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Analog Devices Inc./Maxim Integrated DS26303L-120+
- Part No.:
- DS26303L-120+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 144-LQFP Exposed Pad
- Datasheet:
-
DS26303L-120+.pdf
- Description:
- IC TELECOM INTERFACE 144-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
DS26303L-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, 120Ω impedance default for E1 mode, crystal-less jitter attenuation, and IEEE 1149.1 JTAG boundary scan. It serves in T1/E1 multiplexers and wireless base station line cards.
For engineers reviewing the DS26303L-120+ datasheet, DS26303L-120+ pinout, DS26303L-120+ application, or DS26303L-120+ equivalent, key selection considerations include E1/T1/J1 protocol flexibility per channel, dual-rail/single-rail transmit mode support, AMI/HDB3/B8ZS encoding, G.772 nonintrusive monitoring, and built-in BERT diagnostics.
Technical Context
The DS26303L-120+ integrates eight independent LIUs with configurable transmit/receive termination and supports simultaneous E1 (2.048MHz), T1 (1.544MHz), and J1 line rates via an on-chip synthesizer driven by a single master clock. Each channel operates with selectable line encoding (AMI, HDB3, or B8ZS) and complies with ANSI T1.102, ITU-T G.703, G.775, and ETS 300 233.
It implements digital/analog loss-of-signal detection per T1.231/G.775/ETS 300 233, AIS generation/detection, bipolar violation monitoring, and hitless-protection switching (HPS) with 1:1 or 1+1 backup configurations. The device provides hardware mode control, 8-bit parallel (Intel/Motorola) or 4-wire serial host interface, and transmit short-circuit protection.
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 for legacy system interfacing |
| Impedance Default | 120Ω for E1 mode (per ordering suffix -120); supports external 75Ω termination |
| Line Encoding | Software-selectable AMI, HDB3 (E1), or B8ZS (T1/J1) transmit/receive |
| Jitter Attenuation | Crystal-less jitter attenuator with programmable bandwidth per ITU-T G.823 |
| Compliance | Fully compliant with ANSI T1.102, T1.231, ITU-T G.703/G.742/G.775/G.823, ETS 300 166/233 |
| Host Interface | 8-bit parallel (Intel/Motorola modes) or 4-wire serial; JTAG boundary scan per IEEE 1149.1 |
Pinout & Package
DS26303L-120+ is housed in a 144-pin eLQFP package with exposed thermal pad, optimized for telecom line card density and thermal dissipation in multi-channel systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TPOS/TNEG | Transmit differential output | Drives balanced E1/T1/J1 line; supports 120Ω or 75Ω termination |
| RPOS/RNEG | Receive differential input | Accepts line signals with digital/analog LOS detection per T1.231/G.775 |
| RTIP/RRING | Receiver analog tip/ring inputs | Enables analog LOS monitoring and G.772 nonintrusive monitoring |
| TTTIP/TRING | Transmitter analog tip/ring outputs | Supports analog loopback and hybrid interface for legacy telephony systems |
| RCLK | Recovered clock output | Provides retimed clock synchronized to incoming data for downstream timing recovery |
| MODESEL | Hardware mode select | Determines parallel vs. serial host interface and Intel vs. Motorola bus timing |
| JTAG_TCK/TMS/TDI/TDO | JTAG test access port | Enables IEEE 1149.1 boundary scan for production testing and debug |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel E1/T1/J1 selection | Enables mixed-protocol line cards without external multiplexing logic |
| Internal software-selectable termination | Reduces BOM count and PCB footprint by eliminating discrete termination resistors |
| Built-in BERT tester | Allows in-system bit-error-rate validation without external test equipment |
| G.772 nonintrusive monitoring | Supports live line diagnostics without disrupting active traffic or requiring loopbacks |
| Hitless-protection switching (HPS) | Enables 1:1 or 1+1 redundancy with zero service interruption during failover |
Applications
| T1 Digital Cross-Connects | Wireless Base Stations |
|---|---|
Use Scenario: Aggregating and switching multiple T1 feeds 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 board area and power versus discrete LIU solutions while maintaining ANSI T1.102 compliance. | Use Scenario: Backhaul connectivity between BTS and BSC using E1 or T1 leased lines. IC Role / Device Role / Timing Role: Short-haul LIU managing line coding, jitter attenuation, and loss-of-signal detection per link. Use Value: Crystal-less jitter attenuation meets ITU-T G.823 mask requirements without external VCXO, simplifying timing subsystem design. |
| E1/T1/J1 Multiplexer | ISDN Primary Rate Interface |
Use Scenario: Consolidating up to eight E1/T1/J1 streams into a higher-speed SONET/SDH or packet-based transport. IC Role / Device Role / Timing Role: Physical layer transceiver with per-channel encoding control (HDB3/B8ZS/AMI) and clock synthesis. Use Value: Unified bill-of-materials across E1/T1/J1 variants lowers inventory complexity and enables field-reprogrammable line standards. | Use Scenario: Providing 30B+D (E1) or 23B+D (T1) PRI interfaces in enterprise PBX or media gateways. IC Role / Device Role / Timing Role: LIU delivering B-channel framing, D-channel signaling, and robust AIS/LOS handling. Use Value: Integrated AIS generation and detection per ETS 300 233 ensures interoperability with legacy ISDN switches and network management systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26504L-120+ | 4-channel LIU; same 144-pin eLQFP package and 3.3V supply but half channel count | Suitable for lower-density line cards where space or cost constraints limit full octal deployment | Select when fewer than eight E1/T1 links are required and board real estate is constrained |
| MAX3010E | Single-channel E1 LIU; no T1/J1 support; different 48-pin TQFP package; lacks JTAG and BERT | Targeted at cost-sensitive, low-channel-count E1-only applications without diagnostic or redundancy features | Choose only for simple E1 point-to-point links where G.772 monitoring, HPS, or multi-protocol flexibility are unnecessary |
Compared with DS26303L-120+, DS26504L-120+ offers identical feature depth at half channel density and reduced pin count, while MAX3010E sacrifices protocol flexibility, diagnostics, and redundancy to achieve lower unit cost and smaller footprint for dedicated E1 use cases.
