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Analog Devices Inc./Maxim Integrated DS2155G+TR
- Part No.:
- DS2155G+TR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LFBGA, CSPBGA
- Datasheet:
-
DS2155G+TR.pdf
- Description:
- E1 SINGLE CHIP TRANSCEIVER
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
DS2155G+TR 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 programmable 75Ω/100Ω/120Ω termination, CMI coding for optical interfaces, and crystal-less jitter attenuation. Used in telecom line cards for synchronous TDM transport over legacy copper infrastructure.
For engineers reviewing the DS2155G+TR datasheet, DS2155G+TR pinout, DS2155G+TR application, or DS2155G+TR equivalent, key selection criteria include software-selectable T1/E1/J1 mode, dual elastic-store slip buffers for asynchronous backplane interfacing up to 16.384MHz, and integrated BERT generator/detector for in-system loop testing.
Technical Context
The DS2155G+TR implements a fully independent transmit and receive path with separate clock/data recovery, waveshaping, and termination control per interface standard. Its LIU supports G.703-compliant E1 waveforms for 75Ω coax and 120Ω twisted-pair, plus DSX-1 and CSU line buildouts (-7.5dB, -15dB, -22.5dB) for T1.
It features dual two-frame elastic-store slip buffers enabling connection to asynchronous backplanes, and a programmable backplane clock synthesizer generating 16.384MHz, 8.192MHz, 4.096MHz, or 2.048MHz outputs locked to the recovered network clock - critical for TDM timing integrity across mixed-clock domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| T1/E1/J1 Mode | Software-selectable via parallel port; enables single hardware design for multiple regional standards. |
| Line Interface | Integrated LIU with programmable termination (75Ω/100Ω/120Ω) and jitter attenuator - eliminates external clock cleanup ICs. |
| Backplane Clock | Synthesizes 16.384MHz/8.192MHz/4.096MHz/2.048MHz from recovered network clock - ensures deterministic TDM frame alignment. |
| HDLC Controllers | Dual independent HDLC controllers with FIFO-based packet handling - supports embedded signaling and data channel framing. |
| BIT Error Rate Test | On-chip BERT generator and detector with repetitive pattern support - enables in-field link validation without external test gear. |
| Elastic Stores | Dual two-frame slip buffers for asynchronous TDM backplane interfacing - absorbs clock domain mismatches up to ±100ppm. |
| Jitter Attenuation | Crystal-less architecture meeting ITU-T G.823/G.824 masks - meets carrier-grade timing stability without external VCXO. |
Pinout & Package
DS2155G+TR is housed in a 100-ball CSBGA (Chip Scale Ball Grid Array) package with 0.5mm pitch and 10mm × 10mm body size, optimized for high-density telecom PCB layouts and thermal performance in line card applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDI, TDO, TCK, TMS | JTAG Test Access Port | Enables boundary-scan testing and in-circuit programming of configuration registers. |
| TXP/N, RXP/N | Differential Line Transmit/Receive | Direct connection to transformer-coupled T1/E1 physical layer - supports both metallic and optical (CMI) modes. |
| CLKIN, CLKOUT | Reference Clock Input/Output | Accepts 1.544MHz (T1) or 2.048MHz (E1) reference; outputs synthesized backplane clocks. |
| DATA[7:0], ADDR[3:0] | 8-bit Parallel Control Bus | Intel/Motorola configurable interface for register access - supports legacy microcontroller integration. |
| RESET, INT | System Control Signals | Asynchronous reset and interrupt output for status reporting (e.g., AIS, LOF, CRC errors). |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable T1/E1/J1 operation | Single firmware image supports global deployment across North America, Europe, and Japan without hardware change. |
| Crystal-less jitter attenuator | Meets G.823 long-term jitter requirements without external crystal oscillator - reduces BOM count and layout area. |
| Programmable line termination | On-die 75Ω/100Ω/120Ω resistors selectable per interface - eliminates discrete termination networks and improves impedance matching accuracy. |
| Dual HDLC controllers | Independent transmit/receive HDLC engines with dedicated FIFOs - enables simultaneous CAS signaling and data channel framing. |
| Integrated BERT | Generates and detects PRBS patterns (2^15–1, 2^20–1) on both line and backplane paths - accelerates field commissioning and diagnostics. |
Applications
| Telecom Line Cards | Carrier-Grade Routers |
|---|---|
Use Scenario: Embedded in modular T1/E1 line interface cards for central office and remote terminal equipment. IC Role / Device Role / Timing Role: Primary TDM transceiver handling physical layer signaling, frame synchronization, and backplane data transfer. Use Value: Eliminates need for discrete framer + LIU + clock cleaner combinations - reduces component count by ≥40% versus multi-chip solutions. |
Use Scenario: Front-panel T1/E1 ports in edge routers supporting legacy circuit-switched voice and leased-line data services. IC Role / Device Role / Timing Role: Physical layer interface bridging PSTN/ISDN traffic into packet-switched backplane fabric. Use Value: Dual elastic stores absorb clock skew between line-side and switch-fabric domains - prevents frame slips during traffic bursts. |
| Add-Drop Multiplexers (ADMs) | Enterprise PBX Gateways |
Use Scenario: Channelized TDM grooming in SONET/SDH ADMs requiring per-channel CAS or CCS signaling. IC Role / Device Role / Timing Role: Channelized framer with HDLC-controlled signaling insertion/removal at DS0 level. Use Value: Hardware-based signaling engine offloads CPU and ensures sub-millisecond response to line alarms (e.g., RAI, AIS). |
