DS2156LN

Telecom Overview

The DS2156LN is a software-selectable T1, E1, or J1 single-chip transceiver designed for short-haul and long-haul telecommunications applications. It integrates a line interface unit (LIU), framer, HDLC controllers, and a UTOPIA/TDM backplane interface. The device supports user-configurable TDM or UTOPIA II bus interfaces and operates with a supply voltage range of 3.135 V to 3.465 V. It functions within an operating temperature range of -40°C to +85°C and is housed in a 100-lead LQFP package.

Telecom Feature Summary

• Supports complete T1/DS1/ISDN-PRI/J1 and E1 (CEPT) PCM-30/ISDN-PRI transceiver functionality
• Features a crystal-less jitter attenuator and independent transmit/receive paths
• Includes dual HDLC controllers and programmable BERT generator/detector
• Provides internal software-selectable termination resistors for 75Ω, 100Ω, and 120Ω interfaces

Telecom Applications

• Inverse Multiplexing for ATM (IMA)
• T1/E1/J1 Line Cards
• Switches and Routers
• Add-Drop Multiplexers

Telecom Procurement Notes

Verify component authenticity through authorized Analog Devices channels due to discontinuation status. Confirm package integrity and moisture sensitivity handling procedures before assembly. Review official product discontinuance notices for end-of-life timelines and last-time buy information to ensure supply chain stability for existing designs.

Telecom Selection Notes

Select this component for designs requiring pin and software compatibility with the DS2155 series. Ensure the application utilizes the specified 3.3V power domain and requires the 100-lead LQFP form factor. Validate that the system architecture supports the required TDM or UTOPIA II backplane interface configurations for proper data synchronization.

Telecom Part Context

This part belongs to the Maxim Integrated DS2156 family of telecom interface ICs, now managed by Analog Devices following the 2021 acquisition. The DS2156LN variant specifically denotes the industrial temperature grade (-40°C to +85°C) version of the standard commercial DS2156L+, offering enhanced environmental robustness for broader deployment scenarios.

Telecom Replacement Considerations

The DS2156LN is functionally compatible with the DS2155LN and DS2156L+ regarding pinout and software control. Designers should verify specific thermal characteristics and packaging tolerances when substituting between these variants to ensure mechanical fit and electrical performance alignment.