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Analog Devices Inc./Maxim Integrated DS26303L-75+
- Part No.:
- DS26303L-75+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- -
- Datasheet:
-
DS26303L-75+.pdf
- Description:
- IC LIU E1/T1/J1 3.3V 144-ELQFP
- Quantity:
- Payment:
- Shipping:
Inventory:602
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Product details
Overview
DS26303L-75+ 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 and JTAG boundary scan.
For engineers reviewing the DS26303L-75+ datasheet, DS26303L-75+ pinout, DS26303L-75+ application, or DS26303L-75+ equivalent, this device serves as a drop-in octal LIU solution for telecom infrastructure requiring dual-rail/single-rail mode flexibility, AMI/HDB3/B8ZS encoding, nonintrusive G.772 monitoring, and hardware/software configurability across T1/E1/J1 standards.
Technical Context
The DS26303L-75+ implements eight independent LIUs with per-channel E1/T1/J1 selection, each featuring integrated transmit front-end with short-circuit protection and receive front-end with digital/analog loss-of-signal detection per T1.231, G.775, and ETS 300 233. Its on-chip synthesizer adapts external master clocks (e.g., 2.048MHz or 1.544MHz) to generate precise E1/T1/J1 rates without external crystals.
It supports both 8-bit parallel (Intel/Motorola modes) and 4-wire serial host interfaces, plus hardware mode configuration. Redundancy is enabled via configurable 1:1 or 1+1 backup with high-impedance fail-safe states and nonintrusive monitoring compliant with 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-simplifies power design and eliminates level shifters |
| Impedance | 75Ω default in E1 mode-matches standard coaxial E1 transmission lines |
| Encoding | Software-selectable AMI, HDB3 (E1), or B8ZS (T1)-ensures protocol-compliant line signaling |
| Jitter Attenuation | Crystal-less architecture with programmable bandwidth-reduces need for external clock clean-up circuitry |
| Compliance | ANSI T1.102, T1.231, T1.403, ITU-T G.703/G.742/G.775/G.823, ETS 300 166/233-meets global telecom line interface requirements |
| Built-in Diagnostics | On-chip BERT with PRBS/repetitive pattern generation and error detection-enables in-system link validation without external test gear |
Pinout & Package
DS26303L-75+ is housed in a 144-pin eLQFP package with exposed pad for thermal management and mechanical stability. Pin assignments are defined per Maxim's DS26303 datasheet Figure 4-1 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS / TNEG | Transmit differential output | Drives balanced 75Ω E1 line; supports short-circuit protection and power-down control |
| RPOS / RNEG | Receive differential input | Accepts E1/T1/J1 signals with peak detection, CDR, and LOS/AIS detection per standards |
| RTIP / RRING | Receiver analog tip/ring inputs | Enables analog loopback and supports G.772 nonintrusive monitoring |
| TTTIP / TRING | Transmitter analog tip/ring outputs | Provides analog transmit path for hybrid coupling and redundancy switching |
| RCLK | Recovered clock output | Delivers extracted clock from incoming signal for synchronous downstream processing |
| TCLK | Transmit clock input | Synchronizes transmit data; accepts master clock at multiples of 1.544MHz or 2.048MHz |
| MODESEL | Hardware mode select | Determines parallel/serial interface operation and bus timing configuration without software overhead |
| JTAG pins (TCK/TMS/TDI/TDO/TRST) | IEEE 1149.1 boundary scan | Enables production test, in-circuit debugging, and interconnect verification |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel protocol selection | Each of 8 LIUs can be individually set to E1, T1, or J1-enables mixed-protocol line cards without redesign |
| Internal software-selectable termination | Eliminates external resistors and jumpers; reduces BOM count and layout complexity |
| G.772 nonintrusive monitoring | Allows real-time line performance analysis without disrupting live traffic-critical for carrier-grade SLA assurance |
| HPS (Hitless Protection Switching) | Configurable 1:1 or 1+1 backup with zero-interruption switchover-meets telecom redundancy uptime requirements |
| Dual-rail and single-rail mode support | Enables flexible integration with legacy or modern PHY layers while maintaining signal integrity |
Applications
| T1 Digital Cross-Connect System | Wireless Base Station Backhaul |
|---|---|
Use Scenario: Aggregating and switching multiple T1 circuits between central office switches and remote nodes. IC Role / Device Role / Timing Role: Line interface unit providing physical layer framing, encoding, and clock recovery for T1 signals. Use Value: DS26303L-75+ delivers 8-channel T1 support with built-in AIS detection and BERT diagnostics-reducing test time and improving field reliability. |
Use Scenario: Connecting BTS equipment to microwave or fiber backhaul links using E1/T1 interfaces. IC Role / Device Role / Timing Role: Short-haul LIU handling E1/T1 line conditioning, jitter attenuation, and loss-of-signal monitoring. Use Value: DS26303L-75+ enables crystal-less operation and G.772 monitoring-lowering bill-of-materials cost and simplifying compliance testing. |
| E1/T1 Multiplexer | ISDN Primary Rate Interface |
