6-/8-/12-Port DS3/E3/STS-1 LIU

Less than 170mW/Port in a Small, 23mm x 23mm BGA

Please check latest availability status for a specific part variant.


The DS32506 (6 port), DS32508 (8 port), and DS32512 (12 port) line interface units (LIUs) are highly integrated, low-power, feature-rich LIUs for DS3, E3, and STS-1 applications. Each LIU port in these devices has independent receive and transmit paths, a jitter attenuator, full-featured pattern generator and detector, performance-monitoring counters, and a complete set of loopbacks. An on-chip clock adapter generates all line-rate clocks from a single input clock. Ports are independently software configurable for DS3, E3, and STS-1 and can be individually powered down. Control interface options include 8-bit parallel, SPI™, and hardware mode.
DS32506, DS32508, DS32512: Typical Operating Circuit DS32506, DS32508, DS32512: Typical Operating Circuit Enlarge+

Key Features

  • Pin-Compatible Family of Products
  • Each Port Independently Configurable
  • Receive Clock and Data Recovery for Up to 457 meters (1500 feet) of 75Ω Coaxial Cable
  • Standards-Compliant Transmit Waveshaping
  • Uses 1:1 Transformers on Both Tx and Rx
  • Three Control Interface Options: 8/16-Bit Parallel, SPI, and Hardware Mode
  • Jitter Attenuators (One Per Port) Can be Placed in the Receive Path or the Transmit Path
  • 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, 12.8MHz, 19.44MHz, 38.88MHz, 77.76MHz)
  • Per-Port Programmable Internal Line Termination Requiring Only External Transformers
  • High-Impedance Tx and Rx, Even When VDD = 0, Enables Hot-Swappable, 1:1 and 1+1 Board Redundancy Without Relays
  • Per-Port BERT for PRBS and Repetitive Pattern Generation and Detection
  • Tx and Rx Open and Short Detection Circuitry
  • Transmit Driver Monitor Circuitry
  • Receive Loss-of-Signal (LOS) Monitoring Compliant with ANSI T1.231 and ITU G.775
  • Automatic Data Squelching on Receive LOS
  • Large Line Code Performance-Monitoring Counters for Accumulation Intervals Up to 1s
  • Local and Remote Loopbacks
  • Transmit Common Clock Option
  • Power-Down Capability for Unused Ports
  • Low-Power 1.8V/3.3V Operation (5V Tolerant I/O)
  • Industrial Temperature Range: -40°C to +85°C
  • Small Package: 23mm x 23mm, 484-Pin BGA
  • IEEE 1149.1 JTAG Support


  • Access Concentrators
  • ATM and Frame Relay Equipment
  • CSUs/DSUs
  • Digital Cross-Connects
  • DSLAMs
  • PBXs
  • SONET/SDH and PDH Multiplexers
Product Reliability Reports: DS32508.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.

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