DS2155LNB+

Telecom Overview

The DS2155LNB+ is a software-selectable T1, E1, or J1 single-chip transceiver designed for short-haul and long-haul applications. It integrates a line interface unit (LIU), framer, HDLC controllers, and a TDM backplane interface controlled by an 8-bit parallel port supporting Intel or Motorola bus operations. The device operates within a supply voltage range of 3.135 V to 3.465 V with a typical operating current of 75 mA. It supports data rates up to 64 kb/s and functions within a commercial temperature range of 0°C to +70°C. The component is housed in a 100-pin LQFP package.

Telecom Feature Summary

• Complete T1/DS1/ISDN-PRI/J1 and E1 (CEPT) PCM-30/ISDN-PRI transceiver functionality
• Long-haul and short-haul line interface with crystal-less jitter attenuator
• Dual HDLC controllers and programmable BERT generator/detector
• Internal software-selectable termination resistors for 75Ω, 100Ω, and 120Ω interfaces

Telecom Applications

• T1/E1/J1 Line Cards
• Switches and Routers
• Add-Drop Multiplexers

Telecom Procurement Notes

Verify the specific ordering suffix against official documentation to confirm the exact temperature range and compliance status. The 'LN' suffix indicates an industrial temperature rating (-40°C to +85°C), while the '+' denotes lead-free/RoHS-compliant packaging. Confirm availability through authorized distributors as this component may be subject to discontinuation notices.

Telecom Selection Notes

Select the DS2155LNB+ when both T1 and E1 protocol support is required on a single channel. Ensure the design accommodates the 100-pin LQFP footprint and provides the necessary 3.3V power supply rails. Verify that the host processor can interface with the 8-bit parallel control port using either Intel or Motorola bus protocols.

Telecom Part Context

This component belongs to the Maxim Integrated DS2155 family of telecom interface ICs. It serves as a versatile solution for digital carrier systems, offering pin and software compatibility with the DS2156 model. The device consolidates multiple discrete functions into one integrated circuit to reduce board space and system complexity.

Telecom Replacement Considerations

The DS2155LNB+ is pin and software compatible with the DS2156. Designers should verify if the DS2156 meets all functional requirements before substitution.