Analog Devices Inc./Maxim Integrated DS2155GNC2

Overview

DS2155GNC2 from Maxim Integrated is a software-selectable T1/E1/J1 single-chip transceiver (SCT) integrating line interface unit (LIU), framer, dual HDLC controllers, and TDM backplane interface. It supports long-haul and short-haul operation with programmable 75Ω/100Ω/120Ω termination, CMI coding, and crystal-less jitter attenuation. Used in telecom line cards for synchronous TDM transport over copper.

For engineers reviewing the DS2155GNC2 datasheet, DS2155GNC2 pinout, DS2155GNC2 application, or DS2155GNC2 equivalent, key selection criteria include T1/E1/J1 protocol flexibility, dual HDLC channel support, software-configurable termination, jitter-attenuated clock recovery, and 100-ball CSBGA packaging for high-density line card designs.

Technical Context

The DS2155GNC2 implements independent transmit and receive paths with full T1 (1.544 Mbps), E1 (2.048 Mbps), and J1 (1.544 Mbps) framing and line coding compliance. Its LIU provides G.703-compliant waveshaping for 75Ω coax and 120Ω twisted-pair, plus DSX-1/CSU line buildouts up to –22.5 dB.

It features dual elastic-store slip buffers supporting asynchronous backplane interfaces up to 16.384 MHz, programmable BERT generator/detector, and internal clock synthesis locked to recovered network timing - enabling stable TDM interconnect without external crystal.

Key Specifications

Pinout & Package

DS2155GNC2 is housed in a 100-ball CSBGA (Chip Scale Ball Grid Array) package measuring 10 mm × 10 mm with 0.8 mm ball pitch. The package supports fine-pitch routing and thermal performance suitable for dense telecom line card layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar T1/E1 transceiver applications.

Compared with DS2155GNC2, DS2156LN+ offers enhanced thermal robustness and updated silicon revision, while MC2021A trades protocol versatility and integrated HDLC for lower unit cost and simpler design - making DS2155GNC2 optimal for multi-standard, feature-rich telecom line cards.

Availability

DS2155GNC2 is available at Aetrix Electronics and suitable for T1/E1 line cards, telecom switches and routers, add-drop multiplexers, and ISDN-PRI gateways requiring stable component supply across extended lifecycle programs.

Supply support for DS2155GNC2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for industrial, communications, and computing applications.

The DS2155 product line delivers fully integrated T1/E1/J1 transceivers targeting telecom infrastructure equipment where protocol flexibility, jitter resilience, and compact footprint are critical design constraints.

FAQ

What protocols does the DS2155GNC2 support?

The DS2155GNC2 supports T1 (1.544 Mbps), E1 (2.048 Mbps), and J1 (1.544 Mbps) protocols in a single device via software configuration. It complies with G.703 for E1 physical layer, DSX-1/CSU line buildouts for T1, and ITU-T Q.931 for ISDN-PRI signaling. All protocol modes share the same pinout and register map, enabling firmware-driven deployment across regional networks without hardware changes. The DS2155GNC2 does not support T3, STM-1, or packet-based interfaces like Ethernet or SONET.

Does DS2155GNC2 require an external crystal?

No, the DS2155GNC2 incorporates a crystal-less jitter attenuator that locks to the incoming network clock using an internal PLL. This eliminates the need for an external crystal oscillator, reducing bill-of-materials cost and PCB area. The device synthesizes stable backplane clocks (16.384 MHz, 8.192 MHz, etc.) directly from the recovered network timing, ensuring phase coherence across TDM stages. An optional crystal may be used for free-running test modes, but it is not required for normal operation of the DS2155GNC2.

What is the package type and thermal specification of DS2155GNC2?

The DS2155GNC2 uses a 100-ball CSBGA (Chip Scale Ball Grid Array) package measuring 10 mm × 10 mm with 0.8 mm ball pitch. It is rated for operation from –40°C to +85°C ambient temperature, making it suitable for industrial and outdoor telecom enclosures. The package features exposed thermal pad for enhanced heat dissipation and meets JEDEC J-STD-020 moisture sensitivity level 3. This specification applies specifically to the DS2155GNC2 variant - other suffixes (e.g., DS2155L) use LQFP packages with different thermal profiles.

How does DS2155GNC2 handle line termination impedance?

The DS2155GNC2 integrates programmable termination resistors on both transmit and receive sides, selectable via internal registers for 75Ω (coaxial), 100Ω (PCB trace), or 120Ω (twisted-pair) configurations. This eliminates external resistor networks and allows dynamic reconfiguration during operation - for example, switching from E1 120Ω to T1 100Ω mode without hardware modification. Termination settings apply independently per channel and are validated per G.703 Annex A and GR-499-CORE specifications for the DS2155GNC2.

Can DS2155GNC2 operate in both long-haul and short-haul modes?

Yes, the DS2155GNC2 supports both long-haul and short-haul operation through configurable line buildout levels. For T1, it provides DSX-1 and CSU line buildouts of –7.5 dB, –15 dB, and –22.5 dB to match varying cable loss characteristics. For E1, it generates G.703-compliant waveshapes optimized for 75Ω coax (long-haul) and 120Ω twisted-pair (short-haul). These settings are software-controlled and verified per ITU-T G.703 and Telcordia GR-499-CORE for the DS2155GNC2.