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Analog Devices Inc./Maxim Integrated DS2155GNB
- Part No.:
- DS2155GNB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LFBGA, CSPBGA
- Datasheet:
-
DS2155GNB.pdf
- Description:
- E1 SINGLE CHIP TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:767
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Product details
Overview
DS2155GNB 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 long-haul and short-haul operation with crystal-less jitter attenuation, programmable 75Ω/100Ω/120Ω termination, and CMI coding for optical interfaces - deployed in carrier-grade T1/E1 line cards and add-drop multiplexers.
For engineers reviewing the DS2155GNB datasheet, DS2155GNB pinout, DS2155GNB application, or DS2155GNB equivalent, key selection criteria include software-selectable T1/E1/J1 mode support, dual elastic-store slip buffers for asynchronous backplanes up to 16.384MHz, integrated BERT generator/detector, G.703-compliant waveform generation, and JTAG boundary-scan test capability.
Technical Context
The DS2155GNB implements independent transmit and receive paths with full T1 (DS1/ISDN-PRI), E1 (CEPT PCM-30/ISDN-PRI), and J1 protocol framing and signaling. Its LIU provides CSU line buildouts (-7.5dB/-15dB/-22.5dB) for T1 and G.703 waveshaping for 75Ω coax and 120Ω twisted-pair E1 media.
It features dual HDLC controllers with FIFO-based packet handling, programmable in-band loop code detection, fractional T1/E1 support, and a backplane clock synthesizer generating 16.384MHz/8.192MHz/4.096MHz/2.048MHz outputs locked to recovered network clock - all controlled via an 8-bit parallel port configurable for Intel or Motorola bus timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Support | Software-selectable single-chip transceiver supporting full T1 (DS1), E1 (CEPT), and J1 framing, signaling, and physical layer compliance. |
| Line Interface | Integrated LIU with crystal-less jitter attenuator, programmable termination (75Ω/100Ω/120Ω), and G.703-compliant transmit waveforms for coax/twisted-pair. |
| Backplane Clock | Synthesizes 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz output synchronized to recovered network clock - enables deterministic TDM interconnect. |
| HDLC Controllers | Dual independent HDLC controllers with programmable FIFO depth, hardware/software signaling insertion, and legacy FDL/D4/SLC-96 support. |
| Test & Diagnostics | Integrated BERT generator/detector, line-code violation (LCV), path-code violation (PCV), frames-out-of-sync (FOS), and E-bit error counters. |
| Package | 100-ball CSBGA (10mm × 10mm, 0.8mm pitch), RoHS-compliant, rated for -40°C to +85°C industrial temperature range. |
| JTAG Support | IEEE 1149.1-compliant boundary-scan architecture with instruction, identification, and boundary scan registers for production test and debug. |
Pinout & Package
DS2155GNB is housed in a 100-ball CSBGA package (10mm × 10mm, 0.8mm ball pitch) with exposed thermal pad. Pin functions are defined across five functional groups: transmit/receive line interface, parallel control port (8-bit Intel/Motorola configurable), extended system information bus (ESIB), user output pins, and JTAG test access port.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TXP/TXN | Differential Transmit Output | LVDS-compatible differential pair driving T1/E1/J1 line; supports G.703-compliant pulse templates and CSU line buildouts. |
| RXP/RXN | Differential Receive Input | Differential input recovering clock/data from network; includes receive level indicator and G.703 sync detection (E1 mode). |
| AD0–AD7 | Address/Data Multiplexed Bus | 8-bit bidirectional parallel port supporting Intel/Motorola timing; used for register access, configuration, and status readback. |
| RD/WR/CS | Control Strobes | Asynchronous read/write strobes and chip select enabling memory-mapped or I/O-mapped host interface. |
| TCK/TMS/TDI/TDO | JTAG Test Access | IEEE 1149.1 boundary-scan interface for structural testing, flash programming, and real-time debug visibility. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates external crystal oscillator requirement while meeting ITU-T G.823/G.824 jitter tolerance and generation specs for T1/E1. |
| Software-selectable termination | On-die resistors configurable per channel for 75Ω (coax), 100Ω (optical), or 120Ω (twisted-pair) - reduces BOM count and layout complexity. |
| Dual elastic-store slip buffers | Two independent two-frame buffers enabling asynchronous TDM backplane interfacing up to 16.384MHz without external FIFOs or glue logic. |
| Programmable BERT | On-chip bit-error-rate test engine supports PRBS-20 pattern generation/detection in both network and backplane directions for field diagnostics. |
| CMI coding option | Integrated Code Mark Inversion encoder/decoder for optical interface compliance per ANSI T1.102 and ITU-T G.703. |
Applications
| Carrier-Class Line Cards | Multi-Service Edge Routers |
|---|---|
|
Use Scenario: High-density T1/E1 line cards in central office and remote terminal equipment requiring protocol flexibility and carrier-grade reliability. IC Role / Device Role / Timing Role: Single-chip transceiver providing full physical layer (LIU), framing, HDLC, and TDM backplane interface - replaces discrete framer + LIU + controller solutions. Use Value: Reduces component count by >40% versus multi-chip alternatives while maintaining full ITU-T/ANSI compliance and jitter performance. |
Use Scenario: Aggregation routers supporting mixed T1/E1 WAN interfaces with embedded signaling and packetized voice/data transport. IC Role / Device Role / Timing Role: Dual-HDLC controller and TDM-to-backplane bridge enabling simultaneous ISDN-PRI and CAS signaling on separate channels. Use Value: Enables hardware-accelerated signaling processing and channelized data forwarding without CPU overhead or external ASICs. |
| Add-Drop Multiplexers (ADMs) | Network Test Equipment |
|
Use Scenario: Compact ADMs performing tributary add/drop in SONET/SDH edge nodes with legacy TDM service interfaces. IC Role / Device Role / Timing Role: TDM backplane interface with 16.384MHz synthesized clock locked to recovered line timing - ensures phase-coherent cross-connect. Use Value: Eliminates need for external clock cleaners or PLLs, simplifying timing architecture and reducing jitter accumulation across stages. |
