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

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Status Explanations for product status codes

Part Number Status
DS26303 Active: In Production. See Ordering Information for details.


The DS26303 is an 8-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 termination or external termination. A single bill of material can support E1/T1/J1 with minimum external components. 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.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 1.2MB)
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Errata DS26303 26303A1.pdf
Errata DS26303 26303A2.pdf
Errata DS26303 26303A3.pdf
An evaluation board is available: DS26303DK

Key Features

  • 8 Complete E1, T1, or J1 Short-Haul Line Interface Units
  • Independent E1, T1, or J1 Selections
  • Internal Software-Selectable Transmit and Receive-Side Termination
  • 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 Use
  • Built-In BERT Tester for Diagnostics
  • 8-Bit Parallel Interface Support for Intel or Motorola Mode or a 4-Wire Serial Interface
  • Hardware Mode Interface Support
  • Transmit Short-Circuit Protection
  • G.772 Nonintrusive Monitoring
  • 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
  • 144-Pin eLQFP Package


  • 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

Key Specifications:

T/E Carrier & Packetized Products
Part Number Transmission Standard Functions Channels VSUPPLY
See Notes
DS26303  T1/E1/J1 LIU 8 3.3 $16.48 @1k
See All T/E Carrier & Packetized Products (88)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS26303: Functional Diagram
Functional Diagram

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Information Index

Rev 4; 2007-06-01
This page last modified: 2009-09-22