DS21554LB

Telecom Overview

The DS21554LB is a single-chip transceiver (SCT) designed for E1 line connectivity, operating within a commercial temperature range of 0°C to +70°C. It utilizes a 100-pin LQFP package and requires a 5V supply voltage. The device integrates clock/data recovery circuitry that converts AMI/HDB3 waveforms to an NRZ serial stream, supporting twisted-pair cables up to 2km in length. It features a selectable 32-bit or 128-bit jitter attenuator, an integral HDLC controller with 64-byte buffers, and dual two-frame elastic store slip buffers. The unit supports FAS, CAS, CCS, and CRC4 framing formats and includes a parallel control port for system integration.

Telecom Feature Summary

• Complete E1 PCM-30/ISDN-PRI transceiver functionality with on-board long- and short-haul line interface
• Integral HDLC controller configurable for Sa bits, DS0, or sub-DS0 operation
• Dual two-frame elastic store slip buffers for asynchronous backplane connections
• IEEE 1149.1 JTAG boundary scan architecture for test access

Telecom Applications

• E1 (CEPT) PCM-30 systems
• ISDN-PRI applications
• Telecommunications network interfaces

Telecom Procurement Notes

Verify the specific suffix 'LB' against official documentation, as standard listings typically utilize 'L' or 'LN'. Confirm the 5V power requirement aligns with system design, distinguishing it from the 3.3V DS21354 variant. Ensure the commercial temperature grade meets environmental specifications.

Telecom Selection Notes

Select this component for applications requiring full E1 compliance with integrated jitter attenuation and HDLC capabilities. Verify compatibility with Intel or Motorola bus architectures via the 8-bit parallel control port. Consider the pin-compatible DS2154 if legacy software support is required.

Telecom Part Context

The DS21554 is part of the DS21354/DS21554 family, serving as the 5V supply version of the DS21354. It is an upward-compatible successor to the DS2153 and DS2154 SCTs, retaining original features while adding HDLC controllers and interleaving bus operations.

Telecom Replacement Considerations

Pin-compatible replacements include the DS2154, DS2152, DS21352, and DS21552. Verify supply voltage requirements when substituting the DS21354, as it operates at 3.3V.