My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS26303LN-120+A3
- Part No.:
- DS26303LN-120+A3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 144-LQFP Exposed Pad
- Datasheet:
-
DS26303LN-120+A3.pdf
- Description:
- IC TELECOM INTERFACE 144-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS26303LN-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, 120Ω impedance default for E1 mode, crystal-less jitter attenuation, and compliance to ANSI T1.102, ITU-T G.703, and ETS 300 233. It serves in telecom multiplexers and wireless base stations requiring multi-standard line interfacing.
For engineers reviewing the DS26303LN-120+A3 datasheet, DS26303LN-120+A3 pinout, DS26303LN-120+A3 application, or DS26303LN-120+A3 equivalent, key selection considerations include E1/T1/J1 protocol flexibility, 144-pin eLQFP package with exposed pad, dual-rail/single-rail mode support, HDB3/B8ZS encoding, and nonintrusive G.772 monitoring capability.
Technical Context
The DS26303LN-120+A3 integrates eight independent LIUs with per-channel E1/T1/J1 selection, each featuring programmable transmit/receive termination and configurable line encoding (HDB3 for E1, B8ZS for T1). Its on-chip synthesizer adapts external master clocks (e.g., 2.048MHz or 1.544MHz) to generate precise line rates without external crystals.
It implements digital/analog loss-of-signal detection per T1.231, G.775, and ETS 300 233, supports AIS detection/generation, and provides built-in BERT with PRBS-20 pattern generation. JTAG boundary scan (IEEE 1149.1) enables production testability, while hardware mode and 8-bit parallel/4-wire serial host interfaces simplify system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent LIUs, enabling simultaneous E1/T1/J1 line interfacing without external multiplexing. |
| Supply Voltage | Single 3.3V rail with 5V-tolerant I/O, reducing power supply complexity in mixed-voltage telecom systems. |
| Impedance Default | 120Ω for E1 mode-matches standard E1 balanced twisted-pair cabling and eliminates manual resistor configuration. |
| Line Encoding | HDB3 (E1) and B8ZS (T1/J1) support-ensures standards-compliant signal integrity and error detection. |
| Jitter Attenuation | Crystal-less architecture with programmable bandwidth-removes need for external VCXO and simplifies clock tree design. |
| Compliance | ANSI T1.102, ITU-T G.703/G.742/G.823, ETS 300 166/233-validates interoperability in carrier-grade infrastructure. |
| Host Interface | 8-bit parallel (Intel/Motorola modes) or 4-wire serial-offers layout flexibility and reduced PCB trace count vs. legacy parallel buses. |
Pinout & Package
DS26303LN-120+A3 is housed in a 144-pin enhanced LQFP (eLQFP) package with exposed thermal pad, optimized for thermal dissipation in high-density telecom line cards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS/TNEG | Transmit differential output | Drives balanced E1/T1/J1 line signals with selectable amplitude and template compliance. |
| RPOS/RNEG | Receive differential input | Accepts industry-standard line signals with adaptive threshold and jitter-tolerant CDR. |
| RTIP/RRING | Receiver analog front-end | Supports both transformer-coupled and capacitive-coupled line connections with DC offset compensation. |
| TTTIP/TRING | Transmitter analog front-end | Enables internal termination switching and short-circuit protection per channel. |
| RCLK | Recovered clock output | Provides clean, jitter-filtered clock derived from incoming line data for synchronous downstream processing. |
| MODESEL | Hardware configuration select | Determines parallel/serial interface mode and bus endianess without firmware initialization. |
| JTAG TCK/TMS/TDI/TDO | Boundary scan control | Enables IEEE 1149.1-compliant testing and debug during manufacturing and field service. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel E1/T1/J1 selection | Eliminates fixed-protocol constraints-each of eight LIUs can operate independently under different standards. |
| Software-selectable termination | Reduces BOM count by replacing external resistor networks with register-controlled 75Ω/120Ω internal termination. |
| G.772 nonintrusive monitoring | Enables real-time line health assessment without disrupting live traffic-critical for carrier-grade SLA monitoring. |
| Built-in BERT with PRBS-20 | Accelerates field diagnostics and production test by embedding full-pattern generation/detection logic on-die. |
| Configurable single/dual-rail mode | Supports legacy dual-supply designs or modern single-rail architectures-improves design reuse across product generations. |
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: Line interface unit providing physical layer framing, clock recovery, and AIS handling for each T1 span. Use Value: Single-chip octal integration reduces component count and board space versus discrete LIU solutions. | Use Scenario: Backhaul connectivity between BTS and BSC using E1 or T1 leased lines. IC Role / Device Role / Timing Role: Short-haul line driver/receiver with jitter attenuation and loss-of-signal detection for reliable fronthaul timing. Use Value: Crystal-less jitter attenuation maintains sync stability without external oscillators in temperature-variable outdoor enclosures. |
| E1/T1/J1 Multiplexer | ISDN Primary Rate Interface |
Use Scenario: Combining 30/24 voice/data channels into standardized E1/T1 frames for transport over copper. IC Role / Device Role / Timing Role: Protocol-transparent LIU supporting HDB3/B8ZS encoding and frame alignment for multiplexed traffic. Use Value: Internal termination and software-configurable templates eliminate per-line external components and calibration. | Use Scenario: Connecting PBX or enterprise routers to ISDN PRI lines delivering 30B+D (E1) or 23B+D (T1) services. IC Role / Device Role / Timing Role: Physical layer transceiver handling D-channel signaling, B-channel payload, and layer-1 alarms (AIS, RAI). Use Value: Integrated AIS generation and detection ensures rapid fault isolation and automated failover in mission-critical voice networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line interface unit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26504LN+ | Quad-channel LIU with identical 144-pin eLQFP package and E1/T1/J1 support; lacks built-in BERT and G.772 monitoring. | Suitable for lower-density line cards where channel count and diagnostic depth are less critical. | Select when BOM cost reduction outweighs need for on-chip diagnostics and monitoring. |
| MAX3675A | Single-channel T1/E1 LIU in 48-pin TQFP; supports only T1/E1 (no J1); no internal synthesizer-requires external clock IC. | Fits space-constrained designs needing one or two channels, but increases system-level clock management complexity. | Choose for incremental upgrades or low-channel-count edge devices where footprint is primary constraint. |
Compared with DS26303LN-120+A3, DS26504LN+ offers half the channel density with reduced diagnostic capability, while MAX3675A trades integration for smaller footprint and higher external component count-making DS26303LN-120+A3 optimal for high-channel, carrier-grade multiplexers requiring self-test and standards compliance.
