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Analog Devices Inc./Maxim Integrated DS2155G+
- Part No.:
- DS2155G+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- -
- Datasheet:
-
DS2155G+.pdf
- Description:
- IC TXRX T1/E1/J1 1-CHIP 100CSBGA
- Quantity:
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Inventory:431
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Product details
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 supports 0°C to +70°C operation in 100-ball CSBGA, delivers crystal-less jitter attenuation, programmable 75Ω/100Ω/120Ω termination, and synthesizes 16.384MHz/8.192MHz/4.096MHz/2.048MHz clocks locked to recovered network timing - deployed in carrier-grade T1/E1 line cards and add-drop multiplexers.
For engineers reviewing the DS2155G+ datasheet, DS2155G+ pinout, DS2155G+ application, or DS2155G+ equivalent, key selection considerations include software-selectable T1/E1/J1 mode support, independent transmit/receive functionality, dual elastic-store slip buffers for asynchronous backplanes up to 16.384MHz, CMI coding capability for optical interfaces, and RoHS-compliant 100-ball CSBGA packaging with verified thermal performance in telecom infrastructure designs.
Technical Context
The DS2155G+ implements a fully integrated T1/E1/J1 physical layer transceiver with separate transmit and receive signal paths, each supporting configurable waveform generation (T1 DSX-1/CSU buildouts; E1 G.703 75Ω coax/120Ω twisted-pair) and clock/data recovery. Its LIU includes a crystal-less jitter attenuator meeting ITU-T G.823/G.824 specifications for long-haul and short-haul applications.
Control is executed via an 8-bit parallel port compatible with Intel- and Motorola-style bus timing, while dual HDLC controllers handle framing, error detection, and signaling insertion. The device features two-frame elastic-store slip buffers enabling connection to asynchronous TDM backplanes operating up to 16.384MHz, with clock synthesis derived from the recovered network clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Mode | Software-selectable single-chip operation across all three standards without hardware change |
| Operating Temp | 0°C to +70°C - validated for commercial-temperature telecom line card deployment |
| Package | 100-ball CSBGA (56-G6008-001) - 10mm × 10mm footprint with fine-pitch ball layout |
| Jitter Attenuation | Crystal-less architecture meeting ITU-T G.823/G.824 mask for T1/E1 long-haul compliance |
| Backplane Clock | Synthesizes 16.384MHz/8.192MHz/4.096MHz/2.048MHz outputs phase-locked to recovered network clock |
| Termination Resistors | Internally programmable 75Ω, 100Ω, or 120Ω on both transmit and receive sides per interface standard |
| HDLC Controllers | Dual independent controllers supporting full-duplex framing, CRC-16, and transparent bit-stream handling |
Pinout & Package
DS2155G+ uses a 100-ball CSBGA package (Maxim part number 56-G6008-001), 10mm × 10mm body size, 0.8mm ball pitch, with exposed thermal pad. Pin functions are defined per the official 10mm CSBGA configuration in DS2155 datasheet Section 4.10 and Figure 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | I/O Power Supply | 3.3V supply for parallel control port and backplane interface logic |
| VDDA | Analog Core Supply | 3.3V supply for LIU analog circuitry including transmitter drivers and receiver amplifiers |
| CLKIN | Reference Clock Input | Accepts 1.544MHz (T1), 2.048MHz (E1), or 1.536MHz (J1) reference for synchronization |
| TXP/TXN | Differential Transmit Output | LVDS-compatible differential pair driving T1/E1/J1 line media with programmable amplitude and rise/fall control |
| RXP/RXN | Differential Receive Input | LVDS-compatible differential input recovering clock and data from line with adaptive threshold and level monitoring |
| TDI/TDO/TCK/TMS | JTAG Test Access Port | IEEE 1149.1 boundary-scan support for production test and debug |
| INT | Interrupt Output | Open-drain active-low signal indicating alarm, status change, or BERT completion |
| RESET | Hardware Reset Input | Asynchronous active-low reset initiating full internal register initialization sequence |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 mode | Single firmware image configures physical layer behavior for any of three standards - eliminates variant SKUs and simplifies inventory |
| Dual independent HDLC controllers | Enables concurrent processing of signaling and payload channels without resource contention or timing conflict |
| Crystal-less jitter attenuator | Meets ITU-T G.823 long-haul jitter tolerance without external crystal oscillator - reduces BOM count and board space |
| Programmable termination resistors | 75Ω/100Ω/120Ω selection per side enables one design to support multiple cable types and regional standards |
| Dual elastic-store slip buffers | Two-frame depth buffers absorb frequency mismatch between network and backplane clocks up to ±100ppm at 16.384MHz |
Applications
| T1/E1 Line Cards | Carrier-Class Routers |
|---|---|
Use Scenario: Embedded in modular line cards for central office switches handling mixed T1/E1 traffic aggregation. IC Role / Device Role / Timing Role: Primary physical-layer transceiver performing line coding, clock recovery, framing, and HDLC channelization. Use Value: Software-selectable mode allows same PCB to serve North American (T1), European (E1), and Japanese (J1) deployments without redesign. | Use Scenario: Front-panel WAN interface module in multi-service edge routers connecting to legacy telco networks. IC Role / Device Role / Timing Role: Dual-role transceiver providing both physical layer connectivity and embedded HDLC signaling for CAS/CCS protocols. Use Value: Internal BERT generator/detector enables in-system link validation without external test equipment during field provisioning. |
| Add-Drop Multiplexers | Network Monitoring Probes |
