Analog Devices Inc./Maxim Integrated DS2155G

Overview

DS2155G 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 operates across 0°C to +70°C, supports 75Ω/120Ω media, delivers CMI coding, crystal-less jitter attenuation, and features internal programmable termination resistors for T1/E1 interfaces.

For engineers reviewing the DS2155G datasheet, DS2155G pinout, DS2155G application, or DS2155G equivalent, key selection criteria include long/short-haul line interface capability, dual elastic-store slip buffers for asynchronous backplanes up to 16.384MHz, software-configurable bus interface (Intel/Motorola), and integrated BERT generator/detector for loop testing.

Technical Context

The DS2155G implements independent transmit and receive paths with full T1 (DS1), E1 (CEPT PCM-30), and J1 compatibility. Its LIU provides G.703-compliant waveshaping for 75Ω coax and 120Ω twisted-pair, plus DSX-1 and CSU line buildouts (-7.5dB, -15dB, -22.5dB) for T1.

It synthesizes backplane clocks at 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz locked to recovered network clock, and uses dual two-frame elastic-store buffers to absorb timing misalignment between network and backplane domains.

Key Specifications

Pinout & Package

DS2155G is housed in a 100-ball Chip Scale Ball Grid Array (CSBGA) package with 0.5mm pitch and 10mm × 10mm body size per Maxim's package drawing 56-G6008-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2155G, DS2155L offers identical functionality in LQFP for easier prototyping and thermal monitoring, while DS2155LN extends temperature range to -40°C to +85°C without altering pinout or software interface - both retain full T1/E1/J1 feature set and register compatibility.

Availability

DS2155G is available at Aetrix Electronics and suitable for T1/E1 line cards, switches and routers, add-drop multiplexers, and ISDN-PRI gateways requiring stable component supply across commercial temperature range.

Supply support for DS2155G 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) designs high-performance analog and mixed-signal ICs for communications, computing, and industrial applications.

The DS2155G belongs to Maxim's T1/E1/J1 single-chip transceiver product line, engineered for carrier-class telecom infrastructure where integration, jitter performance, and software configurability reduce system design complexity.

FAQ

What is the operating temperature range for the DS2155G?

The DS2155G is specified for operation from 0°C to +70°C. This commercial-grade temperature range suits indoor telecom equipment such as central office line cards, enterprise routers, and ISDN gateways where ambient conditions remain controlled. The DS2155G uses a 100-ball CSBGA package optimized for thermal performance within this range. For extended environments, the DS2155GN variant supports -40°C to +85°C.

Does the DS2155G support both T1 and E1 standards simultaneously?

No - the DS2155G operates in either T1, E1, or J1 mode at any given time, selected via software configuration during initialization. Its registers and internal logic adapt fully to the chosen standard, including framing, line buildout, and signaling protocols. However, it cannot process T1 and E1 traffic concurrently on the same instance; separate devices or time-multiplexed operation is required for multi-standard systems.

What package type does the DS2155G use, and how does it differ from the DS2155L?

The DS2155G uses a 100-ball Chip Scale Ball Grid Array (CSBGA) package with 0.5mm pitch and 10mm × 10mm footprint. In contrast, the DS2155L uses a 100-pin LQFP package with gull-wing leads. Both share identical pin functions and register maps, but the CSBGA offers higher I/O density and improved high-frequency signal integrity, while the LQFP simplifies manual soldering and thermal monitoring via its exposed pad.

Is the DS2155G pin-compatible with the DS2156?

Yes - the DS2155G is pin and software compatible with the DS2156, as confirmed in Maxim's datasheet General Description section. This allows direct replacement in existing designs using the DS2156, provided the DS2155G's temperature range (0°C to +70°C) and package (CSBGA) meet system requirements. No PCB layout changes are needed, and firmware remains fully reusable.

What clock synthesis capabilities does the DS2155G provide for backplane interfaces?

The DS2155G synthesizes four independent backplane clock outputs (CLKOUT[3:0]) at 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz, all phase-locked to the recovered network clock. This eliminates need for external clock generators and ensures synchronous TDM data transfer between the DS2155G and downstream ASICs or FPGAs, even under network clock drift or jitter conditions.