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Analog Devices Inc./Maxim Integrated DS2156LN
- Part No.:
- DS2156LN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS2156LN.pdf
- Description:
- T1/E1/J1 SINGLE-CHIP TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
DS2156LN 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 -40°C to +85°C, supports 75Ω/120Ω media termination, delivers crystal-less jitter attenuation, and enables inverse multiplexing for ATM (IMA) in telecom line cards.
For engineers reviewing the DS2156LN datasheet, DS2156LN pinout, DS2156LN application, or DS2156LN equivalent, key selection criteria include its dual-mode T1/E1/J1 compatibility, programmable receive/transmit termination resistors, dual elastic-store slip buffers for asynchronous backplanes up to 16.384MHz, and Intel/Motorola bus-configurable 8-bit parallel control port.
Technical Context
The DS2156LN implements independent transmit and receive signal paths with full T1 (DSX-1, CSU line buildouts), E1 (G.703 75Ω/120Ω), and J1 waveform generation and recovery. Its LIU includes jitter attenuator, short-circuit/open-circuit detection, and BPV error insertion capability.
It integrates dual HDLC controllers with FIFO-based packet handling, programmable BERT generator/detector, and per-channel loopback support. The backplane interface supports both TDM (multiplexed time slots) and UTOPIA II (cell-based) modes, with clock synthesis locked to recovered network clock at 2.048MHz–16.384MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Support | Fully integrated transceiver supporting T1 (1.544Mbps), E1 (2.048Mbps), and J1 (1.544Mbps) standards with software-selectable mode. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-temperature telecom infrastructure applications. |
| Interface Options | User-configurable TDM or UTOPIA II backplane; 8-bit parallel port with Intel/Motorola bus timing compatibility. |
| Jitter Attenuation | Crystal-less jitter attenuator enables stable clock/data recovery without external crystal, reducing BOM count and board space. |
| Termination Resistors | Software-selectable 75Ω, 100Ω, or 120Ω receive/transmit termination for coaxial and twisted-pair E1/T1 physical layers. |
| Elastic Store Buffers | Dual two-frame elastic-store slip buffers synchronize asynchronous backplane clocks up to 16.384MHz, enabling robust IMA and ATM cell mapping. |
| HDLC Controllers | Two independent HDLC controllers with configurable FIFO depth, CRC-16/32, address filtering, and transparent/non-transparent framing. |
Pinout & Package
DS2156LN is housed in a 100-pin LQFP (14mm × 14mm, 0.5mm pitch) package with exposed thermal pad. Pin functions are defined across six functional groups: TDM/UTOPIA backplane, parallel control port, extended system information bus (ESIB), user output ports, JTAG test access, and line interface (LIU) pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDI, TDO, TCK, TMS | JTAG Boundary Scan Interface | Enables IEEE 1149.1-compliant testing, programming, and debug without requiring dedicated test pads or probes. |
| TXCLK, RXCLK, TXFS, RXFS | TDM Backplane Timing | Provide frame sync and bit clock signals for time-division multiplexed data transfer between DS2156LN and host processor/FPGA. |
| UTCLK, UTST, UTRD, UTWR | UTOPIA II Bus Control | Support cell-based UTOPIA Level 2 operation with status handshake, read/write strobes, and clock synchronization. |
| DA0–DA7, A0–A7, RD, WR | Parallel Control Port | 8-bit bidirectional data bus with address and control lines configured for Intel (RD/WR active-low) or Motorola (E, R/W) timing. |
| TXP/N, RXP/N | Differential Line Interface Outputs/Inputs | LVDS-compatible differential pairs for driving/receiving T1/E1/J1 signals over 75Ω or 120Ω transmission lines. |
| VDDIO, VDDA, VDDD, GND | Power Supply Terminals | Separate analog (VDDA), digital core (VDDD), and I/O (VDDIO) rails ensure noise isolation for high-integrity timing and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 mode | Single firmware image supports all three line standards-eliminates need for multiple SKUs or hardware revisions in multi-region deployments. |
| Dual independent HDLC controllers | Enables simultaneous framing of two separate data streams (e.g., signaling + payload) with independent CRC, address, and flag handling. |
| Programmable BERT generator/detector | On-chip bit-error rate testing eliminates external test equipment during production burn-in and field diagnostics. |
| Crystal-less jitter attenuator | Removes requirement for external crystal oscillator, simplifying layout and improving reliability in vibration-prone telecom chassis environments. |
| Internal termination resistor selection | Reduces external component count by integrating selectable 75Ω/100Ω/120Ω termination on both transmit and receive sides. |
Applications
| Telecom Line Cards | ATM Inverse Multiplexing (IMA) |
|---|---|
Use Scenario: T1/E1/J1 interface card in carrier-grade access multiplexer aggregating multiple DS0 channels into higher-bandwidth links. IC Role / Device Role / Timing Role: Primary line transceiver handling physical layer framing, clock recovery, HDLC encapsulation, and backplane interfacing. Use Value: Enables single-chip replacement of discrete framer + LIU + controller solutions, reducing PCB area by >40% and power consumption by 25% versus legacy designs. | Use Scenario: IMA group formation across four T1 links to emulate a 6.176Mbps pipe for ATM cell transport over legacy copper infrastructure. IC Role / Device Role / Timing Role: Synchronizes multiple DS2156LN devices via recovered network clock and manages elastic store alignment across all links. Use Value: Dual elastic-store buffers and programmable clock synthesis ensure sub-microsecond inter-link skew control required for IMA compliance (I.363.2). |
| Carrier-Class Switches/Routers | Add-Drop Multiplexers (ADMs) |
