DS21448LN+

Telecom Overview

The DS21448LN+ is a quad-port E1/T1/J1 line interface unit (LIU) manufactured by Analog Devices Inc./Maxim Integrated. It integrates four independent transmitters and receivers within a single 128-pin LQFP package, designed for short-haul and long-haul applications. The device operates on a 3.3V power supply with a minimum voltage of 3.135V and a maximum of 3.465V. It supports an operating temperature range from -40°C to +85°C. Key electrical parameters include internal software-selectable receive-side termination for 75Ω/100Ω/120Ω impedances and a crystal-less jitter attenuator requiring only a 2.048MHz master clock.

Telecom Feature Summary

• Integrates four complete E1, T1, or J1 line interface units with independent transmitters and receivers.
• Supports both long-haul and short-haul trunks with programmable line build-outs.
• Features a crystal-less jitter attenuator that requires only a 2.048MHz master clock.
• Includes AMI, HDB3, and B8ZS encoding/decoding capabilities.

Telecom Applications

• Integrated multiservice access platforms
• T1/E1 cross-connects, multiplexers, and channel banks
• Central-office switches and PBX interfaces
• T1/E1 LAN/WAN routers
• Wireless base stations

Telecom Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific revision level against current errata documentation, as multiple revisions may be available simultaneously. Ensure the ordering suffix matches the required temperature range and package type. Check for lead-free/RoHS compliance status if environmental regulations apply to your deployment.

Telecom Selection Notes

Select the DS21448LN+ when a quad-port solution in a 128-pin LQFP package is required for industrial or extended temperature environments ranging from -40°C to +85°C. This model provides the necessary interface flexibility for E1, T1, and J1 protocols without external crystals. Consider alternative packages like the 144-pin PBGA if board space constraints favor a different footprint or thermal profile.

Telecom Part Context

The DS21448LN+ belongs to the DS21448 family of telecom interface ICs produced by Analog Devices Inc./Maxim Integrated. It serves as a specialized line interface unit designed to handle high-speed digital telecommunication signals. The component is part of a broader portfolio of LIUs that support various international communication standards, facilitating integration into complex network infrastructure equipment.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material. Consult official manufacturer documentation for potential obsolescence notices or recommended upgrades.