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Analog Devices Inc./Maxim Integrated DS2155L
- Part No.:
- DS2155L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS2155L.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
DS2155L 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, and features crystal-less jitter attenuation for telecom line cards and routers.
For engineers reviewing the DS2155L datasheet, DS2155L pinout, DS2155L application, or DS2155L equivalent, key selection criteria include software-selectable T1/E1/J1 mode support, independent transmit/receive termination (75Ω/100Ω/120Ω), dual elastic-store slip buffers, programmable BERT, and 100-pin LQFP package compatibility with DS2156.
Technical Context
The DS2155L implements a fully integrated LIU with jitter attenuator, G.703-compliant E1 waveform generation for 75Ω coax and 120Ω twisted-pair, and DSX-1/CSU line buildouts (-7.5dB, -15dB, -22.5dB) for T1. Its framer supports T1 D4/ESF and E1 PCM-30/PCM-31 formats with automatic alarm generation and CRC-4 updating.
Control is via an 8-bit parallel port configurable for Intel or Motorola bus timing, and it provides dual HDLC controllers with FIFO-based packet handling, programmable backplane clock synthesis (16.384MHz/8.192MHz/4.096MHz/2.048MHz), and JTAG boundary-scan test access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Support | Software-selectable single-chip operation in all three standards-enables one hardware design for multi-regional deployment. |
| Line Interface | G.703 E1 (75Ω coax, 120Ω twisted-pair) and T1 DSX-1/CSU with selectable line buildouts-eliminates external line drivers or impedance-matching components. |
| Jitter Attenuation | Crystal-less architecture with integrated PLL-reduces need for external crystal oscillator and simplifies board layout. |
| HDLC Controllers | Dual independent HDLC controllers with FIFO buffering-supports simultaneous framing and signaling on separate channels. |
| Elastic Stores | Dual two-frame slip buffers-enables asynchronous TDM backplane interfacing up to 16.384MHz without external FIFOs. |
| Termination Resistors | Software-selectable 75Ω/100Ω/120Ω receive/transmit termination-allows dynamic adaptation to cable type without hardware change. |
| BERT Function | Programmable bit-error-rate tester with repetitive pattern generation and error counting-enables in-system link validation without external test equipment. |
Pinout & Package
DS2155L is housed in a 100-pin LQFP (14mm × 14mm, 0.5mm pitch) package with exposed thermal pad. Pin functions are grouped into transmit/receive LIU, parallel control port (Intel/Motorola modes), TDM backplane interface, JTAG test access, and supply rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TXP/TXN | Differential transmit output | Drives T1/E1 line with G.703-compliant waveshape and programmable amplitude; connects directly to transformer or line driver. |
| RXP/RXN | Differential receive input | Accepts network signals with adaptive threshold detection and clock/data recovery; supports 75Ω/120Ω termination via register control. |
| CLKIN | Reference clock input | Accepts 1.544MHz (T1) or 2.048MHz (E1) reference; used for synchronization and jitter attenuation loop. |
| RDY/INT | Interrupt/ready indicator | Signals framer lock, alarm conditions, or HDLC FIFO status-enables efficient polling-free firmware handling. |
| AD0–AD7 | Address/data multiplexed bus | 8-bit parallel interface supporting Intel/Motorola timing-allows direct connection to microcontroller or FPGA without glue logic. |
| TMS/TCK/TDI/TDO | JTAG boundary-scan interface | Enables IEEE 1149.1 compliance for production testing, in-circuit debugging, and configuration verification. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 mode | Single firmware image adapts to regional line standards-reduces BOM variants and qualification effort across global deployments. |
| Dual independent HDLC controllers | Enables concurrent D-channel signaling (ISDN-PRI) and embedded OAM channel handling-no external controller required for layered protocol stacks. |
| Crystal-less jitter attenuator | Integrates PLL-based clock cleanup without external crystal-lowers component count and improves long-term frequency stability over temperature. |
| Programmable BERT generator/detector | Performs in-field BER validation on live links using internal pattern generators and error counters-replaces external test gear during commissioning and maintenance. |
| Internal elastic-store slip buffers | Two-frame asynchronous buffering enables seamless TDM backplane interfacing at 16.384MHz-even with clock domain mismatches between line and system clocks. |
Applications
| T1/E1 Line Cards | Carrier-Class Routers |
|---|---|
Use Scenario: Embedded in modular line cards for central office and remote terminal applications requiring multi-standard TDM interface support. IC Role / Device Role / Timing Role: Primary line transceiver providing physical layer framing, clock recovery, and HDLC signaling for T1/E1 trunk aggregation. Use Value: Eliminates discrete framer + LIU + HDLC chip combination-reduces PCB area by >40% and power consumption by 25% versus multi-chip solutions. | Use Scenario: Deployed in service provider edge routers handling mixed T1/E1 WAN interfaces with ISDN-PRI and CAS signaling. IC Role / Device Role / Timing Role: Dual-role transceiver managing both data payload transport and out-of-band signaling channel framing. Use Value: Enables simultaneous T1 D4 framing and E1 PCM-30 CAS processing-supports legacy circuit-switched voice and modern data services on same hardware. |
| Add-Drop Multiplexers (ADMs) | Network Access Devices |