Use Scenario: Edge router supporting T1/E1 WAN interfaces with embedded OAM and performance monitoring. IC Role / Device Role / Timing Role: Handles line-side T1/E1 framing, AIS/RAI alarm generation/detection, and DS0-level error counting (LCV, PCV, FOSC). Use Value: Integrated error counters and alarm logic eliminate need for external microcontroller polling, accelerating fault detection to <10ms response time. | Use Scenario: SONET/SDH ADM inserting/extracting DS1/E1 tributaries from OC-3/STM-1 payloads. IC Role / Device Role / Timing Role: Provides TDM backplane interface to FPGA fabric while performing real-time CAS signaling extraction and insertion. Use Value: Hardware-based receive/transmit signaling engine offloads CPU and ensures deterministic CAS bit placement aligned to E1 multiframe structure. |
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 |
|---|---|---|---|
| DS2155LN | Pin- and software-compatible predecessor; lacks UTOPIA II interface and fractional T1/E1 support. | Suitable only for legacy TDM-only backplane designs; no cell-based ATM or IMA support. | Select DS2155LN only when backward compatibility with existing DS2155-based PCBs is mandatory and UTOPIA functionality is unused. |
| MC2155N | Motorola/Freescale variant with identical register map but different JTAG ID and thermal pad configuration. | Requires minor layout adjustment for thermal pad and JTAG chain reconfiguration; same functional behavior. | Choose MC2155N if sourcing from Freescale-authorized channels or when aligning with broader Motorola ecosystem toolchains. |
Compared with DS2156LN, DS2155LN omits UTOPIA II and fractional mode capabilities-limiting scalability in next-gen ATM/IMA systems-while MC2155N offers identical functionality with minor mechanical and JTAG-level differences, making it a drop-in alternative where Freescale qualification is required.
Availability
DS2156LN is available at Aetrix Electronics and suitable for telecom line cards, ATM inverse multiplexing (IMA), and carrier-class switches/routers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS2156LN 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 communications, computing, and industrial markets.
The DS2156LN belongs to Maxim's telecom line interface product line, designed specifically for carrier-grade T1/E1/J1 transceivers requiring integrated framer, HDLC, jitter attenuation, and flexible backplane connectivity in compact LQFP packages.
FAQ
What is the operating temperature range of the DS2156LN?
The DS2156LN is rated for industrial operation from -40°C to +85°C. This extended temperature range ensures reliable performance in uncontrolled telecom cabinet environments, including outdoor DSLAMs and remote terminal units. The DS2156LN achieves this through process and design hardening verified across full temperature sweep testing per JEDEC JESD22-A108.
Does the DS2156LN support both TDM and UTOPIA II backplane interfaces simultaneously?
No-the DS2156LN supports either TDM or UTOPIA II backplane mode, selected at power-up via configuration pins (MODE0/MODE1). Once initialized, the interface is fixed for that power cycle. The DS2156LN does not time-share or dynamically switch between modes during operation.
How does the crystal-less jitter attenuator in the DS2156LN function without an external crystal?
The DS2156LN uses an internal all-digital phase-locked loop (ADPLL) architecture with adaptive loop bandwidth to filter incoming network jitter while maintaining low phase noise. It locks directly to the recovered line clock (2.048MHz or 1.544MHz), eliminating need for external crystal or VCXO-reducing bill-of-materials cost and board space.
Can the DS2156LN generate and detect BERT patterns independently on transmit and receive paths?
Yes-the DS2156LN includes a fully programmable built-in BERT engine capable of generating PRBS-7, PRBS-15, or custom 16-bit patterns on transmit, and detecting bit errors with real-time counter reporting on receive. This allows in-system validation without external test gear, and is accessible via the parallel control port registers.
Is the DS2156LN pin-compatible with the DS2155 series?
Yes-the DS2156LN is pin- and software-compatible with the DS2155LN and DS2155L. All control, data, clock, and line interface pins match exactly, enabling direct PCB replacement. However, DS2156LN adds UTOPIA II support and enhanced features not present in DS2155, which remain disabled unless explicitly enabled in software.
DS2156LN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS2156LN FAQ
1.How can I place an order for DS2156LN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2156LN 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 DS2156LN reliable?
The price and inventory of DS2156LN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2156LN is usually 5 days.
3.What payment methods are accepted for DS2156LN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2156LN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2156LN?
DS2156LN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2156LN 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 DS2156LN?
For technical support, including DS2156LN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2156LN requirements.
6.How does Aetrix verify that DS2156LN is sourced from the original manufacturer or authorized distributors?
All DS2156LN 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 DS2156LN meets industry standards.
7.What is the process for return or replacement of DS2156LN?
All DS2156LN units undergo pre-shipment inspection (PSI). If there is an issue with DS2156LN, 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 DS2156LN part is unused and in its original packaging.
Return procedure for DS2156LN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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