Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs

Please check latest availability status for a specific part variant.


The DS3251 (single), DS3252 (dual), DS3253 (triple), and DS3254 (quad) line interface units (LIUs) perform the functions necessary for interfacing at the physical layer to DS3, E3, or STS-1 lines. Each LIU has independent receive and transmit paths and a built-in jitter attenuator. An on-chip clock adapter generates all line-rate clocks from a single input clock. Control interface options include 8-bit parallel, SPI, and hardware mode.
DS3251, DS3252, DS3253, DS3254: Functional Diagram DS3251, DS3252, DS3253, DS3254: Functional Diagram Enlarge+

Key Features

  • Pin-Compatible Family of Products
  • Each Port Independently Configurable
  • Receive Clock and Data Recovery for up to 380 meters (DS3), 440 meters (E3), or 360 meters (STS-1) of 75Ω Coaxial Cable
  • Standards-Compliant Transmit Waveshaping
  • Three Control Interface Options: 8-Bit Parallel, SPI, and Hardware Mode
  • Built-In Jitter Attenuators can be Placed in Either the Receive or Transmit Paths
  • Jitter Attenuators Have Provisionable Buffer Depth: 16, 32, 64, or 128 Bits
  • Built-In Clock Adapter Generates All Line-Rate Clocks from a Single Input Clock (DS3, E3, STS-1, OC-3, 19.44MHz, 38.88MHz, 77.76MHz)
  • B3ZS/HDB3 Encoding and Decoding
  • Minimal External Components Required
  • Local and Remote Loopbacks
  • Low-Power 3.3V Operation (5V Tolerant I/O)
  • Industrial Temperature Range: -40°C to +85°C
  • Small Package: 144-Pin, 13mm x 13mm Thermally Enhanced CSBGA
  • Drop-In Replacement for DS3151/DS3152/DS3153/DS3154 LIUs
  • IEEE 1149.1 JTAG Support
  • Applications/Uses

    • Access Concentrators
    • ATM and Frame Relay Equipment
    • CSUs/DSUs
    • Digital Cross-Connects
    • DSLAMs
    • PBXs
    • Routers/Switches
    • SONET/SDH and PDH Multiplexers

    Tools & Models

  • DS3252 BSDL Model
  • Product Reliability Reports: DS3252.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources

    Ultra-Wideband, Direct-Conversion, L-Band Satellite Tuner

    • 925MHz to 2175MHz Frequency Range
    • Monolithic VCO
    • High Dynamic Range: -75dBm to 0dBm

    Type ID Title
    Evaluation Board4791DS3254DK Quad DS3/E3/STS-1 LIU Demo Kit