E1 Quad Transceiver

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Status Explanations for product status codes

Part Number Status
DS21Q59 Active: In Production. See Ordering Information for details.


The DS21Q59 E1 quad transceiver contains all the necessary functions for connecting to four E1 lines. The DS21Q59 is a direct replacement for the DS21Q50, with the addition of signaling access and improved interrupt handling. It is composed of a line interface unit, framer, and a TDM backplane interface, and is controlled through an 8-bit parallel port configured for Intel or Motorola bus operations or serial port operation.

Data Sheet

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Errata DS21Q59 21Q59A1.pdf

Key Features

  • Four Complete E1 (CEPT) PCM-30/ISDN-PRI Transceivers
  • Pin Compatible with the DS21Q50
  • Long-Haul and Short-Haul Line Interfaces
  • 32-Bit or 128-Bit Crystal-Less Jitter Attenuator
  • Frames to FAS, CAS, and CRC4 Formats
  • CAS/CCS Signaling Support
  • 4MHz/8MHz/16MHz Clock Synthesizer
  • Flexible System Clock with Automatic Source Switching on Loss-of-Clock Source
  • Two-Frame Elastic-Store Slip Buffer on the Receive Side
  • Interleaving PCM Bus Operation Up to 16.384MHz
  • Configurable Parallel and Serial Port Operation
  • Detects and Generates Remote and AIS Alarms
  • Fully Independent Transmit and Receive Functionality
  • Four Separate Loopback Functions
  • PRBS Generation/Detection/Error Counting
  • 3.3V Low-Power CMOS
  • Large Counters for Bipolar and Code Violations, CRC4 Codeword Errors, FAS Word Errors, and E Bits
  • Eight Additional User-Configurable Output Pins
  • 100-Pin (14mm) LQFP Package


  • DSLAM Backplane
  • IMA and WAN Equipment
  • Routers/Switches

Key Specifications:

T/E Carrier & Packetized Products
Part Number Transmission Standard Functions Channels VSUPPLY
See Notes
DS21Q59  E1 Framer + LIU 4 3.3 $30.72 @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.


DS21Q59: Block Diagram
Block Diagram

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Information Index

Document Ref.: xxx Rev 1; 2004-09-03
This page last modified: 2009-10-13