3.3V, 16-Channel, E1/T1/J1 Short-Haul Line Interface Unit

3.3V E1/T1/J1 Short-Haul 16-Port Line Interface Unit Provides 16 Independent Receivers and Transmitters in a Single BGA Package

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The DS26324 is a 16-channel short-haul line interface unit (LIU) that supports E1/T1/J1 from a single 3.3V power supply. A wide variety of applications are supported through internal impedance matching. A single bill of material can support E1/T1/J1 that requires no external termination. Redundancy is supported through nonintrusive monitoring, optimal high-impedance modes and configurable 1:1 or 1+1 backup enhancements. An on-chip synthesizer generates the E1/T1/J1 clock rates by a single master clock input of various frequencies. Two clock output references are also offered. The device is offered in a 256-pin TE-CSBGA, the smallest package available for a 16-channel LIU.
DS26324: Functional Diagram DS26324: Functional Diagram Enlarge+

Key Features

  • 16 E1, T1, or J1 Short-Haul Line Interface Units
  • Independent E1, T1 or J1 Selections
  • Fully Internal Impedance Match Requires No External Resistors
  • Software-Selectable Transmit and Receive-Side Impedance Match
  • Crystal-Less Jitter Attenuator
  • Selectable Single-Rail and Dual-Rail Mode and AMI or HDB3/B8ZS Line Encoding and Decoding
  • Detection and Generation of AIS
  • Digital/Analog Loss of Signal Detection as per T1.231, G.775 and ETS 300 233
  • External Master Clock Can Be Multiple of 2.048MHz or 1.544MHz for T1/J1 or E1 Operation; This Clock Will Be Internally Adapted for T1 or E1 Usage
  • Receiver Signal Level Indicator from -2.5dB to -20dB in 2.5dB Increments
  • Two Built-In BERT Testers for Diagnostics
  • 8-Bit Parallel Interface Support for Intel or Motorola Mode or a 4-Wire Serial Interface
  • Transmit Short-Circuit Protection
  • G.772 Nonintrusive Monitoring
  • Receive Monitor Mode Handles Combinations of 14dB to 20dB of Resistive Attenuation Along with 12dB to 30dB of Cable Attenuation
  • Specification Compliance to the Latest T1 and E1 Standards—ANSI T1.102, AT&T Pub 62411, T1.231, T1.403, ITU-T G.703, G.742, G.775, G.823, ETS 300 166, and ETS 300 233
  • Single 3.3V Supply with 5V Tolerant I/O
  • JTAG Boundary Scan as Per IEEE 1149.1


  • ATM and Frame Relay Equipment
  • E1/T1/J1 LAN/WAN Routers
  • E1/T1/J1 Multiplexer and Channel Banks
  • ISDN Primary Rate Interface
  • T1 Digital Cross-Connects
  • Wireless Base Stations

Technical Documents

App Note 3619 DS26334 and DS26324 Transmit Pulse Control

Additional Resources

Design Kit: DS26324DK
Product Reliability Reports: DS26324.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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