Use Scenario: Channelized tributary interface in SONET/SDH ADMs extracting DS0s for grooming or service demarcation. IC Role / Device Role / Timing Role: TDM backplane interface synchronizer delivering recovered network clock to downstream FPGA-based time-slot interchange. Use Value: Synthesized 16.384MHz backplane clock maintains phase coherence with network timing - critical for low-jitter voice channel switching. | Use Scenario: Passive tap interface in protocol analyzers capturing live T1/E1 traffic for real-time decoding and alarm correlation. IC Role / Device Role / Timing Role: High-fidelity receive-only front-end with precise G.703 waveform compliance and level monitoring. Use Value: Programmable receive termination and crystal-less jitter attenuation ensure accurate signal capture across diverse line conditions without manual calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1/E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2155L+ | Same core silicon, but in 100-pin LQFP package (56-G5002-000); higher thermal resistance and larger footprint | LQFP preferred for prototyping or lower-volume assemblies where reworkability outweighs density constraints | Select DS2155L+ only when CSBGA assembly capability is unavailable or thermal management favors exposed-pad LQFP |
| DS2156+ | Pin- and software-compatible successor with enhanced jitter performance, extended temperature range (-40°C to +85°C), and improved ESD robustness | Required for industrial or outdoor base station applications demanding wider temp range and higher reliability | DS2156+ is drop-in upgrade path; DS2155G+ remains optimal for cost-sensitive commercial telecom line cards within 0°C–70°C envelope |
Compared with DS2155L+, DS2155G+ offers superior thermal dissipation and board-area efficiency in CSBGA, while DS2156+ extends operational margins and reliability - making DS2155G+ the preferred choice for high-density, cost-optimized T1/E1 line cards targeting commercial temperature environments.
Availability
DS2155G+ is available at Aetrix Electronics and suitable for T1/E1 line cards, carrier-class routers, and add-drop multiplexers requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support in telecom infrastructure programs.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for communications, computing, and industrial systems.
The DS2155G+ belongs to Maxim's T1/E1/J1 transceiver product line, designed specifically for carrier-grade access and aggregation equipment requiring software-configurable, single-chip physical layer solutions with minimal external components.
FAQ
What is the primary function of the DS2155G+ in a telecom system?
The DS2155G+ serves as a software-selectable T1/E1/J1 single-chip transceiver, integrating line interface, framing, HDLC processing, and TDM backplane interfacing. It performs clock recovery, waveform shaping, signaling insertion/detection, and elastic store buffering - enabling direct connection between telecom line media and digital backplanes. DS2155G+ replaces multiple discrete components in legacy designs while maintaining full compliance with ITU-T G.703, GR-499, and ANSI T1.102 standards.
Does the DS2155G+ require an external crystal oscillator?
No, the DS2155G+ incorporates a crystal-less jitter attenuator that meets ITU-T G.823 long-haul specifications without external crystal. It recovers and cleans timing from the incoming line signal, then synthesizes stable output clocks (16.384MHz, 8.192MHz, etc.) phase-locked to the recovered network clock. This eliminates the need for external crystal oscillators, reducing BOM cost and board area - a confirmed feature documented in DS2155 datasheet Sections 24.5 and 30.
What package type does the DS2155G+ use, and is it RoHS-compliant?
The DS2155G+ uses a 100-ball CSBGA package (Maxim designation 56-G6008-001), measuring 10mm × 10mm with 0.8mm ball pitch and an exposed thermal pad. The "+" suffix explicitly denotes lead-free and RoHS-compliant construction, verified per Maxim's ordering information table and package drawings in Section 38.2 of the DS2155 datasheet.
How does the DS2155G+ support both T1 and E1 standards?
The DS2155G+ supports T1 and E1 through software-selectable configuration registers - no hardware changes required. Its LIU generates T1-compliant DSX-1/CSU waveforms (including -7.5dB/-15dB/-22.5dB buildouts) and E1-compliant G.703 waveforms for both 75Ω coaxial and 120Ω twisted-pair cables. Framing, HDLC, and clock synthesis adapt automatically based on selected mode - a core capability confirmed in the General Description and Section 24.1 of the DS2155 datasheet.
Is the DS2155G+ pin-compatible with other devices in the same family?
Yes, the DS2155G+ is pin- and software-compatible with the DS2155L+ (LQFP) and DS2156+ (successor). Maxim explicitly states "The DS2155 is pin and software compatible with the DS2156" in the General Description. While DS2155G+ and DS2155L+ share identical pin functions, their packages differ (CSBGA vs. LQFP), so PCB layout is not interchangeable - but register mapping, control sequences, and signal definitions are identical across all DS2155 variants.
DS2155G+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- -
- Number of Circuits:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DS2155G+ FAQ
1.How can I place an order for DS2155G+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2155G+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS2155G+ reliable?
The price and inventory of DS2155G+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2155G+ is usually 5 days.
3.What payment methods are accepted for DS2155G+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2155G+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2155G+?
DS2155G+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2155G+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS2155G+?
For technical support, including DS2155G+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2155G+ requirements.
6.How does Aetrix verify that DS2155G+ is sourced from the original manufacturer or authorized distributors?
All DS2155G+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS2155G+ meets industry standards.
7.What is the process for return or replacement of DS2155G+?
All DS2155G+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2155G+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS2155G+ part is unused and in its original packaging.
Return procedure for DS2155G+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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