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Analog Devices Inc./Maxim Integrated DS2155GB
- Part No.:
- DS2155GB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LFBGA, CSPBGA
- Datasheet:
-
DS2155GB.pdf
- Description:
- E1 SINGLE CHIP TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
DS2155GB 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. Used in carrier-grade line cards requiring multi-standard compliance and asynchronous backplane connectivity up to 16.384MHz.
For engineers reviewing the DS2155GB datasheet, DS2155GB pinout, DS2155GB application, or DS2155GB equivalent, this page delivers verified technical context on T1/E1/J1 waveform generation (G.703, DSX-1), elastic-store slip buffering, BERT functionality, and Intel/Motorola bus-compatible parallel control port configuration.
Technical Context
The DS2155GB implements independent transmit and receive paths with full T1 (1.544Mbps), E1 (2.048Mbps), and J1 (1.544Mbps) framing and signaling support. Its LIU includes G.703-compliant waveshaping for 75Ω coax and 120Ω twisted-pair, plus DSX-1 line buildouts (-7.5dB, -15dB, -22.5dB) and crystal-less jitter attenuation meeting ITU-T G.823/G.824.
It features dual two-frame elastic-store buffers for asynchronous TDM backplane interfacing, programmable BERT generator/detector, and internal clock synthesis delivering 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz outputs locked to recovered network clock - all configurable via 8-bit parallel port supporting both Intel and Motorola bus timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 1.544Mbps (T1/J1) or 2.048Mbps (E1); enables direct interface to legacy telecom infrastructure without external rate adaptation. |
| Jitter Attenuation | Crystal-less architecture meeting ITU-T G.823/G.824; eliminates need for external crystal oscillator and reduces board space/cost. |
| Termination Resistors | Software-selectable 75Ω, 100Ω, or 120Ω on transmit/receive sides; supports mixed-media deployments (coax/twisted-pair) without hardware changes. |
| Backplane Clock | Synthesizes 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz from recovered network clock; ensures deterministic TDM timing across asynchronous backplanes. |
| HDLC Controllers | Dual independent HDLC controllers with FIFO-based packet handling; supports simultaneous D-channel signaling and data channel framing in ISDN-PRI applications. |
| Line Buildouts | T1: DSX-1 and CSU buildouts (-7.5dB, -15dB, -22.5dB); E1: G.703-compliant pulse templates for 75Ω/120Ω; meets regional physical layer requirements. |
| BERT Function | Programmable bit-error-rate tester with repetitive pattern generation and error detection; enables in-system link validation without external test equipment. |
Pinout & Package
DS2155GB is housed in a 100-ball Chip-Scale Ball Grid Array (CSBGA) package with 0.5mm pitch and 10mm × 10mm body size, optimized for high-density telecom line card layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDI, TDO, TCK, TMS | JTAG Test Access Port | Enables boundary-scan testing and in-circuit programming per IEEE 1149.1; required for production test and debug of multi-device boards. |
| TXP/N, RXP/N | Differential Line Interface Outputs/Inputs | Drive/receive balanced T1/E1 signals; support AC-coupled 75Ω coax or 120Ω twisted-pair with integrated termination selection. |
| CLKOUT[3:0] | Backplane Clock Outputs | Four programmable clock outputs (16.384/8.192/4.096/2.048MHz) synchronized to recovered network clock; feed TDM switch fabric or DSPs. |
| DATA[7:0], ADDR[3:0], RD, WR, CS | 8-bit Parallel Control Port | Configurable for Intel (RD/WR strobes) or Motorola (E clock) bus timing; provides register-level access to all functional blocks. |
| TXCLK, RXCLK, FS | TDM Backplane Interface Clocks | Support asynchronous TDM bus operation up to 16.384MHz frame sync; enable elastic-store buffering between network and backplane domains. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 mode | Single firmware image supports all three standards; eliminates need for multiple SKUs or hardware variants in multi-region deployments. |
| Dual elastic-store slip buffers | Two-frame depth per channel handles ±100ppm frequency offset between network and backplane clocks; prevents data loss during clock domain crossing. |
| Internal CMI coder/decoder | Integrated Code Mark Inversion logic enables direct optical interface without external line coding IC; reduces component count and jitter accumulation. |
| Programmable receive/transmit termination | On-die 75Ω/100Ω/120Ω resistors selectable per channel via register write; avoids manual resistor swaps during system qualification or field reconfiguration. |
| Legacy FDL support (T1) | Full D4/SLC-96 framing and facility data link handling; maintains compatibility with older T1 network elements and maintenance systems. |
Applications
| Carrier T1/E1 Line Cards | Multi-Standard Add-Drop Multiplexers |
|---|---|
Use Scenario: High-density line cards in central office switches supporting mixed T1 and E1 traffic across North America and Europe. IC Role / Device Role / Timing Role: Primary T1/E1 transceiver providing physical layer interface, framing, HDLC signaling, and jitter-cleaned backplane clocking. Use Value: Single-chip integration reduces BOM cost by ~35% vs. discrete LIU+framer+HDLC solution while maintaining ITU-T G.703/G.704 compliance. |
Use Scenario: ADM platforms aggregating DS0 channels from diverse regional networks into SONET/SDH transport layers. IC Role / Device Role / Timing Role: Dual-mode transceiver enabling dynamic reconfiguration between T1 and E1 tributaries without hardware change. Use Value: Software-selectable standard mode and elastic-store buffering allow seamless interworking between asynchronous T1/E1 feeds and synchronous OC-3/STM-1 backbones. |
| ISDN-PRI Voice Gateways | Ruggedized Router WAN Interfaces |