Use Scenario: Portable bit-error-rate testers and protocol analyzers requiring integrated waveform generation, loopback, and error injection. IC Role / Device Role / Timing Role: Programmable BERT, payload error insertion (T1), and in-band loop code generation/detection - enables full-layer-1 diagnostics. Use Value: Supports field validation of line integrity, framing alignment, and signal regeneration without external test instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1/E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2155LN+ | LQFP-100 package (vs. CSBGA-100); identical electrical specs, same -40°C to +85°C rating, but larger footprint and different thermal profile. | Better suited for prototyping or low-volume designs where reworkability and thermal management via heatsink attachment are prioritized. | Select DS2155LN+ when board-level rework, thermal vias, or manual soldering are required; DS2155GNB preferred for high-density, thermally constrained telecom modules. |
| DS2156GN+ | Pin- and software-compatible successor with enhanced E1 CAS support, improved jitter attenuation, and extended BERT pattern sets - not drop-in due to minor register map extensions. | Required for new designs targeting extended E1 signaling coverage or tighter jitter specs per GR-499-CORE. | DS2156GN+ offers forward compatibility and extended feature set; DS2155GNB remains optimal for cost-sensitive, volume-qualified legacy deployments with established firmware. |
Compared with DS2155LN+ and DS2156GN+, the DS2155GNB delivers identical core transceiver functionality in a space-optimized CSBGA package ideal for high-density line cards, while offering proven qualification for industrial-temperature telecom infrastructure without feature bloat or migration risk.
Availability
DS2155GNB is available at Aetrix Electronics and suitable for carrier-grade T1/E1 line cards, multi-service edge routers, and add-drop multiplexers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for DS2155GNB 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-reliability communication ICs for telecom, industrial, and automotive markets.
The DS2155GNB belongs to Maxim's legacy T1/E1/J1 transceiver product line, designed specifically for carrier-class access and aggregation equipment requiring single-chip integration of physical layer, framing, and backplane interface functions.
FAQ
What is the operating temperature range for the DS2155GNB?
The DS2155GNB is rated for industrial temperature operation from -40°C to +85°C. This specification is validated per Maxim's qualification standards and applies to the 100-ball CSBGA package variant. The device maintains full T1/E1/J1 compliance, jitter performance, and register functionality across this entire range - critical for deployment in uncontrolled central office or outdoor cabinet environments where thermal cycling occurs.
Does the DS2155GNB support both T1 and E1 protocols simultaneously?
No, the DS2155GNB operates in software-selectable T1, E1, or J1 mode - only one protocol active at a time. Mode selection is configured during initialization via register writes to the master mode register (MMR). While the hardware contains all necessary circuitry for all three standards, concurrent operation is not supported; switching requires full reconfiguration of framer, LIU, and HDLC settings.
What clock sources does the DS2155GNB require?
The DS2155GNB requires only a single 25MHz or 50MHz crystal or external clock applied to the MCLK pin. Its internal clock synthesizer derives all necessary frequencies - including 1.544MHz (T1), 2.048MHz (E1), and backplane clocks up to 16.384MHz - from this source. No additional crystals or oscillators are needed, and the crystal-less jitter attenuator eliminates reliance on external timing references for network recovery.
Is the DS2155GNB pin-compatible with the DS2156 series?
Yes, the DS2155GNB is pin- and software-compatible with the DS2156 family per Maxim's datasheet documentation. Both share identical CSBGA-100 pinout, register map structure, and parallel port timing. However, the DS2156 adds extended E1 CAS features and minor register enhancements - existing DS2155GNB firmware runs unchanged, but new DS2156 features require updated driver support.
How is termination resistance configured on the DS2155GNB?
Termination resistance on the DS2155GNB is software-selectable per channel via LIU control registers. Values of 75Ω (for E1 coax), 100Ω (for optical CMI interface), and 120Ω (for E1 twisted-pair or T1 metallic) are implemented using on-die resistor networks. Configuration is non-volatile across power cycles when stored in external EEPROM or loaded by host firmware during initialization.
DS2155GNB 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, HDLC, J1, T1
- 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-CSBGA (10x10)
DS2155GNB FAQ
1.How can I place an order for DS2155GNB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2155GNB 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 DS2155GNB reliable?
The price and inventory of DS2155GNB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2155GNB is usually 5 days.
3.What payment methods are accepted for DS2155GNB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2155GNB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2155GNB?
DS2155GNB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2155GNB 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 DS2155GNB?
For technical support, including DS2155GNB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2155GNB requirements.
6.How does Aetrix verify that DS2155GNB is sourced from the original manufacturer or authorized distributors?
All DS2155GNB 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 DS2155GNB meets industry standards.
7.What is the process for return or replacement of DS2155GNB?
All DS2155GNB units undergo pre-shipment inspection (PSI). If there is an issue with DS2155GNB, 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 DS2155GNB part is unused and in its original packaging.
Return procedure for DS2155GNB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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