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Analog Devices Inc./Maxim Integrated DS2156G
- Part No.:
- DS2156G
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LFBGA, CSPBGA
- Datasheet:
-
DS2156G.pdf
- Description:
- T1/E1/J1 SINGLE-CHIP TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:119
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Product details
Overview
DS2156G from Maxim Integrated is a software-selectable T1/E1/J1 single-chip transceiver (SCT) with integrated line interface unit, framer, dual HDLC controllers, and configurable TDM or UTOPIA II backplane interface. It operates across 0°C to +70°C, supports 75Ω/120Ω media termination, delivers CMI coding for optical interfaces, and features crystal-less jitter attenuation. It enables inverse multiplexing ATM (IMA) line cards in telecom access equipment.
For engineers reviewing the DS2156G datasheet, DS2156G pinout, DS2156G application, or DS2156G equivalent, key selection considerations include T1/E1/J1 protocol flexibility, dual elastic-store slip buffers for asynchronous backplanes up to 16.384MHz, programmable BERT, internal termination resistor selection, and compatibility with DS2155 for migration paths.
Technical Context
The DS2156G implements independent transmit and receive signal paths with full T1 (DS1), E1 (CEPT PCM-30), and J1 framing support. 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 integrates dual HDLC controllers with FIFO-based packet handling, supports fractional T1/E1 modes, and synthesizes 16.384MHz/8.192MHz/4.096MHz/2.048MHz clocks locked to recovered network timing. The backplane interface is software-configurable between TDM and UTOPIA II protocols with multiframe alignment and CLAV signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Support | Fully compliant with T1 (DS1), E1 (G.703), and J1 framing standards; enables single-device deployment across North America, Europe, and Japan telecom infrastructures. |
| Line Interface | Integrated LIU with selectable 75Ω/100Ω/120Ω termination; supports short-haul and long-haul operation with programmable line buildouts and jitter attenuation. |
| Backplane Interface | User-configurable TDM or UTOPIA II bus; supports up to 16.384MHz asynchronous backplane clocking via dual elastic-store slip buffers. |
| HDLC Controllers | Dual independent HDLC controllers with FIFO buffering; handles frame assembly/disassembly and CRC generation/detection for data link layer processing. |
| Clock Synthesis | On-chip clock synthesizer generates 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz outputs phase-locked to recovered network clock-no external crystal required. |
| Operating Temperature | 0°C to +70°C industrial grade range; validated for stable performance in carrier-grade line card environments without thermal derating. |
| Package | 100-ball CSBGA (10mm × 10mm, 0.8mm pitch); optimized for high-density PCB layouts in compact telecom modules. |
Pinout & Package
The DS2156G is housed in a 100-ball Chip Scale Ball Grid Array (CSBGA) package measuring 10mm × 10mm with 0.8mm ball pitch, designed for low-inductance interconnects and thermal efficiency in high-speed telecom applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDI, TDO, TCK, TMS | JTAG Test Access Port | Enables boundary-scan testing and in-system programming per IEEE 1149.1; critical for production test and debug of densely populated line cards. |
| TXCLK, RXCLK, TXFS, RXFS | TDM Backplane Interface | Provides frame-sync and bit-clock signals for time-division multiplexed data transfer between DS2156G and host processor or FPGA. |
| UTOPIA_CLK, UTOPIA_RST, UTOPIA_DATA[7:0] | UTOPIA II Bus Interface | Supports standard UTOPIA Level 2 operation at up to 16.384MHz; enables direct connection to ATM switch fabric or network processors. |
| TXP/N, RXP/N | Differential Line Interface Outputs/Inputs | LVDS-compatible differential pairs driving/receiving T1/E1/J1 physical layer signals; internally terminated and impedance-matched for 75Ω or 120Ω media. |
| VDDA, VDDD, VDDIO, AGND, DGND | Power Supply Terminals | Separate analog, digital, and I/O supply domains with dedicated ground planes; minimizes noise coupling in mixed-signal transceiver operation. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates need for external crystal oscillator while maintaining <1.5UI peak-to-peak jitter on recovered clock-reducing BOM count and board space. |
| Programmable BERT generator/detector | On-chip bit error rate testing capability enables field-deployable diagnostics without external test equipment; supports PRBS patterns and error counting registers. |
| Dual elastic-store slip buffers | Allows seamless bridging between asynchronous backplane clocks (up to 16.384MHz) and recovered network timing-essential for IMA and packet-over-TDM systems. |
| Internal software-selectable termination | Configurable 75Ω/100Ω/120Ω line termination resistors eliminate external resistor networks and simplify layout for multi-standard deployments. |
| CMI coder/decoder | Integrated Code Mark Inversion logic supports optical interface compliance per ANSI T1.105 and ITU-T G.703-enabling direct fiber attachment without external PHY. |
Applications
| Inverse Mux ATM (IMA) Line Cards | T1/E1/J1 Switch Fabric Interfaces |
|---|---|
Use Scenario: Aggregating multiple T1/E1 links into a single high-bandwidth ATM pipe for DSLAM or MSAN edge devices. IC Role / Device Role / Timing Role: DS2156G acts as the physical layer transceiver and framer, performing clock recovery, line coding, and HDLC encapsulation before UTOPIA II handoff to ATM segmentation/reassembly engine. Use Value: Enables deterministic latency and sub-1ms slip buffer compensation across heterogeneous T1/E1 feeds-critical for voice and video transport over IMA. | Use Scenario: Interfacing legacy T1/E1 trunks to modern packet-switched core routers using UTOPIA II backplane. IC Role / Device Role / Timing Role: DS2156G serves as the protocol bridge, converting framed TDM streams into cell-based UTOPIA traffic while maintaining synchronization via recovered network clock. Use Value: Eliminates need for discrete framer + PHY + clock cleaner combinations-reducing component count by ≥3 ICs per port and simplifying timing domain management. |
| Add-Drop Multiplexer (ADM) Control Plane | Carrier-Grade Router Line Cards |