Use Scenario: T1 PRI interface connecting legacy PBX systems to VoIP gateways or SIP trunking platforms. IC Role / Device Role / Timing Role: ISDN-PRI transceiver managing D-channel HDLC framing and B-channel PCM transport. Use Value: Integrated CMI coder/decoder supports direct optical interface - avoids external line driver for fiber drop applications. |
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+TR | Pin- and software-compatible successor with enhanced jitter tolerance and extended temperature range support. | Preferred for new designs requiring improved G.823 compliance margin and industrial temperature operation. | Select DS2156+TR when upgrading legacy DS2155G+TR designs for longer lifecycle or harsher thermal environments. |
| MC2021A | Single-function E1-only transceiver with fixed G.703 interface; lacks T1/J1 support and software configurability. | Suitable only for cost-sensitive E1-only deployments where multi-standard flexibility is unnecessary. | Choose MC2021A only if application is strictly E1, requires minimal feature set, and prioritizes lowest unit cost over future-proofing. |
Compared with DS2155G+TR, DS2156+TR offers tighter jitter attenuation and broader temp range but identical pinout and register map, while MC2021A sacrifices multi-standard capability for lower power and cost in E1-only use cases.
Availability
DS2155G+TR is available at Aetrix Electronics and suitable for telecom line cards, carrier-grade routers, add-drop multiplexers, and enterprise PBX gateways requiring stable component supply and long-term obsolescence management.
Supply support for DS2155G+TR 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 industrial, communications, and computing markets.
The DS2155G+TR belongs to Maxim's telecom transceiver product line, designed specifically for carrier-class TDM infrastructure requiring software-configurable, multi-standard, single-chip line interface solutions.
FAQ
What is the operating temperature range for DS2155G+TR?
The DS2155G+TR is rated for 0°C to +70°C ambient operation and is packaged in a lead-free 100-ball CSBGA. This commercial temperature grade suits indoor telecom equipment such as central office line cards and enterprise gateway platforms where environmental control is maintained. The DS2155G+TR does not support extended industrial temperature ranges - for -40°C to +85°C operation, the DS2155GN+TR variant must be selected.
Does DS2155G+TR support both T1 and E1 standards simultaneously?
No, the DS2155G+TR operates in one standard at a time - T1, E1, or J1 - selected via software configuration of its mode registers. While it cannot run T1 and E1 concurrently on the same device, its software-selectable architecture allows a single hardware design to be deployed globally by reprogramming the mode bits. This eliminates the need for separate SKUs or board revisions for regional variants.
What clock frequencies does DS2155G+TR generate for the TDM backplane?
The DS2155G+TR synthesizes four precise backplane clock frequencies - 16.384MHz, 8.192MHz, 4.096MHz, and 2.048MHz - all phase-locked to the recovered network clock. These correspond to common TDM frame rates: 16.384MHz supports full-rate DS1/E1 (24/32 channels × 8kHz), while lower frequencies enable fractional or subrate configurations. The clock output is jitter-cleaned and meets T1/E1 timing mask requirements.
How does DS2155G+TR handle line interface termination?
The DS2155G+TR integrates programmable termination resistors (75Ω, 100Ω, 120Ω) on both transmit and receive sides, selectable per interface standard via internal registers. This eliminates external resistor networks and improves impedance matching accuracy across temperature and voltage. Termination is applied directly at the LIU pins, minimizing stub length and signal integrity degradation in high-speed T1/E1 traces.
Is DS2155G+TR pin-compatible with other devices in the DS2155 family?
Yes, all DS2155 variants - including DS2155L+, DS2155LN+, and DS2155G+TR - share identical pinouts within their respective packages (LQFP or CSBGA). The DS2155G+TR is mechanically and electrically compatible with other CSBGA versions, differing only in temperature grade and RoHS compliance. However, it is not pin-compatible with LQFP-packaged variants due to different package footprints.
DS2155G+TR 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)
DS2155G+TR FAQ
1.How can I place an order for DS2155G+TR through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2155G+TR 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 DS2155G+TR reliable?
The price and inventory of DS2155G+TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2155G+TR is usually 5 days.
3.What payment methods are accepted for DS2155G+TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2155G+TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2155G+TR?
DS2155G+TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2155G+TR 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 DS2155G+TR?
For technical support, including DS2155G+TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2155G+TR requirements.
6.How does Aetrix verify that DS2155G+TR is sourced from the original manufacturer or authorized distributors?
All DS2155G+TR 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 DS2155G+TR meets industry standards.
7.What is the process for return or replacement of DS2155G+TR?
All DS2155G+TR units undergo pre-shipment inspection (PSI). If there is an issue with DS2155G+TR, 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 DS2155G+TR part is unused and in its original packaging.
Return procedure for DS2155G+TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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