Analog Devices Inc./Maxim Integrated DS3254N+

Overview

DS3254N+ from Maxim Integrated (now Analog Devices) is a quad-line interface unit (LIU) for DS3/E3/STS-1 physical-layer interfacing in telecom infrastructure. It integrates four independent receive/transmit paths, on-chip jitter attenuators with 16/32/64/128-bit provisionable FIFO depth, and a clock adapter synthesizing line-rate clocks (DS3: 44.736MHz, E3: 34.368MHz, STS-1: 51.84MHz) from a single input (e.g., 19.44MHz). It supports B3ZS/HDB3 encoding/decoding and operates over -40°C to +85°C in a 144-pin thermally enhanced CSBGA package.

For engineers reviewing the DS3254N+ datasheet, DS3254N+ pinout, DS3254N+ application, or DS3254N+ equivalent, key selection considerations include per-port configurability, jitter attenuation placement flexibility (RX/TX path or disabled), 3.3V low-power operation with 5V-tolerant I/O, hardware/parallel/SPI control interface options, and compliance with ANSI T1.102, ITU G.703/G.823/G.824, and Telcordia GR-253.

Technical Context

The DS3254N+ implements four fully independent LIU channels, each with separate AGC/equalizer (0–15dB loss compensation), clock-and-data recovery (CDR), and programmable B3ZS/HDB3 decoding. Each receiver supports up to 380m DS3, 440m E3, or 360m STS-1 over 75Ω coaxial cable, with dual LOS detection (digital/analog per ANSI T1.231 and ITU G.775).

Transmit paths feature gapped-clock capability up to 51.84MHz, wide-duty-cycle tolerance (50±20%), line-build-out (LBO) control, and full DS3 AIS (ANSI T1.107) and E3 unframed all-ones generation. The integrated jitter attenuator meets Telcordia GR-253 and ITU G.823/G.824 output jitter and jitter transfer requirements, and the clock adapter eliminates need for external oscillators by deriving all line-rate clocks from one master source.

Key Specifications

Pinout & Package

DS3254N+ is housed in a 144-pin, 13mm × 13mm thermally enhanced CSP-BGA (TE-CSBGA) package with exposed thermal pad, optimized for high-density telecom line cards requiring efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-line interface unit applications.

Compared with DS3154N+, DS3254N+ delivers integrated clock synthesis and configurable jitter attenuation depth - reducing component count and enabling tighter jitter compliance. Against MAX3675A, DS3254N+ provides true quad-channel integration with STS-1 support and eliminates need for external jitter management circuitry.

Availability

DS3254N+ is available at Aetrix Electronics and suitable for SONET/SDH multiplexers, digital cross-connect systems, and DSLAM line cards requiring stable component supply across extended temperature and long product lifecycles.

Supply support for DS3254N+ 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 leader in high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial applications.

The DS325x family was designed specifically for carrier-class telecom line interface applications - delivering integrated jitter management, multi-standard compliance, and flexible control interfaces in a single chip to replace discrete solutions.

FAQ

What telecommunication standards does the DS3254N+ comply with?

The DS3254N+ complies with ANSI T1.102 (DS3/E3 electrical interfaces), T1.107 (AIS generation), T1.231 (LOS detection), ITU G.703 (physical layer), G.775 (defect clearance), G.823/G.824 (jitter control), and Telcordia GR-253 (SONET transport). These certifications ensure interoperability in global carrier networks and meet strict jitter transfer and output jitter requirements defined in GR-253 and G.823.

How does the DS3254N+ handle jitter in DS3/E3/STS-1 applications?

The DS3254N+ integrates a crystal-less jitter attenuator meeting Telcordia GR-253 and ITU G.823/G.824 specifications. It can be placed in either the receive or transmit data path - or disabled - and offers selectable FIFO depths (16/32/64/128 bits) to balance jitter suppression against latency. This eliminates need for external jitter-cleaning components while maintaining compliance across all supported line rates.

What clock sources does the DS3254N+ support for its on-chip clock adapter?

The DS3254N+ clock adapter accepts a single master clock input at DS3 (44.736MHz), E3 (34.368MHz), STS-1 (51.84MHz), or common system frequencies including 19.44MHz, 38.88MHz, and 77.76MHz. From this input, it synthesizes all required line-rate clocks - removing need for multiple oscillators and simplifying timing architecture in multi-rate line cards.

Can the DS3254N+ operate in hardware mode without a microcontroller?

Yes, the DS3254N+ supports hardware mode when the HW pin is driven high. In this mode, configuration is set via dedicated pins (e.g., E3SEL, STS1SEL, ENCODER, DECODER), and status is reported on output pins (e.g., RLOSn, TLOS, ALARM). No firmware or register access is required - ideal for simple, deterministic line interface implementations where dynamic reconfiguration is unnecessary.

What is the maximum coaxial cable reach supported by the DS3254N+ receiver?

The DS3254N+ receiver supports up to 380 meters of 75Ω coaxial cable in DS3 mode, 440 meters in E3 mode, and 360 meters in STS-1 mode - achieved through adaptive equalization and automatic gain control (AGC) that compensates for 0–15dB of cable loss. This matches typical repeater spacing in deployed telecom infrastructure.