DS21354L

Telecom Overview

The DS21354L is a single-chip transceiver designed for E1 line interface units. It operates on a 3.3V supply and supports data rates of 1.544 Mb/s. The device integrates clock/data recovery, jitter attenuation, framing, and HDLC control within a 100-pin LQFP package (14mm x 14mm). It functions as an upward-compatible version of the DS2154 SCT, supporting AMI/HDB3 waveforms and G.703 waveshapes for twisted-pair or coaxial cables. Operating temperature range is specified from 0°C to +70°C.

Telecom Feature Summary

• Integrated long- and short-haul line interface with crystal-less jitter attenuation selectable between 32-bit or 128-bit modes.
• Supports FAS, CAS, CCS, and CRC4 frame formats with dual two-frame elastic store slip buffers for asynchronous backplane connections.
• Includes an integral HDLC controller with 64-byte buffers configurable for Sa bits, DS0, or sub-DS0 operation.
• Features an 8-bit parallel control port compatible with Intel or Motorola buses for direct processor access.

Telecom Applications

• E1 Line Interface Units (LIUs)
• PCM-30 and ISDN-PRI Transceivers
• Fractional E1, H0, and H12 Applications

Telecom Procurement Notes

Verify component authenticity through authorized Analog Devices channels. Confirm the specific suffix 'L' indicates the commercial temperature range (0°C to +70°C) versus the industrial 'LN' variant. Check for RoHS compliance documentation and ensure the 100-LQFP package matches the design footprint requirements before finalizing orders.

Telecom Selection Notes

Select the DS21354L specifically for 3.3V applications requiring E1 connectivity. Ensure the system design accommodates the 100-pin LQFP form factor. Verify that the host controller supports the required 8-bit parallel interface protocol. Consider the DS21354LN if the operational environment exceeds the commercial temperature limits defined for this part number.

Telecom Part Context

This component belongs to the DS21354/DS21554 family of Single-Chip Transceivers (SCTs). It serves as a superset upgrade to the legacy DS2153 and DS2154 devices, retaining pin compatibility while adding features like HDLC controllers and interleaving bus operations. The 'L' suffix denotes the commercial temperature grade within the broader product line.

Telecom Replacement Considerations

The DS21354L is pin-compatible with the DS2154, DS2152, DS21352, and DS21552 SCTs. Designers migrating from these older parts can utilize the DS21354L directly without PCB layout changes, provided the power supply voltage aligns with the 3.3V requirement of the DS21354 series.