T1/E1/J1/64KCC BITS Element

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Status Explanations for product status codes

Part Number Status
DS26504 Active: In Production. See Ordering Information for details.


The DS26504 is a building-integrated timing-supply (BITS) clock-recovery element. It also functions as a basic T1/E1 transceiver. The receiver portion can recover a clock from T1, E1, 64kHz composite clock (64KCC), and 6312kHz synchronization timing interfaces. In T1 and E1 modes, the Synchronization Status Message (SSM) can also be recovered. The transmit portion can directly interface to T1, E1, or 64KCC synchronization interfaces as well as source the SSM in T1 and E1 modes. The DS26504 can translate between any of the supported inbound synchronization clock rates to any supported outbound rate. The DS26504 can also accept an 8kHz as well as a 19.44MHz reference clock. A separate output is provided to source a 6312kHz clock. The device is controlled through a parallel, serial, or hardware controller port.

Data Sheet

Download this datasheet in PDF formatDownload Rev 8 (PDF, 3.2MB)
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Errata DS26504 26504A1.pdf
Errata DS26504 26504B2.pdf
An evaluation board is available: DS26504DK

Key Features

  • Transmit and Receive T1 BOC SSM Messages with Receive Message Change of State and Validation Indication
  • Transmit and Receive E1 Sa(n) Bit SSM Messages with Receive Message Change of State Indication
  • Crystal-Less Jitter Attenuator with Bypass Mode for T1 and E1 Operation
  • Fully Independent Transmit and Receive Functionality
  • Internal Software-Selectable Receive and Transmit Side Termination for 75Ω/100Ω/110Ω/120Ω/133Ω
  • Monitor Mode for Bridging Applications
  • Accepts 16.384MHz, 12.8MHz, 8.192MHz, 4.096MHz, 2.048MHz, or 1.544MHz Master Clock
  • 64kHz, 8kHz, and 400Hz Outputs in Composite Clock Mode
  • 8-Bit Parallel Control Port, Multiplexed or Nonmultiplexed, Intel or Motorola
  • Serial (SPI) Control Port and Hardware Control Mode
  • Provides LOS, AIS, and LOF Indications through Hardware Output Pins
  • Fast Transmitter Output Disable through Device Pin for Protection Switching
  • IEEE 1149.1 JTAG Boundary Scan
  • 3.3V Supply with 5V Tolerant Inputs and Outputs
  • Pin and Software Compatible with the DS26502 and DS26503


  • BITS Timing
  • Rate Conversion

Key Specifications:

T/E Carrier & Packetized Products
Part Number Transmission Standard Functions Channels In-to-Out Clocks
See Notes
64kHz Composite Clock - G.703 Level B
64kHz - G.703 II.1 Japanese 64kHz Clock
64kHz Composite Clock - GR378
64kHz - G.703 II.2 Japanese 6312kHz Clock
64kHz Composite Clock - G.703 Level A
BITS Element 1
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.


DS26504: Block Diagram
Block Diagram

More Information

New Product Press Release   2005-07-22 ]

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Rev 8; 2008-08-01
This page last modified: 2009-10-06