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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:
- IC TELECOM INTERFACE 100CSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,758
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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 termination (75Ω/100Ω/120Ω), and CMI coding for optical interfaces. Used in carrier-grade line cards requiring multi-standard compliance and asynchronous backplane connectivity up to 16.384MHz.
For engineers reviewing the DS2155GNB+ datasheet, DS2155GNB+ pinout, DS2155GNB+ application, or DS2155GNB+ equivalent, key selection considerations include its dual-framer architecture, software-selectable media interface (T1/E1/J1), elastic-store slip buffer design, synthesized clock outputs (2.048–16.384MHz), and JTAG boundary-scan test support - all critical for telecom infrastructure timing and signal integrity validation.
Technical Context
The DS2155GNB+ implements independent transmit and receive paths with full T1 (DS1/ISDN-PRI/J1) and E1 (CEPT PCM-30/ISDN-PRI) framing, including G.703 compliant waveshaping for 75Ω coax and 120Ω twisted-pair. Its LIU includes integrated jitter attenuator and programmable line buildouts (−7.5dB/−15dB/−22.5dB for T1).
It features dual HDLC controllers with FIFO-based packet handling, programmable BERT generator/detector, and two-frame elastic-store buffers enabling asynchronous TDM backplane interfacing. Clock synthesis derives 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz outputs locked to recovered network clock - essential for synchronization across mixed-rate systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Support | Fully integrated, software-selectable transceiver supporting T1 (DS1), E1 (CEPT), and J1 standards in one device - eliminates need for separate framer/LIU ICs. |
| Interface Type | 8-bit parallel port configurable for Intel or Motorola bus timing - enables direct connection to common microcontrollers and DSPs without glue logic. |
| Jitter Attenuation | Crystal-less jitter attenuator meeting ITU-T G.823/G.824 requirements - removes external crystal oscillator and reduces board space/cost. |
| Termination Resistors | Software-selectable 75Ω, 100Ω, or 120Ω on transmit/receive sides - supports both T1 and E1 physical layer variants without hardware changes. |
| Backplane Clock | Synthesizes 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz from recovered network clock - ensures deterministic phase alignment with TDM backplanes. |
| HDLC Controllers | Dual independent HDLC controllers with dedicated FIFOs - enables concurrent signaling channel management (e.g., D-channel + maintenance channel). |
| Loopback Modes | Per-channel digital, analog, and line loopbacks with JTAG boundary-scan - supports comprehensive in-system diagnostics and field validation. |
Pinout & Package
DS2155GNB+ is housed in a 100-ball CSBGA (Chip Scale Ball Grid Array) package measuring 10mm × 10mm with 0.8mm ball pitch. The package supports fine-pitch routing and thermal performance suitable for high-density telecom line card layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TD+, TD− | Transmit differential output | Drives T1/E1 line with G.703-compliant waveshape; supports selectable impedance and line buildout. |
| RD+, RD− | Receive differential input | Receives network data and recovers clock; includes level indicator and threshold interrupt capability. |
| CLKOUT | Synthesized backplane clock output | Provides 2.048–16.384MHz clock derived from recovered network clock - eliminates need for external clock synthesizer. |
| INT | Interrupt request output | Active-low open-drain signal indicating alarm, error, or status change - simplifies host processor interrupt handling. |
| TMS, TCK, TDI, TDO | JTAG test access port | Enables IEEE 1149.1 boundary-scan testing and in-circuit programming - critical for production test and debug. |
| VDD, VDDIO, VSS | Power supply terminals | Separate analog/digital/IO supplies (3.3V core, 3.3V I/O) - improves noise immunity and signal integrity in mixed-signal environments. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 mode | Single firmware image supports all three standards - reduces inventory complexity and enables field-upgradable line cards. |
| Dual elastic-store slip buffers | Two-frame depth per channel accommodates ±100ppm frequency offset between network and backplane clocks - enables robust asynchronous TDM interfacing. |
| Programmable BERT generator/detector | On-chip bit-error rate testing at line rate without external test equipment - accelerates system bring-up and field maintenance. |
| CMI coder/decoder | Integrated Code Mark Inversion logic for optical interface compliance - eliminates discrete CMI IC and associated layout constraints. |
| Internal termination resistors | 75Ω/100Ω/120Ω selectable via register write - removes external resistor networks and improves PCB layout flexibility. |
Applications
| Carrier T1/E1 Line Cards | Multi-Service Edge Routers |
|---|---|