Use Scenario: Consolidating up to 8 E1 or T1 streams into a higher-bandwidth transport link (e.g., STM-1 or Ethernet). IC Role / Device Role / Timing Role: Physical layer transceiver performing line encoding (HDB3/B8ZS), clock generation, and frame alignment. Use Value: DS26303L-75+ supports both E1 and T1 in same device with single 3.3V supply-minimizing design variants and inventory SKUs. |
Use Scenario: Providing PRI connectivity for enterprise PBX systems requiring 30B+D (E1) or 23B+D (T1) channels. IC Role / Device Role / Timing Role: Line interface managing D-channel signaling, B-channel data, and synchronization in ISDN access devices. Use Value: DS26303L-75+ integrates AIS generation/detection and digital loopback-accelerating PRI interoperability validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26502+ (Maxim) | 4-channel LIU; supports only T1/E1 (no J1); lacks built-in BERT and G.772 monitoring | Suitable for lower-density T1/E1 applications where full 8-channel capability and advanced diagnostics are not required | Select DS26502+ when reducing channel count and diagnostic depth lowers system cost without compromising core line interface function |
| SI53254-A01AGM (Skyworks) | Programmable clock generator with integrated jitter cleaning; no native LIU functionality-requires external line drivers/receivers | Used in clock distribution subsystems rather than direct line interfacing; not a functional replacement | Choose SI53254-A01AGM only when primary need is ultra-low-jitter clock synthesis-not line interface conversion or framing |
Compared with DS26303L-75+, DS26502+ offers half the channel density and fewer diagnostic features but lower power and cost; SI53254-A01AGM provides superior jitter performance but cannot replace DS26303L-75+'s integrated LIU functions-making it unsuitable for direct substitution in line card designs.
Availability
DS26303L-75+ is available at Aetrix Electronics and suitable for T1 digital cross-connects, wireless base station backhaul, and E1/T1 multiplexers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS26303L-75+ 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 DS26303L-75+ belongs to Maxim's telecom line interface product line, designed specifically for carrier-class E1/T1/J1 short-haul physical layer interfacing in digital cross-connects, multiplexers, and wireless infrastructure equipment.
FAQ
What is the operating temperature range for DS26303L-75+?
The DS26303L-75+ is rated for commercial temperature operation from 0°C to +70°C. This range is specified in the ordering information table of the official DS26303 datasheet and applies to all DS26303L-XXX+ variants. The device uses thermal characteristics defined in Table 9-1, with θJA = 27.5°C/W for the 144-pin eLQFP package.
Does DS26303L-75+ support both E1 and T1 protocols simultaneously?
Yes, DS26303L-75+ supports independent E1, T1, or J1 selection per channel. Each of its eight LIUs can be configured individually via register settings to operate in E1 (2.048Mbps), T1 (1.544Mbps), or J1 mode-enabling mixed-protocol line cards without hardware changes.
What termination impedance does DS26303L-75+ use in E1 mode?
In E1 mode, DS26303L-75+ defaults to 75Ω impedance, as indicated by the "-75" suffix in the part number. This matches standard E1 coaxial transmission lines and is confirmed in the Ordering Information section of the DS26303 datasheet.
Is DS26303L-75+ RoHS-compliant?
Yes, DS26303L-75+ is RoHS-compliant and lead-free, as denoted by the "+" suffix in the part number. The device meets EU Directive 2011/65/EU and is manufactured with green packaging per Maxim's environmental compliance documentation.
What host interface options does DS26303L-75+ provide?
DS26303L-75+ supports three host interface modes: 8-bit parallel (Intel or Motorola timing), 4-wire serial, and hardware mode configuration. These are detailed in Sections 4.1.1–4.1.4 of the DS26303 datasheet and allow flexible integration with diverse microcontroller and FPGA platforms.
DS26303L-75+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- -
- Number of Circuits:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DS26303L-75+ FAQ
1.How can I place an order for DS26303L-75+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303L-75+ 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-75+ reliable?
The price and inventory of DS26303L-75+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26303L-75+ is usually 5 days.
3.What payment methods are accepted for DS26303L-75+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303L-75+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303L-75+?
DS26303L-75+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303L-75+ 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-75+?
For technical support, including DS26303L-75+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303L-75+ requirements.
6.How does Aetrix verify that DS26303L-75+ is sourced from the original manufacturer or authorized distributors?
All DS26303L-75+ 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-75+ meets industry standards.
7.What is the process for return or replacement of DS26303L-75+?
All DS26303L-75+ units undergo pre-shipment inspection (PSI). If there is an issue with DS26303L-75+, 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-75+ part is unused and in its original packaging.
Return procedure for DS26303L-75+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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