T1 Single Chip Transceiver

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Status Explanations for product status codes

Part Number Status Replacement Explanation
DS2151Q Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.DS26521
Please upgrade to the DS26521 for newer technology, smaller package, lower cost, and lower power consumption. 


The DS2151Q is a first-generation line interface unit for T1 lines that that pioneered single-chip integration of multiple functions, combining long- and short-haul and framing functionality with dual elastic stores and an 8-bit parallel control port. It continues to provide an adaptable interface unit at both network and central office interfaces.

The DS2151Q meets T1 specifications, including ANSI T1 403-199X, AT&T TR 6241 (12-90), and ITU G.703, G.704 G.706, G.823, and 1.431. Under processor control, the user can access the 64 8-bit internal registers to configure the DS2152 to suit the application.

Data Sheet

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Key Features

  • Complete DS1/ISDN-PR1 transceiver
  • Short- and long-haul trunk capability
  • Independent send and receive functions
  • 32-bit or 128-bit jitter attenuator
  • DSX-1 and CXU line build-outs
  • D4, ESF, and SLC-96R framing
  • Dual onboard elastic buffers connect to backplanes up to 8.192MHz
  • Programmable output clocks for Fractional T1
  • 8-bit parallel control port can be muxed or nonmuxed
  • Extracts/inserts robbed-bit signals
  • Detects/generates yellow and blue alarms
  • Onboard FDL support circuitry
  • Generates/detects CSU loop codes
  • ANSI one's density monitor/enforcer
  • Path and line error counters, including BPV, CV, CRC6, and framing bit errors
  • Pin-compatible with DS2153Q
  • Operating ranges:
    • 5.0V
    • 0°C to +70°C (DS2151Q)
    • -40°C to +85°C (DS2151QN)


DS2151Q: Pin Configuration
Pin Configuration

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Rev 2; 2006-01-23
This page last modified: 2009-10-23