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Analog Devices Inc./Maxim Integrated DS26303LN-75+A3
- Part No.:
- DS26303LN-75+A3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 144-LQFP Exposed Pad
- Datasheet:
-
DS26303LN-75+A3.pdf
- Description:
- IC TELECOM INTERFACE 144-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
DS26303LN-75+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 75Ω impedance in E1 mode and integrates BERT diagnostics for telecom infrastructure.
For engineers reviewing the DS26303LN-75+A3 datasheet, DS26303LN-75+A3 pinout, DS26303LN-75+A3 application, or DS26303LN-75+A3 equivalent, this device serves as a drop-in octal LIU solution for digital cross-connects, wireless base stations, and E1/T1 multiplexers requiring dual-rail/single-rail mode flexibility, AMI/HDB3/B8ZS encoding, and nonintrusive G.772 monitoring.
Technical Context
The DS26303LN-75+A3 implements eight independent LIUs with per-channel E1/T1/J1 selection, each featuring peak-detect/slicer-based receiver front-ends and programmable transmit templates compliant with T1.403 and G.703. Its on-chip synthesizer adapts external master clocks (e.g., 2.048MHz or 1.544MHz) to generate precise line rates without external crystals.
It supports hardware-mode configuration, 8-bit parallel (Intel/Motorola) or 4-wire serial host interfaces, and JTAG boundary scan per IEEE 1149.1. Redundancy is enabled via configurable 1:1 or 1+1 backup with high-impedance fail-safe states and nonintrusive monitoring per G.772.
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 with 5V-tolerant I/O-reduces power design complexity |
| Impedance | 75Ω default in E1 mode-matches standard coaxial E1 transmission lines |
| Encoding | Software-selectable AMI, HDB3 (E1), or B8ZS (T1/J1)-ensures protocol-specific line coding compliance |
| Jitter Attenuation | Crystal-less architecture with programmable bandwidth-eliminates external VCXO and reduces BOM count |
| Compliance | ANSI T1.102, T1.231, ITU-T G.703/G.742/G.823, ETS 300 233-certifies interoperability in carrier-grade systems |
| Built-in Diagnostics | On-chip BERT with PRBS/rep pattern generation and error detection-enables field-deployable link validation |
Pinout & Package
DS26303LN-75+A3 is housed in a 144-pin eLQFP package with exposed pad for thermal management and mechanical stability in telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS/TNEG | Transmit differential output | Drives balanced 75Ω E1 line with selectable amplitude and template per channel |
| RPOS/RNEG | Receive differential input | Accepts E1/T1/J1 signals with adaptive threshold and loss-of-signal detection per T1.231/G.775 |
| RTIP/RRING | Receiver analog interface | Supports external transformer coupling or direct connection to line interface circuitry |
| TTTIP/TRING | Transmitter analog interface | Enables external driver stage or direct connection with short-circuit protection |
| RCLK/TCLK | Receiver/transmit clock | Provides recovered or synthesized clock outputs for system timing synchronization |
| MODESEL | Hardware mode select | Determines parallel (Intel/Motorola) or serial host interface configuration at power-up |
| JTAG pins (TCK/TMS/TDI/TDO) | Boundary scan interface | Enables IEEE 1149.1-compliant test, debug, and in-system programming |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel E1/T1/J1 selection | Enables mixed-protocol operation across all 8 channels without external reconfiguration logic |
| Internal software-selectable termination | Eliminates need for external resistors or jumpers-reduces layout area and improves signal integrity |
| G.772 nonintrusive monitoring | Allows real-time line performance analysis without disrupting live traffic-critical for carrier SLA compliance |
| HPS redundancy support (1:1 or 1+1) | Provides hitless protection switching with automatic failover and high-impedance isolation during faults |
| Transmit short-circuit protection | Prevents damage during line faults or miswiring-enhances field reliability in unattended sites |
Applications
| T1 Digital Cross-Connects | Wireless Base Stations |
|---|---|
Use Scenario: Aggregating and switching multiple T1 trunks between central office and remote nodes. IC Role / Device Role / Timing Role: Octal LIU providing physical layer framing, clock recovery, and AIS generation for T1 transport. Use Value: Single-chip integration of 8 T1 interfaces reduces board space by >40% versus discrete solutions while maintaining ANSI T1.102 compliance. | Use Scenario: Backhaul connectivity between BTS and BSC using E1/T1 leased lines. IC Role / Device Role / Timing Role: Line interface handling E1 framing, jitter attenuation, and loss-of-signal detection per ETS 300 233. Use Value: Crystal-less jitter attenuator ensures stable timing under variable temperature conditions typical in outdoor enclosures. |
| E1/T1/J1 Multiplexer | ISDN Primary Rate Interface |
Use Scenario: Consolidating 30 E1 or 24 T1 channels into higher-speed SONET/SDH or Ethernet links. IC Role / Device Role / Timing Role: Short-haul LIU performing line encoding (HDB3/B8ZS), bipolar violation detection, and remote loopback control. Use Value: Built-in BERT enables automated channel-level diagnostics during provisioning-cutting commissioning time by ~30%. | Use Scenario: Providing PRI access for enterprise PBX systems over E1 (30B+D) or T1 (23B+D) lines. IC Role / Device Role / Timing Role: Physical layer transceiver managing D-channel signaling, AIS detection, and digital loss-of-signal per T1.231. Use Value: Dual-rail/single-rail mode support allows seamless migration between legacy and modern PRI implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26503LN+ (Maxim) | 12-channel LIU with extended E1/T1/J1 support and integrated clock generator; larger 160-pin eLQFP package | Targets higher-density mux/digital cross-connects where channel count exceeds 8 | Select DS26503LN+ when scaling beyond 8 channels or requiring tighter jitter specs (<0.2UI) |
| MC3489DR2G (ON Semiconductor) | Quad T1 LIU only; no E1/J1 support; requires external clock source and termination resistors | Suitable for cost-sensitive T1-only edge devices with lower channel density | Choose MC3489DR2G for T1-only designs where BOM cost is prioritized over integration and multi-protocol flexibility |
Compared with DS26303LN-75+A3, DS26503LN+ offers higher channel density and improved jitter performance but demands more PCB area and power; MC3489DR2G provides basic T1 functionality at lower cost but lacks E1/J1 support, internal termination, and jitter attenuation-making it unsuitable for carrier-grade E1 infrastructure.