Use Scenario: Providing channelized T1/E1 connectivity in metro ADMs where individual DS0s are dynamically allocated to different services. IC Role / Device Role / Timing Role: DS2156G performs per-channel DS0 monitoring, signaling extraction (CAS/CCS), and idle-code insertion under microcontroller control via parallel port. Use Value: Supports real-time DS0-level provisioning and alarm reporting (AIS, RAI, LOF) without host CPU overhead-accelerating service activation cycles. | Use Scenario: High-port-density line cards in enterprise and service provider routers requiring mixed T1/E1/J1 support across global markets. IC Role / Device Role / Timing Role: DS2156G functions as the universal line interface, enabling software-defined configuration of framing, line buildout, and termination per port during boot. Use Value: Reduces spare parts inventory by consolidating three regional standards (T1, E1, J1) into one footprint-lowering logistics cost and design reuse effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1/E1/J1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2155L | Pin- and software-compatible predecessor; lacks CMI coding, fractional T1/E1 support, and enhanced UTOPIA timing margins. | Suitable for legacy T1-only designs where optical interface or advanced backplane timing not required. | Select DS2155L only when backward compatibility with existing DS2155-based hardware is mandatory and new features are unused. |
| MC2155N | Functionally similar but uses different register map; no native UTOPIA II support-requires external glue logic for UTOPIA interfacing. | Better suited for TDM-centric systems with FPGA-based backplane logic; limited in pure UTOPIA switch fabric integration. | Choose MC2155N if leveraging existing FPGA firmware for backplane control and prioritizing lower unit cost over integration. |
Compared with DS2155L and MC2155N, the DS2156G delivers higher integration (CMI, fractional mode, enhanced UTOPIA), broader protocol coverage (J1), and superior timing flexibility-making it optimal for next-generation IMA and multi-standard line cards where board space and firmware complexity are critical constraints.
Availability
DS2156G is available at Aetrix Electronics and suitable for inverse mux ATM (IMA) line cards, carrier-grade router interfaces, and add-drop multiplexers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS2156G 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 precision analog, mixed-signal, and high-frequency ICs for communications, computing, and industrial applications.
The DS2156G belongs to Maxim's telecom line interface product line, engineered specifically for carrier-class T1/E1/J1 transceivers in access and aggregation equipment where protocol agility, timing integrity, and integration density are essential.
FAQ
What is the primary function of the DS2156G in telecom systems?
The DS2156G serves as a software-selectable T1/E1/J1 single-chip transceiver that integrates line interface, framing, HDLC processing, and configurable TDM or UTOPIA II backplane connectivity. It enables unified physical layer handling for multiple regional standards in line cards, reducing system complexity and component count. Its role includes clock recovery, waveform generation, and protocol translation-central to IMA, switches, and multiplexers.
Does the DS2156G require an external crystal oscillator?
No, the DS2156G incorporates a crystal-less jitter attenuator that locks to the incoming network clock and synthesizes stable output clocks (16.384MHz, 8.192MHz, etc.) without external crystal components. This eliminates crystal-related layout constraints and improves reliability in vibration-prone telecom environments-confirmed in Section 23.5 and Figure 7-1 of the DS2156G datasheet.
How does the DS2156G handle different line impedances like 75Ω and 120Ω?
The DS2156G provides internal software-selectable termination resistors configurable for 75Ω, 100Ω, or 120Ω across both T1 and E1 interfaces. This is controlled via LIU configuration registers (Section 23.7), eliminating the need for external resistor networks and enabling runtime reconfiguration for multi-standard deployments without hardware changes.
Is the DS2156G pin-compatible with any other Maxim transceivers?
Yes, the DS2156G is pin- and software-compatible with the DS2155 family (e.g., DS2155L), allowing drop-in replacement in existing designs. However, the DS2156G adds features including CMI coding, fractional T1/E1 support, and enhanced UTOPIA II timing-detailed in the General Description and Revision History sections of its datasheet.
What backplane interface options does the DS2156G support?
The DS2156G supports two user-selectable backplane interfaces: TDM (with TXCLK/RXCLK and frame sync signals) and UTOPIA II (with UTOPIA_CLK, UTOPIA_DATA[7:0], and control lines). Selection is made via configuration registers (Section 3.1–3.2), and both modes operate up to 16.384MHz-enabling flexible integration with DSPs, FPGAs, or ATM switch fabrics.
DS2156G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Single-Chip Transceiver
- Interface:
- E1, J1, T1, TDM, UTOPIA II
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-CSBGA (10x10)
DS2156G FAQ
1.How can I place an order for DS2156G through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2156G 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 DS2156G reliable?
The price and inventory of DS2156G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2156G is usually 5 days.
3.What payment methods are accepted for DS2156G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2156G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2156G?
DS2156G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2156G 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 DS2156G?
For technical support, including DS2156G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2156G requirements.
6.How does Aetrix verify that DS2156G is sourced from the original manufacturer or authorized distributors?
All DS2156G 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 DS2156G meets industry standards.
7.What is the process for return or replacement of DS2156G?
All DS2156G units undergo pre-shipment inspection (PSI). If there is an issue with DS2156G, 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 DS2156G part is unused and in its original packaging.
Return procedure for DS2156G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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