Availability
DS26303L-120+ is available at Aetrix Electronics and suitable for T1/E1 multiplexers, wireless base station backhaul, digital cross-connects, and ISDN PRI gateways requiring stable component supply and long-term industrial availability.
Supply support for DS26303L-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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, communications, and computing markets.
The DS26303L-120+ belongs to Maxim's telecom line interface product line, engineered specifically for carrier-grade short-haul E1/T1/J1 infrastructure requiring protocol agility, diagnostic capability, and field-upgradable redundancy.
FAQ
What line protocols does the DS26303L-120+ support?
The DS26303L-120+ supports E1 (2.048MHz), T1 (1.544MHz), and J1 line rates across all eight channels. Each channel can be independently configured for E1, T1, or J1 operation via register settings. Line encoding is selectable per channel as AMI, HDB3 (for E1), or B8ZS (for T1/J1), and compliance is verified per ANSI T1.102, ITU-T G.703, and ETS 300 233 standards. The DS26303L-120+ uses an on-chip synthesizer to derive required clocks from a single master clock input.
Does the DS26303L-120+ require an external crystal?
No, the DS26303L-120+ includes a crystal-less jitter attenuator that meets ITU-T G.823 requirements without external oscillators. It accepts a single master clock input-multiple of 2.048MHz for E1 or 1.544MHz for T1/J1-and internally adapts it for precise line-rate generation and jitter cleanup. This eliminates BOM cost and layout complexity associated with external VCXOs or TCXOs, and the DS26303L-120+ maintains full specification compliance under this architecture.
What is the default impedance setting for DS26303L-120+?
The DS26303L-120+ defaults to 120Ω line impedance for E1 mode, as indicated by the "-120" suffix in the part number. This applies to internal termination configuration; external 75Ω termination remains supported via external components. The device allows software-selectable transmit and receive-side termination per channel, enabling flexible deployment across regional line standards without hardware changes. All DS26303L-120+ units maintain this 120Ω E1 default regardless of temperature grade or packaging variant.
How does the DS26303L-120+ support redundancy and failover?
The DS26303L-120+ implements hitless-protection switching (HPS) with configurable 1:1 or 1+1 backup architectures. It supports nonintrusive monitoring per G.772, optimal high-impedance standby states, and automatic switchover upon LOS, AIS, or BPV detection-all without service interruption. Redundancy is managed entirely within the DS26303L-120+ via dedicated control registers and hardware signaling, eliminating need for external FPGA or microcontroller coordination during failover events.
What host interface options does the DS26303L-120+ provide?
The DS26303L-120+ supports three host interface modes: 8-bit parallel (Intel or Motorola timing), 4-wire serial, and JTAG boundary scan. Parallel mode uses MODESEL pin to select bus protocol and timing; serial mode uses CLK, DATA, CS, and STB signals. All interfaces allow full register access, BERT control, and interrupt handling. JTAG enables IEEE 1149.1-compliant testing and debug without host processor involvement. The DS26303L-120+ requires no external glue logic for any interface mode.
DS26303L-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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LQFP-EP (20x20)
DS26303L-120+ FAQ
1.How can I place an order for DS26303L-120+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26303L-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 DS26303L-120+ reliable?
The price and inventory of DS26303L-120+ 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+ is usually 5 days.
3.What payment methods are accepted for DS26303L-120+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26303L-120+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26303L-120+?
DS26303L-120+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26303L-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 DS26303L-120+?
For technical support, including DS26303L-120+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26303L-120+ requirements.
6.How does Aetrix verify that DS26303L-120+ is sourced from the original manufacturer or authorized distributors?
All DS26303L-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 DS26303L-120+ meets industry standards.
7.What is the process for return or replacement of DS26303L-120+?
All DS26303L-120+ units undergo pre-shipment inspection (PSI). If there is an issue with DS26303L-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 DS26303L-120+ part is unused and in its original packaging.
Return procedure for DS26303L-120+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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