Use Scenario: Enterprise voice gateways terminating PRI circuits for PBX integration with SIP trunking. IC Role / Device Role / Timing Role: Full ISDN-PRI transceiver handling B-channel payload, D-channel HDLC framing, and Layer 1 timing recovery. Use Value: Dual HDLC controllers and programmable signaling insertion registers eliminate need for external protocol processors in cost-sensitive gateway designs. |
Use Scenario: Industrial routers deployed in utility substations requiring E1 connectivity with extended temperature operation. IC Role / Device Role / Timing Role: E1 line interface with -40°C to +85°C rated DS2155GN variant (pin-compatible with DS2155GB) and robust jitter tolerance. Use Value: Crystal-less jitter attenuator and G.703-compliant waveshaping ensure reliable operation under electromagnetic interference common in substation environments. |
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; lead-free RoHS-compliant. | Preferred for prototyping and low-volume PCB assembly where reworkability and visual inspection are prioritized over density. | Select DS2155L+ when board layout allows larger footprint and thermal management favors exposed pad LQFP over compact CSBGA. |
| DS2155GN | Same CSBGA-100 package as DS2155GB but rated for -40°C to +85°C industrial temperature range (vs. 0°C to +70°C). | Required for outdoor or uncontrolled-environment deployments where ambient temperature exceeds commercial grade limits. | Choose DS2155GN when operating environment exceeds 70°C ambient or requires extended thermal reliability per Telcordia GR-468. |
Compared with DS2155GB, DS2155L+ offers easier assembly and debugging at the cost of board area, while DS2155GN extends operational range without altering signal integrity or feature set - making both viable alternatives depending on mechanical, thermal, and production constraints.
Availability
DS2155GB is available at Aetrix Electronics and suitable for carrier-grade line cards, multi-standard add-drop multiplexers, and ISDN-PRI voice gateways requiring stable component supply and long-term lifecycle support.
Supply support for DS2155GB 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 solutions for communications, computing, and industrial markets.
The DS2155GB belongs to Maxim's telecom transceiver product line, designed specifically for carrier-class T1/E1/J1 line interface applications demanding multi-standard flexibility, jitter resilience, and integration density in space-constrained line cards.
FAQ
What is the operating temperature range for DS2155GB?
The DS2155GB is specified for commercial temperature operation from 0°C to +70°C. This range aligns with typical indoor telecom equipment environments such as central office shelves and enterprise router chassis. For extended temperature applications, the DS2155GN variant (–40°C to +85°C) shares identical pinout and functionality with DS2155GB but is qualified for harsher thermal conditions.
Does DS2155GB support both T1 and E1 standards simultaneously?
No - the DS2155GB operates in either T1/E1/J1 mode at any given time, selected via software configuration of the master mode register. However, it supports full feature sets for each standard (e.g., G.703 waveshaping for E1, DSX-1 buildouts for T1), and mode switching can be performed dynamically in-system without hardware change or reset.
What package type is used for DS2155GB?
The DS2155GB uses a 100-ball Chip-Scale Ball Grid Array (CSBGA) package with 0.5mm ball pitch and a 10mm × 10mm body size. This compact, thermally efficient package supports high-density routing and is compatible with standard SMT reflow profiles for lead-free assembly.
How does the crystal-less jitter attenuator in DS2155GB meet ITU-T standards?
The DS2155GB's crystal-less jitter attenuator meets ITU-T G.823 (T1) and G.824 (E1) masks by using an internal PLL with adaptive loop bandwidth and digital filtering. It achieves <1.5UI peak-to-peak jitter at the output clock while accepting up to 20ppm frequency deviation and ±200ns jitter on the incoming line signal - verified per Figure 24-9 and Figure 24-10 in the official datasheet.
Is DS2155GB pin-compatible with other devices in the DS2155 family?
Yes - all DS2155 variants (including DS2155GB, DS2155GN, DS2155L+, DS2155LN+) share identical pinouts within their respective package types (CSBGA or LQFP). The DS2155GB and DS2155GN are fully interchangeable in CSBGA layouts, differing only in temperature rating and screening - enabling drop-in replacement for thermal upgrades.
DS2155GB 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-CSBGA (10x10)
DS2155GB FAQ
1.How can I place an order for DS2155GB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2155GB 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 DS2155GB reliable?
The price and inventory of DS2155GB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2155GB is usually 5 days.
3.What payment methods are accepted for DS2155GB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2155GB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2155GB?
DS2155GB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2155GB 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 DS2155GB?
For technical support, including DS2155GB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2155GB requirements.
6.How does Aetrix verify that DS2155GB is sourced from the original manufacturer or authorized distributors?
All DS2155GB 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 DS2155GB meets industry standards.
7.What is the process for return or replacement of DS2155GB?
All DS2155GB units undergo pre-shipment inspection (PSI). If there is an issue with DS2155GB, 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 DS2155GB part is unused and in its original packaging.
Return procedure for DS2155GB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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