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


The XRT83VSH316 is a fully integrated 16-channel short-haul line interface unit (LIU) that operates from a 1.8V Inner Core and 3.3V I/O power supplies. Using internal termination, the LIU provides one bill of materials to operate in T1, E1, or J1 mode independently on a per channel basis with minimum external components. The LIU features are programmed through a standard parallel microprocessor interface or SPI (Serial Mode). EXAR's LIU has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the LIU is powered off. Key design features within the LIU optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays.

The on-chip clock synthesizer generates T1/E1/J1 clock rates from a selectable external clock frequency and has five output clock references that can be used for external timing (8kHz, 1.544Mhz, 2.048Mhz, nxT1/J1, nxE1). Additional features include System Side LOS, AIS, QRSS/PRBS and Line Side RLOS, AIS, QRSS/ PRBS, DMO with 16-bit LCV counters and diagnostic loopback modes for each channel.

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  • Fully integrated 16-Channel short haul transceivers for T1/J1 (1.544MHz) and E1 (2.048MHz) applications
  • Parallel or SPI Microprocessor Interface
  • T1/E1/J1 short haul and clock rate are per port selectable through software without changing components
  • Internal Impedance matching on both receive and transmit for 75Ω (E1), 100Ω (T1), 110Ω (J1), and 120Ω (E1) applications are per port selectable through software without changing components
  • Power down on a per channel basis with independent receive and transmit selection
  • Five pre-programmed transmit pulse settings for T1 short haul applications per channel
  • User programable Arbitrary Pulse mode for T1 and E1
  • On-Chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel basis
  • Crystal-Less digital jitter attenuators (JA) with 32-Bit or 64-Bit FIFO for the receive or transmit path per channel
  • Driver failure monitor output (DMO) alerts of possible system or external component problems
  • Transmit outputs and receive inputs may be High impedance for protection or redundancy applications on a per channel basis
  • Support for automatic protection switching
  • 1:1 and 1+1 protection without relays
  • Receive monitor mode handles 0 to 6dB resistive attenuation (flat loss) along with 0 to 6dB cable loss for both T1 and E1
  • Loss of signal (LOS) according to ITU-T G.775/ETS300233 (E1) and ANSI T1.403 (T1/J1) for system (SLOS) and line (RLOS) side diagnostics
  • Programmable data stream muting upon RLOS detection
  • On-Chip HDB3/B8ZS encoder/decoder with an internal 16-bit LCV counter for each channel
  • On-Chip digital clock recovery circuit for high input jitter tolerance
  • QRSS/PRBS pattern generator and detection for testing and monitoring for system (SPRBS) and line (PRBS) side diagnostics
  • Error and bipolar violation insertion and detection
  • Transmit all ones (TAOS) Generators and Detectors for system (SAIS) and line (AIS) side diagnostics
  • Supports local analog, remote, digital, and dual loopback modes
  • Supports gapped clocks for mapper/multiplexer applications
  • 1.8V Digital Core
  • 3.3V I/O and Analog Core
  • 316-Pin STBGA package
  • -40°C to +85°C Temperature Range
  • Pb-Free, RoHS Compliant Versions Offered


  • T1 Digital Cross Connects (DSX-1)
  • ISDN Primary Rate Interface
  • CSU/DSU E1/T1/J1 Interface
  • T1/E1/J1 LAN/WAN Routers
  • Public Switching Systems and PBX Interfaces
  • T1/E1/J1 Multiplexer and Channel Banks
  • Integrated Multi-Service Access Platforms (IMAPs)
  • Integrated Access Devices (IADs)
  • Inverse Multiplexing for ATM (IMA)
  • Wireless Base Stations

Design Tools

Simulation Models
Evaluation Hardware and Software
Technical Library


Pkg Code Details Quantities Dimensions PDF

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XRT83VSH316IB -40 85 OBS Suggested:
XRT83VSH316IB-F STBGA316 -40 85 Active
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Distribution Date Description File
04/29/2015 Product discontinuation notification PDN_14-1250-03-1033.pdf
07/18/2014 Material Change. UTAC qualification to use mold compound KSG1250LKDS, in addition to current qualified mold compound KMC2520AL. PCN_14-0311-01-1033.pdf
07/14/2014 Material Change. UTAC qualification to use mold compound KEG1250LKDS, in addition to current qualified mold compound KMC2520AL. PCN_14-0311-01a-1033.pdf
09/18/2009 Pin “SDO/D0” (Ball Y5) will stay at High-Z when Pin “SER_PARB” (Ball T17) is pulled “High” and chip is not selected. Metal-2 layer is changed to implement the fix. Certain applications require SDO/D0 pin to be at high-Z when the device is not selected. PCN_090806-01-1033.pdf