Availability
DS26303LN-75+A3 is available at Aetrix Electronics and suitable for T1 digital cross-connects, wireless base station backhaul, and E1/T1 multiplexer applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for DS26303LN-75+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 high-performance analog, mixed-signal, and RF ICs for industrial, communications, and computing markets.
The DS26303 product line was designed for carrier-class telecom infrastructure, delivering multi-protocol short-haul line interface functionality with integrated diagnostics, redundancy, and jitter control in a single chip.
FAQ
What is the operating temperature range for DS26303LN-75+A3?
The DS26303LN-75+A3 is rated for industrial operation from -40°C to +85°C, making it suitable for deployment in outdoor wireless base stations and central office environments with wide ambient temperature swings. This extended range is confirmed in the Ordering Information table and supported by thermal characterization data in Section 9 of the official datasheet.
Does DS26303LN-75+A3 support both E1 and T1 protocols simultaneously?
Yes, DS26303LN-75+A3 supports independent E1, T1, or J1 selection per channel, enabling simultaneous operation across different protocols on the same device. Each of the eight LIUs can be configured individually via register settings, allowing mixed-mode applications such as E1 backhaul and T1 access on a single board without external protocol translation.
What clock frequencies does DS26303LN-75+A3 accept for its master clock input?
DS26303LN-75+A3 accepts external master clock inputs that are integer multiples of 2.048MHz (for E1) or 1.544MHz (for T1/J1), including common values like 8.192MHz, 12.288MHz, and 16.384MHz. The on-chip synthesizer automatically adapts these inputs to generate precise line-rate clocks, eliminating the need for separate crystal oscillators.
How does DS26303LN-75+A3 implement jitter attenuation without an external crystal?
DS26303LN-75+A3 uses an internal PLL-based jitter attenuator with programmable bandwidth (selectable via registers), which filters phase noise from the incoming master clock before generating clean line-rate clocks. This crystal-less architecture meets ITU-T G.823 jitter transfer requirements and avoids the cost, size, and reliability concerns associated with external VCXOs.
Is DS26303LN-75+A3 pin-compatible with other variants in the DS26303 family?
Yes, DS26303LN-75+A3 shares the same 144-pin eLQFP package and pinout with all DS26303L and DS26303LN variants, including DS26303L-075+, DS26303LN-120, and DS26303LN-120+. Impedance and temperature grade differences are handled internally, requiring no PCB layout changes when substituting within the family.
DS26303LN-75+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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LQFP-EP (20x20)
DS26303LN-75+A3 FAQ
1.How can I place an order for DS26303LN-75+A3 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303LN-75+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 DS26303LN-75+A3 reliable?
The price and inventory of DS26303LN-75+A3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26303LN-75+A3 is usually 5 days.
3.What payment methods are accepted for DS26303LN-75+A3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303LN-75+A3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303LN-75+A3?
DS26303LN-75+A3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303LN-75+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 DS26303LN-75+A3?
For technical support, including DS26303LN-75+A3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303LN-75+A3 requirements.
6.How does Aetrix verify that DS26303LN-75+A3 is sourced from the original manufacturer or authorized distributors?
All DS26303LN-75+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 DS26303LN-75+A3 meets industry standards.
7.What is the process for return or replacement of DS26303LN-75+A3?
All DS26303LN-75+A3 units undergo pre-shipment inspection (PSI). If there is an issue with DS26303LN-75+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 DS26303LN-75+A3 part is unused and in its original packaging.
Return procedure for DS26303LN-75+A3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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