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Analog Devices Inc./Maxim Integrated DS26303L-120+A3
- Part No.:
- DS26303L-120+A3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 144-LQFP Exposed Pad
- Datasheet:
-
DS26303L-120+A3.pdf
- Description:
- IC TELECOM INTERFACE 144-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,983
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Product details
Overview
DS26303L-120+A3 from Maxim Integrated is an 8-channel short-haul line interface unit (LIU) supporting E1/T1/J1 protocols on a single 3.3V supply, with internal software-selectable termination, crystal-less jitter attenuation, and compliance to ANSI T1.102, ITU-T G.703, and ETS 300 233. It delivers 120Ω impedance default in E1 mode and integrates on-chip synthesizer for clock generation from a single master clock input.
For engineers reviewing the DS26303L-120+A3 datasheet, DS26303L-120+A3 pinout, DS26303L-120+A3 application, or DS26303L-120+A3 equivalent, key selection considerations include E1/T1/J1 protocol flexibility per channel, dual-rail/single-rail mode support, AMI/HDB3/B8ZS encoding, nonintrusive G.772 monitoring, and built-in BERT diagnostics for field validation.
Technical Context
The DS26303L-120+A3 implements eight independent LIUs with configurable transmit/receive termination, selectable line encoding (AMI, HDB3, B8ZS), and digital/analog loss-of-signal detection per T1.231, G.775, and ETS 300 233. Its on-chip PLL-based synthesizer adapts external master clocks (e.g., multiples of 1.544MHz or 2.048MHz) to generate precise E1/T1/J1 frame and bit clocks.
It supports hardware mode configuration, 8-bit parallel (Intel/Motorola) or 4-wire serial host interface, JTAG boundary scan (IEEE 1149.1), and hitless-protection switching (HPS) with 1:1 or 1+1 backup. Transmit short-circuit protection and AIS detection/generation are implemented per telecom standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent E1/T1/J1 short-haul LIUs with per-channel protocol selection |
| Supply Voltage | Single 3.3V rail; I/O pins 5V tolerant-simplifies level-shifting in mixed-voltage systems |
| Impedance Default | 120Ω in E1 mode-matches standard E1 balanced twisted-pair cabling without external matching networks |
| Line Encoding | Software-selectable AMI, HDB3 (E1), or B8ZS (T1/J1)-ensures protocol-compliant signal integrity |
| Jitter Attenuation | Crystal-less architecture with programmable bandwidth-eliminates external crystal while meeting G.823 wander/jitter limits |
| Compliance | ANSI T1.102, T1.231, ITU-T G.703/G.742/G.775/G.823, ETS 300 166/233-certified for carrier-grade deployment |
| Built-in Diagnostics | On-chip BERT with PRBS7/15/20/23/31 and repetitive pattern generation-enables loopback testing without external test gear |
Pinout & Package
The DS26303L-120+A3 is housed in a 144-pin eLQFP package with exposed thermal pad, optimized for telecom board layouts requiring high-density integration and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS/TNEG | Transmit differential output | Drives balanced E1/T1/J1 line signals with programmable amplitude and template compliance |
| RPOS/RNEG | Receive differential input | Accepts ±3.5V peak-to-peak line signals with adaptive threshold slicing and bipolar violation detection |
| RTIP/RRING | Receiver analog tip/ring inputs | Supports direct connection to transformer-coupled or capacitive-coupled line interfaces |
| TTTIP/TRING | Transmitter analog tip/ring outputs | Enables transformerless short-haul transmission with internal DC bias control |
| RCLK | Recovered clock output | Provides clean, jitter-filtered clock derived from incoming line data for synchronous downstream processing |
| TCLK | Transmit clock input | Synchronizes transmit data timing; accepts programmable rates aligned to E1/T1/J1 frame structures |
| MODESEL | Hardware mode select | Determines parallel (Intel/Motorola) or serial host interface configuration at power-up |
| JTAG TCK/TMS/TDI/TDO | Boundary scan interface | Enables IEEE 1149.1-compliant PCB test, debug, and in-system programming |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel E1/T1/J1 selection | Each of 8 LIUs independently configured-supports mixed-protocol backplanes in multiplexers or routers |
| Internal software-selectable termination | Eliminates 16 external resistors per device-reduces BOM count and layout complexity |
| G.772 nonintrusive monitoring | Real-time line parameter measurement without disrupting live traffic-essential for network OAM |
| Hitless-protection switching (HPS) | Configurable 1:1 or 1+1 redundancy with sub-50ms switchover-meets carrier-grade SLA requirements |
| Single-rail/dual-rail mode | Reduces power consumption in low-traffic scenarios while maintaining full E1/T1/J1 functionality |
Applications
| T1 Digital Cross-Connects | ATM and Frame Relay Equipment |
|---|---|
Use Scenario: Aggregating and switching multiple T1 lines between central office and enterprise sites. IC Role / Device Role / Timing Role: Line interface unit providing physical layer framing, clock recovery, and AIS handling for each T1 span. Use Value: DS26303L-120+A3 enables 8-port T1 cross-connect density with integrated BERT and HPS-reducing system-level test time and improving fault resilience. | Use Scenario: Edge node termination for legacy ATM or Frame Relay access networks. IC Role / Device Role / Timing Role: Physical layer transceiver converting line signals to parallel/serial host data with precise T1.403-compliant timing. Use Value: DS26303L-120+A3 supports both AMI and B8ZS encoding and provides G.772 monitoring-critical for service-level assurance in packet-switched backhaul. |
| Wireless Base Stations | E1/T1/J1 Multiplexer and Channel Banks |