Use Scenario: High-density line cards in central office switches aggregating 32+ T1/E1 circuits onto a TDM backplane. IC Role / Device Role / Timing Role: Primary transceiver handling framing, line interface, clock recovery, and backplane clock synthesis. Use Value: Single-chip integration reduces component count by >40% vs. discrete framer + LIU solutions while maintaining full ITU-T G.703/G.704 compliance. |
Use Scenario: Edge routers supporting legacy TDM voice and data services alongside packet switching. IC Role / Device Role / Timing Role: Bridging TDM physical layer to internal packet-switched fabric via TDM backplane interface. Use Value: Dual HDLC controllers and elastic-store buffers enable simultaneous CAS signaling and maintenance channel handling without CPU overhead. |
| Add-Drop Multiplexers (ADMs) | Network Element Management Interfaces |
Use Scenario: ADMs inserting/dropping DS0 channels across multiple T1/E1 spans with embedded OAM&P functions. IC Role / Device Role / Timing Role: Framer and signaling engine managing frame alignment, AIS/RAI detection, and DS0 monitoring. Use Value: Integrated DS0 monitoring and programmable idle-code generation simplify channel-level service provisioning and fault isolation. |
Use Scenario: Embedded management processors accessing line status, error counters, and alarm states via parallel port. IC Role / Device Role / Timing Role: Local intelligence node providing real-time LIU health metrics and framer statistics. Use Value: On-chip error counters (LCVCR, PCVCR, FOSCR, EBCR) deliver granular diagnostics without external monitoring ICs. |
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+ | LQFP-100 package (vs. CSBGA-100); identical electrical specs and register map; same temperature range (0°C to +70°C). | Better suited for prototyping and manual assembly due to larger pitch and visible leads; less optimal for high-density line cards. | Select DS2155L+ when board-level rework or thermal inspection is prioritized over footprint density. |
| DS2155GN | Same CSBGA-100 package and −40°C to +85°C rating, but lacks RoHS-compliant plating (non-lead-free). | Acceptable where lead-free compliance is not mandated by regional regulations or OEM requirements. | Choose DS2155GN only if RoHS exemption applies and cost sensitivity outweighs environmental compliance needs. |
Compared with DS2155GNB+, DS2155L+ offers easier soldering and visual inspection but increases PCB area by ~35%; DS2155GN provides identical performance and form factor but requires leaded assembly processes - making DS2155GNB+ the default choice for new RoHS-compliant telecom designs.
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 support, and guaranteed RoHS compliance.
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 ICs for communications, industrial, and automotive markets.
The DS2155GNB+ belongs to Maxim's telecom transceiver product line, designed specifically for carrier-class TDM infrastructure requiring multi-standard support, jitter resilience, and system-level diagnostic capability.
FAQ
What is the operating temperature range for DS2155GNB+?
The DS2155GNB+ is rated for operation from −40°C to +85°C, making it suitable for deployment in uncontrolled environments such as outdoor cabinets and central office shelves. This extended temperature range ensures reliable performance under thermal stress conditions common in telecom infrastructure, and is confirmed in Maxim's official ordering information table for the GN-series variants.
Does DS2155GNB+ support both T1 and E1 standards simultaneously?
No - the DS2155GNB+ operates in either T1 or E1 mode, selected via software configuration at initialization. While it cannot process both standards concurrently on the same channel, its software-selectable architecture allows dynamic reconfiguration during system boot or maintenance windows, enabling flexible deployment across mixed T1/E1 networks without hardware change.
What clock frequencies does DS2155GNB+ synthesize for the backplane interface?
The DS2155GNB+ synthesizes four fixed backplane clock frequencies: 16.384MHz, 8.192MHz, 4.096MHz, and 2.048MHz - all phase-locked to the recovered network clock. These match standard TDM sampling rates (e.g., 8.192MHz for 256-slot T1/E1 frames), eliminating the need for external clock generators and ensuring deterministic jitter performance.
Is DS2155GNB+ pin-compatible with DS2156?
Yes - the DS2155GNB+ is explicitly documented as pin and software compatible with the DS2156. This compatibility enables drop-in replacement in existing designs using DS2156, preserving PCB layout and firmware while upgrading to DS2155GNB+'s enhanced jitter attenuation and broader temperature range.
What termination impedances can be configured on DS2155GNB+?
The DS2155GNB+ supports software-selectable termination impedances of 75Ω, 100Ω, and 120Ω on both transmit and receive sides. This covers all major T1 (100Ω) and E1 (75Ω coax / 120Ω twisted pair) physical layer configurations, allowing one hardware design to serve multiple regional and media-specific deployments without resistor changes.
DS2155GNB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LFBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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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