsolete)
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Information Codirectional Digital Data Processor
Package SOIC-28
# of Channels 1
Clk Rec Yes
Data Rate(s) 64Kbps, E1
Op Pwr Sup/Max Cur 5V ±10%, 2mA
SH/LH n/a
Temperature (°C) I
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The XRT6166 is a CMOS device which contains the digital circuitry necessary to interface both directions of a 64kbps data stream to 2.048Mbps transmit and receive PCM time-slots. The XRT6166 and the companion XRT6164 line interface chip together form a CCITT G.703 compliant 64Kbps codirectional interface.

The XRT6166 contains separate transmit and receive sections. The transmitter transforms 8-bit serial data from a 2.048Mbps time-slot into an encoded 64Kbps data stream. The receiver, which performs the reverse operation, decodes the 64kbps data, extracts a clock signal, and then outputs the data to a 2.048Mbps time-slot. The XRT6166 provides features which allow the repetitions and deletions of both received and transmitted data as clock skews and transients occur. These slip occurrences are indicated by byte insertion and deletion flags. Outputs are also provided for extracted receive clock and clock recovery circuit loss of lock.

  • Low Power CMOS Technology
  • All Receiver and Transmitter Inputs and Outputs are TTL-Compatible
  • Transmitter Inhibits Bipolar Violation Insertion for Transmission of Alarm Conditions
  • Alarm Output Indicates Loss of Received Bipolar Violations
  • Tolerance of 125ms Variance of Data Transfer Timing in Both Transmit and Receive Paths Allows Operation in Plesiochronous Networks
  • Both Receiver and Transmitter Perform Byte Insertion or Deletion in Response to Local Clock Slips and Provide Outputs Indicating Slip Logic Activity
  • Pb-Free, RoHS Compliant Versions Offered

  • CCITT G.703 Compliant 64kbps Codirectional Interface
  • Performs the Digital and Analog Functions for a Complete 64Kbps Data Adaption Unit (DAU) When Used With the XR-T6164

Documentation & Design Tools

Type Title Version Date File Size
User Guides & Manuals Evaluation System User Manual 2.0.0 December 1996 1.5 MB
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

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
XRT6166CD-F WSOIC28 0 70 OBS
XRT6166ID-F WSOIC28 -40 85 OBS
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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: 58.6ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 27
  • Quantity per Reel: 1500
  • Quantity per Tube: 27
  • 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: 17.90
  • Width: 7.50
  • Thickness: 2.65
  • Lead Pitch: 1.27


Distribution Date Description File
02/03/2022 Product Discontinuation Notice
07/11/2017 Product Discontinuation Notification
11/16/2015 Updated information subsequent to original published PCN 15-0625-02 on 09/29/2015. Addendum: Update to package marking.
09/29/2015 Greatek as alternate assembly site Addition of an alternate production site, Greatek, Taiwan for 16L, 24L and 28L SOICW
07/15/2010 Change in packing quantity per reel. Standardization
10/13/2009 Notice of Obsolescence. Discontinued due to low market demand, effective immediately.

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The -F suffix indicates ROHS / Green compliance: