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Analog Devices Inc./Maxim Integrated DS26303LN-120+
- Part No.:
- DS26303LN-120+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 144-LQFP Exposed Pad
- Datasheet:
-
DS26303LN-120+.pdf
- Description:
- IC TELECOM INTERFACE 144-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,982
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Product details
Overview
DS26303LN-120+ 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 dual-rail/single-rail mode selection, AMI/HDB3/B8ZS encoding/decoding, and built-in BERT for diagnostics in telecom infrastructure.
For engineers reviewing the DS26303LN-120+ datasheet, DS26303LN-120+ pinout, DS26303LN-120+ application, or DS26303LN-120+ equivalent, this page provides verified technical context, validated pin functions, real-world deployment scenarios, and confirmed alternative parts for E1/T1/J1 line interface design, redundancy planning, and jitter-sensitive timing systems.
Technical Context
The DS26303LN-120+ integrates eight independent LIUs with per-channel E1/T1/J1 protocol selection, each featuring peak-detect/slicer-based receiver front-end, PLL-based clock recovery, and configurable transmit templates per 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.
G.772 nonintrusive monitoring, hardware-mode configuration, and JTAG IEEE 1149.1 boundary scan enable in-system validation and field diagnostics. Redundancy is implemented via configurable 1:1 or 1+1 backup with high-impedance fail-safe states and loss-of-signal detection per T1.231, G.775, and ETS 300 233.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent LIUs-enables full octal E1/T1/J1 line aggregation without external channelization logic. |
| Supply Voltage | 3.3V ±5%-simplifies power architecture by eliminating dual-rail supplies required by legacy LIUs. |
| Line Impedance | 120Ω default (E1 mode)-matches standard balanced E1 twisted-pair cabling; no external impedance-matching components needed. |
| Jitter Attenuation | Crystal-less-removes external crystal oscillator and associated layout constraints while meeting G.823 wander tolerance. |
| Encoding Support | AMI, HDB3, B8ZS-software-selectable per channel to align with regional standards (E1: HDB3; T1: B8ZS). |
| Compliance | ANSI T1.102, ITU-T G.703/G.742/G.823, ETS 300 233-certifies interoperability in carrier-grade access equipment. |
| Interface | 8-bit parallel (Intel/Motorola) or 4-wire serial-supports legacy host MCU integration and space-constrained PCB layouts. |
Pinout & Package
DS26303LN-120+ is housed in a 144-pin eLQFP package with exposed thermal pad, optimized for telecom board thermal management and signal integrity in dense line-card designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS / TNEG | Transmit differential pair (per LIU) | Drives balanced 120Ω E1 line; supports ±2.5V swing compliant with G.703 Class I. |
| RPOS / RNEG | Receive differential pair (per LIU) | Accepts ±2.5V G.703-compliant input; includes adaptive threshold slicing and bipolar violation detection. |
| RLOS | Loss-of-signal indicator (per LIU) | Open-drain output asserting low when signal amplitude falls below T1.231/G.775 thresholds. |
| MODESEL | Hardware mode configuration input | Sets parallel/serial interface, Intel/Motorola bus timing, and reset behavior at power-up. |
| TCLK / RCLK | Transmit/receive clock reference outputs | Provides synchronized 2.048MHz/1.544MHz clocks for host processor or downstream timing distribution. |
| JTAG TCK/TMS/TDI/TDO | IEEE 1149.1 test access port | Enables boundary-scan testing, register visibility, and in-circuit programming without dedicated debug headers. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in BERT tester | Generates PRBS7/PRBS15/2047-bit patterns and detects errors on all 8 channels-eliminates need for external test gear during production burn-in. |
| Configurable 1:1 or 1+1 redundancy | Supports hitless protection switching (HPS) with automatic switchover and status reporting-meets carrier-grade 99.999% uptime requirements. |
| Software-selectable termination | Internal 75Ω or 120Ω termination per channel-reduces BOM count and eliminates manual resistor placement for multi-standard deployments. |
| Dual-rail/single-rail operation | Enables flexible analog front-end biasing-single-rail simplifies power delivery; dual-rail improves dynamic range for long-haul repeater interfaces. |
| AIS generation/detection | Fully compliant with T1.231 and ETS 300 233 AIS framing-ensures interoperability with legacy network elements during fault propagation. |
Applications
| Wireless Base Station Abis Interface | E1/T1 Digital Cross-Connect System |
|---|---|
Use Scenario: Connecting BTS to BSC over E1 links in GSM/UMTS macro base stations with strict jitter and LOS detection requirements. IC Role / Device Role / Timing Role: Line interface unit handling physical layer framing, clock recovery, and AIS signaling for Abis transport. Use Value: DS26303LN-120+'s 120Ω E1-optimized front-end and G.775-compliant LOS detection ensure stable link synchronization across temperature ranges (–40°C to +85°C). |
Use Scenario: Aggregating and switching multiple E1/T1 feeds in central office digital cross-connects requiring protocol flexibility and redundancy. IC Role / Device Role / Timing Role: Octal LIU providing independent channel-level termination, encoding, and HPS control for nonintrusive maintenance. Use Value: DS26303LN-120+ enables single-BOM support for E1/T1/J1 with software-selectable modes-reducing inventory complexity and qualification effort. |
| ISDN Primary Rate Interface (PRI) Gateway | ATM/Frame Relay Access Concentrator |
Use Scenario: Supporting 30-channel E1 PRI in enterprise voice gateways interfacing PBX systems with PSTN. IC Role / Device Role / Timing Role: Physical layer transceiver converting TDM time slots to/from serial bitstream with HDB3 encoding and AIS handling. Use Value: DS26303LN-120+'s integrated jitter attenuator meets G.823 mask for PRI clock stability without external VCXO, lowering system cost. |
Use Scenario: Front-ending ATM or Frame Relay edge routers connecting to carrier E1/T1 WAN links with BERT-assisted diagnostics. IC Role / Device Role / Timing Role: Short-haul line interface performing line coding, clock/data recovery, and loopback testing for service activation. Use Value: DS26303LN-120+'s on-chip BERT and remote loopback capability accelerate field commissioning and reduce truck rolls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal E1/T1 line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26504LN+ (Maxim) | 16-channel LIU; supports extended temperature (–40°C to +85°C); adds integrated echo cancellation and TDM bus interface. | Targeted at higher-density line cards and VoIP media gateways requiring TDM switching. | Select DS26504LN+ when scaling beyond 8 channels or requiring TDM bus connectivity; DS26303LN-120+ remains optimal for cost-sensitive 8-channel E1-only deployments. |
| MC3489DR2 (NXP) | Quad T1 LIU only; no E1/J1 support; requires dual 5V/3.3V supplies; lacks jitter attenuator and BERT. | Limited to T1-only legacy systems; no crystal-less operation or built-in diagnostics. | Choose MC3489DR2 only for brownfield T1-only upgrades where footprint compatibility with older NXP designs is mandatory. |
Compared with DS26303LN-120+, DS26504LN+ offers double channel count and TDM switching but increases complexity and cost, while MC3489DR2 sacrifices E1 support, jitter performance, and diagnostic capability-making DS26303LN-120+ the balanced choice for new 8-channel E1/T1/J1 infrastructure.
Availability
DS26303LN-120+ is available at Aetrix Electronics and suitable for wireless base station backhaul, digital cross-connect systems, and ISDN PRI gateways requiring stable component supply across industrial temperature ranges (–40°C to +85°C) and long lifecycle support.
Supply support for DS26303LN-120+ 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 power management ICs for communications, industrial, and computing markets.
The DS26303LN-120+ belongs to Maxim's telecom line interface product line, engineered specifically for carrier-class E1/T1/J1 short-haul transmission in space- and power-constrained access equipment.
FAQ
What is the operating temperature range for DS26303LN-120+?
The DS26303LN-120+ is rated for industrial operation from –40°C to +85°C, as indicated by the "LN" suffix in the part number. This makes it suitable for deployment in outdoor wireless base stations, central office line cards, and other telecom infrastructure where ambient temperatures exceed commercial grade limits. The device maintains full specification compliance-including jitter attenuation, LOS detection, and BERT functionality-across this entire range.
Does DS26303LN-120+ support both E1 and T1 protocols simultaneously?
Yes, DS26303LN-120+ supports independent E1, T1, or J1 operation per channel via software configuration. Each of its eight LIUs can be individually set to E1 (2.048Mbps), T1 (1.544Mbps), or J1 (1.544Mbps) mode, enabling mixed-protocol line cards-for example, four E1 and four T1 ports on a single device-without hardware changes or external multiplexers.
What master clock frequencies does DS26303LN-120+ accept?
DS26303LN-120+ accepts external master clocks that are integer multiples of 2.048MHz (for E1) or 1.544MHz (for T1/J1), such as 8.192MHz, 12.288MHz, or 16.384MHz. Its on-chip PLL synthesizes precise line-rate clocks internally, eliminating the need for separate crystal oscillators and reducing board area and component count.
How does DS26303LN-120+ implement nonintrusive monitoring per G.772?
DS26303LN-120+ implements G.772-compliant nonintrusive monitoring by sampling line signals through high-impedance taps without disrupting live traffic. It measures signal amplitude, jitter, BPV, and excessive zero density in real time and reports results via registers-enabling continuous health monitoring and predictive maintenance in carrier networks without service interruption.
Is DS26303LN-120+ RoHS-compliant and lead-free?
Yes, DS26303LN-120+ is RoHS-compliant and lead-free, as confirmed by the "+" suffix in the part number. It uses a lead-free eLQFP package with exposed thermal pad and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), supporting standard reflow soldering profiles for high-volume manufacturing.
DS26303LN-120+ 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-120+ FAQ
1.How can I place an order for DS26303LN-120+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303LN-120+ 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-120+ reliable?
The price and inventory of DS26303LN-120+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26303LN-120+ is usually 5 days.
3.What payment methods are accepted for DS26303LN-120+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303LN-120+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303LN-120+?
DS26303LN-120+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303LN-120+ 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-120+?
For technical support, including DS26303LN-120+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303LN-120+ requirements.
6.How does Aetrix verify that DS26303LN-120+ is sourced from the original manufacturer or authorized distributors?
All DS26303LN-120+ 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-120+ meets industry standards.
7.What is the process for return or replacement of DS26303LN-120+?
All DS26303LN-120+ units undergo pre-shipment inspection (PSI). If there is an issue with DS26303LN-120+, 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-120+ part is unused and in its original packaging.
Return procedure for DS26303LN-120+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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