DS26504LN+T&R

Telecom Overview

The DS26504LN+T&R is a building-integrated timing-supply (BITS) clock-recovery element and basic T1/E1 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within an industrial temperature range of -40°C to +85°C and is housed in a 64-pin, 10mm x 10mm LQFP package. The device accepts reference clocks of 8kHz or 19.44MHz, alongside standard T1, E1, and 64kHz composite clock inputs. It supports master clock frequencies of 16.384MHz, 12.8MHz, 8.192MHz, 4.096MHz, 2.048MHz, or 1.544MHz. The component provides 3.3V supply operation with 5V tolerant I/O and includes IEEE 1149.1 JTAG boundary scan capabilities.

Telecom Feature Summary

• Supports crystal-less jitter attenuation for T1 and E1 modes with a bypass option.
• Features fully independent transmit and receive functionality with internal software-selectable termination for various line impedances.
• Provides comprehensive synchronization status message handling for both T1 BOC and E1 Sa(n) bit formats.
• Includes hardware control mode and fast transmitter output disable for protection switching applications.

Telecom Applications

• Building-Integrated Timing-Supply (BITS) timing systems
• Telecommunications rate conversion between different synchronization interfaces
• Short-haul and long-haul T1/E1 line interface circuits

Telecom Procurement Notes

Verify the specific suffix 'T&R' against official documentation to confirm tape-and-reel packaging requirements. Confirm that the LN variant meets the required -40°C to +85°C operating temperature range for your deployment environment. Ensure compatibility with existing 3.3V power rails and 5V tolerant logic levels before finalizing procurement.

Telecom Selection Notes

Select this component when a combined BITS clock recovery and T1/E1 transceiver function is required. Verify support for specific synchronization standards such as GR378 and G.703 compliance. Consider the availability of driver source code from the manufacturer if custom firmware integration is planned. Evaluate the need for JTAG boundary scan testing during the design phase.

Telecom Part Context

This part belongs to the DS26504 family of telecommunications interface ICs. It shares pin and software compatibility with the DS26502 and DS26503 models. The device serves as a foundational element for network synchronization infrastructure, bridging various clock rates and providing essential framing and transmission capabilities for digital carrier networks.

Telecom Replacement Considerations

The DS26502 and DS26503 are confirmed pin and software compatible replacements within the same product family. Verify that any substitute maintains the required industrial temperature rating (-40°C to +85°C) and 64-pin LQFP package dimensions to ensure mechanical fit without PCB redesign.

Telecom FAQ

What types of reference clocks does the DS26504 accept?

The device accepts 8kHz and 19.44MHz reference clocks, in addition to T1, E1, and 64kHz composite clock inputs.

Does the DS26504 support CMI-coded interfaces?

Yes, the device supports interface to CMI-coded T1/J1 and E1 signals.

How is the internal termination configured?

Internal termination is software-selectable for 75Ω, 100Ω, 110Ω, 120Ω, and 133Ω lines on both the transmit and receive sides.