Availability
DS26303LN-120+A3 is available at Aetrix Electronics and suitable for T1/E1/J1 multiplexers, wireless base station backhaul, and ISDN PRI gateways requiring stable component supply across extended temperature ranges (-40°C to +85°C) and RoHS-compliant packaging.
Supply support for DS26303LN-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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for telecom, industrial, and automotive markets.
The DS26303LN-120+A3 belongs to Maxim's telecom line interface portfolio, engineered specifically for carrier-class E1/T1/J1 short-haul transmission in digital cross-connects, multiplexers, and base station infrastructure.
FAQ
What is the operating temperature range for DS26303LN-120+A3?
The DS26303LN-120+A3 is rated for industrial operation from -40°C to +85°C, as indicated by the "LN" suffix in the part number. This extended range supports deployment in uncontrolled environments such as outdoor wireless base stations and central office cabinets without active cooling. The device maintains full specification compliance-including jitter performance, LOS detection thresholds, and termination accuracy-across this entire range.
Does DS26303LN-120+A3 support both E1 and T1 protocols simultaneously?
Yes, DS26303LN-120+A3 supports concurrent E1 and T1 operation across its eight independent LIUs. Each channel can be individually configured via register settings for E1 (2.048Mbps, HDB3), T1 (1.544Mbps, B8ZS), or J1 (1.544Mbps, B8ZS) mode. This enables mixed-protocol line cards-for example, four E1 ports for European trunking and four T1 ports for North American interconnect-without external protocol conversion.
What does the "+" suffix in DS26303LN-120+A3 signify?
The "+" suffix in DS26303LN-120+A3 indicates a lead-free, RoHS-compliant version with matte tin finish on all leads and an exposed pad compatible with standard Pb-free reflow profiles. It also confirms qualification to JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), ensuring robust manufacturability in high-volume SMT assembly lines without special baking requirements.
How does DS26303LN-120+A3 handle clock generation without an external crystal?
DS26303LN-120+A3 uses an on-chip PLL-based synthesizer that accepts a single master clock input (e.g., 2.048MHz for E1 or 1.544MHz for T1) and internally generates all required line-rate clocks, frame clocks, and receive clock outputs. Its crystal-less jitter attenuator filters incoming clock jitter to meet G.823 mask requirements, eliminating the need for external VCXOs or clock cleaners in most short-haul applications.
Can DS26303LN-120+A3 perform loopback testing without external hardware?
Yes, DS26303LN-120+A3 supports three integrated loopback modes: analog (transmit path to receiver input), digital (post-encoding to pre-decoding), and remote (via AIS-triggered far-end loopback). These are fully controlled through registers and require no external jumpers or test fixtures-enabling automated production testing and remote field diagnostics directly through the host processor interface.
DS26303LN-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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LQFP-EP (20x20)
DS26303LN-120+A3 FAQ
1.How can I place an order for DS26303LN-120+A3 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303LN-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 DS26303LN-120+A3 reliable?
The price and inventory of DS26303LN-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 DS26303LN-120+A3 is usually 5 days.
3.What payment methods are accepted for DS26303LN-120+A3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303LN-120+A3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303LN-120+A3?
DS26303LN-120+A3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303LN-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 DS26303LN-120+A3?
For technical support, including DS26303LN-120+A3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303LN-120+A3 requirements.
6.How does Aetrix verify that DS26303LN-120+A3 is sourced from the original manufacturer or authorized distributors?
All DS26303LN-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 DS26303LN-120+A3 meets industry standards.
7.What is the process for return or replacement of DS26303LN-120+A3?
All DS26303LN-120+A3 units undergo pre-shipment inspection (PSI). If there is an issue with DS26303LN-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 DS26303LN-120+A3 part is unused and in its original packaging.
Return procedure for DS26303LN-120+A3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS26303LN-120+A3 Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
-
VSC8531XMW-02
Microchip Technology
-
VSC8531XMW-05
Microchip Technology
-
GPY115C0VI
MaxLinear, Inc.
-
SI32185-A-FMR
Skyworks Solutions Inc.
-
VSC8541XMV-05
Microchip Technology
-
SI32178-B-FM1R
Skyworks Solutions Inc.
-
GPY215C0VI
MaxLinear, Inc.
-
CPC7514ZTR
Littelfuse Inc.
-
VSC8502XML-03
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
