DS21554LB+

Telecom Overview

The DS21554LB+ is a single-chip transceiver (SCT) designed for E1 line interface applications. It integrates a line interface unit, framer, and HDLC controller to handle PCM-30 and ISDN-PRI protocols. The device operates on a 5V supply and supports data rates of 2.048 Mb/s. It features a 100-pin LQFP package with dimensions of 14mm x 14mm. The operating temperature range extends from -40°C to +85°C. Internal functions include clock/data recovery, jitter attenuation, and elastic store buffers.

Telecom Feature Summary

• Integrated E1 line interface supporting G.703 waveshapes for coaxial and twisted-pair cables
• On-board framer capable of locating frame boundaries and monitoring alarms
• Built-in HDLC controller for Sa-bit links or sub-DSP operations
• Dual two-frame elastic store slip buffers for asynchronous backplane connections

Telecom Applications

• E1 Line Interface Units (LIUs)
• PCM-30 Transceivers
• ISDN-PRI Transceivers

Telecom Procurement Notes

Verify the specific suffix 'LB+' against official Analog Devices documentation to confirm pinout and electrical characteristics. Confirm availability status as discontinued parts may require alternative sourcing strategies. Ensure environmental compliance requirements match project specifications before finalizing procurement.

Telecom Selection Notes

Select this component for designs requiring a complete E1 SCT solution with integrated signaling capabilities. Verify compatibility with existing Intel or Motorola bus architectures. Consider the 5V supply requirement compared to 3.3V alternatives in the same family. Ensure thermal management meets the specified industrial temperature range limits.

Telecom Part Context

This device belongs to the DS21354/DS21554 series of single-chip transceivers. It serves as an upward-compatible version of earlier DS2153 and DS2154 models. The part number indicates a 5V supply variant within the broader product family. It maintains software compatibility with previous generations while adding new features like JTAG support.

Telecom Replacement Considerations

The DS21554LN+ is a verified replacement offering the same functionality with an extended temperature range of -40°C to +85°C. Both devices share identical pinouts and software compatibility.