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

Quality and Environmental Data

Product Reliability Reports: DS32512.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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

Belle Isle 2020
05/29/2020 - 05/31/2020, Detroit, MI
2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.