DS21554L+

Telecom Overview

The DS21554L+ is a single-chip transceiver (SCT) designed for E1 line interface applications. It operates on a 5V supply and supports data rates of 2.048 Mb/s. The device integrates a line interface unit, framer, HDLC controller, and elastic stores within a 100-pin LQFP package measuring 14mm x 14mm. It functions as an upward-compatible version of the DS2154 SCT, featuring on-board clock/data recovery and jitter attenuation. The component meets ITU-T G.703, G.704, and G.706 specifications.

Telecom Feature Summary

• Complete E1 PCM-30/ISDN-PRI transceiver functionality with independent transmit and receive paths
• On-board long- and short-haul line interface supporting 75Ω coaxial and 120Ω twisted-pair cables
• Integrated HDLC controller with 64-byte buffers configurable for Sa bits or DS0 operations
• Dual two-frame elastic store slip buffers connecting to asynchronous backplanes up to 8.192MHz

Telecom Applications

• E1 Line Interface Units (LIUs)
• Telecommunications network equipment
• PCM multiplexing systems

Telecom Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm RoHS compliance status and check for specific manufacturing lot codes relevant to your assembly requirements. Ensure proper handling procedures are followed due to moisture sensitivity classification.

Telecom Selection Notes

Select this component when a 5V supply is required for E1 transceiver applications. It serves as a direct replacement for the DS2154 in designs needing upward compatibility. Verify that the 100-pin LQFP package fits the PCB layout constraints and thermal management requirements of the target system.

Telecom Part Context

This part belongs to the DS21354/DS21554 family of 3.3V/5V E1 Single-Chip Transceivers manufactured by Analog Devices Inc./Maxim Integrated. It is functionally similar to the DS2154 but offers enhanced features such as interleaving PCM bus operation and JTAG boundary scan architecture.

Telecom Replacement Considerations

The DS21554L is a pin-compatible alternative within the same series. Designers should verify software compatibility and register configurations when migrating between these variants.