Use Scenario: Used in metro ADMs where flexible line interface selection and low-jitter clock distribution are critical for cascaded timing chains. IC Role / Device Role / Timing Role: Jitter-attenuating line interface with synthesized backplane clock outputs (16.384MHz/8.192MHz)-serves as timing master for downstream TDM stages. Use Value: Provides sub-100ps RMS jitter on recovered and synthesized clocks-meets GR-1244-CORE jitter transfer requirements for SONET/SDH interworking. | Use Scenario: Integrated into business gateway devices connecting PBX systems to PSTN via T1/E1 trunks with PRI/BRI signaling. IC Role / Device Role / Timing Role: Full-featured SCT handling line buildout, termination, framing, and HDLC-controlled signaling-replaces multiple ASICs. Use Value: Supports software-defined line configuration (e.g., switch between T1 ESF and E1 CRC4) via register writes-enables field-upgradable service provisioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1/E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2156 | Pin- and software-compatible successor with enhanced E1 CAS support and improved jitter tolerance specs. | Targeted at new designs requiring extended E1 feature set and longer product lifecycle availability. | Select DS2156 for new designs needing documented long-term supply and expanded E1 signaling modes. |
| MC2155 | Functionally similar but manufactured by Microchip; lacks CMI coding option and has different register map for BERT and elastic store control. | Suitable for cost-sensitive industrial gateways where full Maxim feature parity is not required. | Choose MC2155 only when register-level firmware porting effort is acceptable and CMI optical interface is unused. |
Compared with DS2156 and MC2155, the DS2155L offers verified pin/software compatibility with legacy DS2156-based designs while retaining full CMI coding and crystal-less jitter attenuation-making it optimal for drop-in replacement in existing T1/E1 line card revisions.
Availability
DS2155L is available at Aetrix Electronics and suitable for T1/E1 line cards, carrier-class routers, and add-drop multiplexers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS2155L 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial markets.
The DS2155L belongs to Maxim's T1/E1/J1 transceiver product line, designed specifically for carrier-grade telecom infrastructure requiring integrated framing, line interface, and signaling functionality in a single chip.
FAQ
What is the operating temperature range for the DS2155L?
The DS2155L is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with standard telecom line card environments where forced-air cooling is available. The DS2155L+ variant offers identical performance with lead-free/RoHS-compliant packaging, and the DS2155LN extends the range to -40°C to +85°C for extended-temperature applications. All variants share the same 100-pin LQFP footprint and register-level compatibility.
Does the DS2155L support both T1 and E1 framing simultaneously?
No, the DS2155L operates in software-selectable T1, E1, or J1 mode-not concurrently. Mode selection is performed at initialization via register writes to the master mode register (MMR), and the device locks to the chosen standard for the duration of operation. While dual HDLC controllers allow independent signaling on separate channels, the framer, LIU, and clock synthesis blocks are configured exclusively for the selected standard per power-on cycle.
What line buildout options does the DS2155L provide for T1 applications?
The DS2155L supports DSX-1 and CSU line buildouts for T1: -7.5dB, -15dB, and -22.5dB. These are implemented digitally within the transmit interface and applied to the differential TXP/TXN outputs. Buildout selection is controlled via LIU configuration registers and requires no external passive components. The device also supports E1 G.703 waveshapes for both 75Ω coaxial and 120Ω twisted-pair cables, with termination resistors programmable per interface side.
Is the DS2155L pin-compatible with the DS2156?
Yes, the DS2155L is explicitly stated in the datasheet as pin- and software-compatible with the DS2156. Both share identical 100-pin LQFP packaging, matching pin functions, register map structure, and initialization sequences. This allows direct PCB-level replacement in existing DS2156 designs without layout changes, though firmware updates may be needed to leverage DS2156-specific enhancements like extended E1 CAS handling.
What clock frequencies can the DS2155L synthesize for the TDM backplane interface?
The DS2155L synthesizes four fixed backplane clock frequencies-16.384MHz, 8.192MHz, 4.096MHz, and 2.048MHz-all phase-locked to the recovered network clock. Synthesis is performed internally using a fractional-N PLL; no external clock generator is required. The selected frequency is configured via the clock map register and determines the TDM frame rate and slot timing alignment for the backplane interface.
DS2155L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Single-Chip Transceiver
- Interface:
- E1, HDLC, J1, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS2155L FAQ
1.How can I place an order for DS2155L through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2155L 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 DS2155L reliable?
The price and inventory of DS2155L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2155L is usually 5 days.
3.What payment methods are accepted for DS2155L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2155L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2155L?
DS2155L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2155L 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 DS2155L?
For technical support, including DS2155L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2155L requirements.
6.How does Aetrix verify that DS2155L is sourced from the original manufacturer or authorized distributors?
All DS2155L 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 DS2155L meets industry standards.
7.What is the process for return or replacement of DS2155L?
All DS2155L units undergo pre-shipment inspection (PSI). If there is an issue with DS2155L, 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 DS2155L part is unused and in its original packaging.
Return procedure for DS2155L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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