Use Scenario: Backhaul interface between BTS and BSC in macrocell deployments using E1/T1 links. IC Role / Device Role / Timing Role: Short-haul LIU delivering jitter-attenuated clock recovery and loss-of-signal detection per ITU-T G.775. Use Value: DS26303L-120+A3's crystal-less jitter attenuator meets G.823 mask requirements without external components-lowering bill-of-material cost and board space. | Use Scenario: Consolidating multiple E1/T1/J1 channels into higher-rate SONET/SDH or IP transport streams. IC Role / Device Role / Timing Role: Protocol-agnostic line interface with per-channel encoding and termination control for flexible channel mapping. Use Value: DS26303L-120+A3 allows single-BOM support across E1/T1/J1 variants-streamlining inventory and reducing qualification effort for multi-region deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26504N+ | 16-channel LIU, -40°C to +85°C industrial temp range, same 144-pin eLQFP package | Higher channel count; requires revised firmware and layout for doubled density | Choose DS26504N+ when scaling beyond 8 ports or operating in extended temperature environments |
| MAX3395E | Single-channel T1/E1 LIU, 32-pin QFN, no on-chip synthesizer or BERT | Lacks multi-channel integration, jitter attenuation, and diagnostic features | Choose MAX3395E only for low-channel-count, cost-sensitive designs where external clocking and test infrastructure exist |
Compared with DS26303L-120+A3, DS26504N+ offers double channel density and extended temperature operation but increases firmware complexity, while MAX3395E reduces integration and diagnostic capability-making DS26303L-120+A3 optimal for balanced 8-channel telecom edge applications requiring self-contained timing and testability.
Availability
DS26303L-120+A3 is available at Aetrix Electronics and suitable for T1 digital cross-connects, wireless base station backhaul, and E1/T1 multiplexers requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for DS26303L-120+A3 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 industrial, communications, and computing markets.
The DS26303L-120+A3 belongs to Maxim's telecom line interface product line, designed specifically for carrier-class short-haul E1/T1/J1 equipment requiring integrated timing, diagnostics, and protocol flexibility.
FAQ
What is the default impedance setting for DS26303L-120+A3 in E1 mode?
The DS26303L-120+A3 defaults to 120Ω impedance in E1 mode, as indicated by the "120" suffix in the part number. This matches standard balanced E1 transmission over 120Ω twisted-pair cabling and eliminates the need for external impedance-matching resistors in typical implementations.
Does DS26303L-120+A3 support both T1 and E1 protocols simultaneously across its 8 channels?
Yes, DS26303L-120+A3 supports independent E1, T1, or J1 selection per channel. Each of the eight LIUs can be individually configured via register settings to operate in any supported protocol, enabling mixed-mode operation-for example, four channels in E1 mode and four in T1 mode-within a single DS26303L-120+A3 device.
What clock frequencies does DS26303L-120+A3 accept for its master clock input?
DS26303L-120+A3 accepts an external master clock that is a multiple of either 2.048MHz (for E1) or 1.544MHz (for T1/J1). The on-chip synthesizer automatically adapts this input to generate precise E1/T1/J1 bit and frame clocks, eliminating the need for separate clock sources or external PLLs in the DS26303L-120+A3 design.
How does the built-in BERT in DS26303L-120+A3 assist in field diagnostics?
The DS26303L-120+A3 includes a fully integrated BERT supporting PRBS7/15/20/23/31 and repetitive patterns. It enables end-to-end line integrity verification-including error counting, pattern synchronization, and loopback path validation-without external test equipment, significantly accelerating commissioning and troubleshooting of DS26303L-120+A3-based telecom links.
Is DS26303L-120+A3 compatible with JTAG boundary scan for PCB testing?
Yes, DS26303L-120+A3 implements full IEEE 1149.1 JTAG boundary scan with TCK, TMS, TDI, and TDO pins. It supports EXTEST, HIGHZ, CLAMP, SAMPLE/PRELOAD, IDCODE, and BYPASS instructions-enabling automated PCB test, interconnect verification, and in-system programming during manufacturing and maintenance of DS26303L-120+A3-based assemblies.
DS26303L-120+A3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 144-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- LIU
- Number of Circuits:
- 8
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 250mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LQFP-EP (20x20)
DS26303L-120+A3 FAQ
1.How can I place an order for DS26303L-120+A3 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303L-120+A3 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 DS26303L-120+A3 reliable?
The price and inventory of DS26303L-120+A3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26303L-120+A3 is usually 5 days.
3.What payment methods are accepted for DS26303L-120+A3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303L-120+A3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303L-120+A3?
DS26303L-120+A3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303L-120+A3 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 DS26303L-120+A3?
For technical support, including DS26303L-120+A3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303L-120+A3 requirements.
6.How does Aetrix verify that DS26303L-120+A3 is sourced from the original manufacturer or authorized distributors?
All DS26303L-120+A3 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 DS26303L-120+A3 meets industry standards.
7.What is the process for return or replacement of DS26303L-120+A3?
All DS26303L-120+A3 units undergo pre-shipment inspection (PSI). If there is an issue with DS26303L-120+A3, 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 DS26303L-120+A3 part is unused and in its original packaging.
Return procedure for DS26303L-120+A3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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