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Analog Devices Inc./Maxim Integrated DS21Q59LN+
- Part No.:
- DS21Q59LN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21Q59LN+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
DS21Q59LN+ from Maxim Integrated (now Analog Devices) is a quad E1 transceiver IC for telecom line interface applications, integrating four complete E1 (CEPT) PCM-30/ISDN-PRI transceivers with line interface unit (LIU), framer, and TDM backplane interface. It operates across –40°C to +85°C, supports 3.3V supply, and delivers CAS/CCS signaling, FAS/CRC4 framing, and 16.384MHz interleaved PCM bus operation - deployed in DSLAMs and IMA equipment.
For engineers reviewing the DS21Q59LN+ datasheet, DS21Q59LN+ pinout, DS21Q59LN+ application, or DS21Q59LN+ equivalent, key selection considerations include its crystal-less jitter attenuator (32-/128-bit), flexible Intel/Motorola/serial host interface, per-channel loopback, PRBS generation/detection, and support for long-haul/short-haul G.703 line interfaces without external logic.
Technical Context
The DS21Q59LN+ implements four independent E1 transceivers, each with dedicated LIU (G.703-compliant transmit waveshaping and receive clock/data recovery), framer (HDB3/AMI coding, CRC4 insertion/checking, FAS alignment), and elastic-store slip buffer on receive. Its architecture enables asynchronous backplane interfacing via dual-frame elastic store and interleave bus option (IBO).
It integrates a 4/8/16MHz clock synthesizer with automatic source switching on loss-of-clock, two configurable user output pins per channel (OUTA/OUTB), and hardware-selectable alternate jitter attenuator (AJACKI/AJACKO). All four transceivers support independent transmit/receive functionality, remote/local/framer loopbacks, and comprehensive error monitoring (BPV, CRC4, FAS, E-bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| E1 Channels | Four fully independent E1 transceivers supporting PCM-30 and ISDN-PRI framing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and telecom infrastructure environments. |
| Supply Voltage | 3.3V ±5% - low-power CMOS design enabling thermal-efficient high-density line cards. |
| Jitter Attenuation | Crystal-less 32-bit or 128-bit jitter attenuator per channel - eliminates need for external crystal oscillators. |
| System Clock Synthesis | 4MHz/8MHz/16MHz synthesizer with automatic failover - allows any E1 line to serve as master clock source. |
| Backplane Interface | Interleaved PCM bus up to 16.384MHz - enables eight E1 streams on single high-speed bus without external logic. |
| Signaling Support | CAS and CCS signaling with dedicated registers - enables full telephony channel-associated control in DSLAMs. |
Pinout & Package
DS21Q59LN+ is housed in a 100-pin LQFP package (14mm × 14mm, 0.5mm pitch), with separate analog/digital power and ground domains per transceiver quadrant, plus dedicated system clock, serial/parallel control, and E1 tip/ring I/O terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TTIP1–TTIP4, TRING1–TRING4 | Transmit analog outputs | Differential E1 line drivers compliant with G.703 75Ω coax or 120Ω twisted-pair waveshapes. |
| RTIP1–RTIP4, RRING1–RRING4 | Receive analog inputs | High-sensitivity receivers with automatic gain adjustment for variable line signal levels. |
| D0–D7/AD0–AD7, A0–A4, ALE/AS, CS, RD/DS, WR/RW | Parallel host interface | 8-bit multiplexed/nonmultiplexed bus supporting Intel/Motorola timing modes for register access and configuration. |
| TSER1–TSER4, RSER1–RSER4, TSYNC1–TSYNC4, RSYNC1–RSYNC4 | TDM backplane data/sync | Time-division multiplexed serial interface for PCM data transfer at 2.048Mbps per E1 channel. |
| OUTA1–OUTA4, OUTB1–OUTB4 | User-configurable outputs | Eight general-purpose outputs programmable for alarm flags, status indicators, or control signals. |
Key Features
| Feature | Design Value |
|---|---|
| Pin compatibility with DS21Q50 | Direct drop-in replacement for legacy designs - no PCB redesign required. |
| Two-frame elastic-store buffer | Enables robust synchronization with asynchronous host systems and handles slip conditions transparently. |
| Per-channel PRBS generation/detection | On-chip pattern testing per E1 link - eliminates need for external test equipment during production and field diagnostics. |
| Integrated 4/8/16MHz clock synthesizer | Derives system clock from any E1 line - removes external PLLs and simplifies clock tree design. |
| Comprehensive error monitoring | Independent 16-bit counters for BPV, CRC4, FAS, and E-bit errors per channel - enables real-time line health assessment. |
Applications
| DSLAM Line Card | Routers with E1 WAN Interfaces |
|---|---|
Use Scenario: High-density E1 termination in carrier-class DSL access multiplexers handling hundreds of subscriber lines. IC Role / Device Role / Timing Role: Quad E1 transceiver providing physical layer interface, framing, CAS signaling, and jitter attenuation for upstream aggregation. Use Value: Enables 4× E1 line density per IC with integrated clock synthesis and elastic store - reduces component count and board space by >30% vs. discrete solutions. |
Use Scenario: Enterprise or service-provider edge routers requiring multiple E1 WAN ports for leased-line connectivity. IC Role / Device Role / Timing Role: Physical-layer E1 interface IC managing HDB3 decoding, FAS alignment, and alarm reporting for packet-to-TDM bridging. Use Value: Supports both long-haul and short-haul G.703 links with auto-adjusting receive sensitivity - eliminates manual line build-out configuration. |
| IMA Equipment | WAN Aggregation Platforms |
Use Scenario: Inverse multiplexing over ATM (IMA) systems bundling multiple E1 lines into a single logical high-bandwidth pipe. IC Role / Device Role / Timing Role: Synchronized E1 transceiver with IBO-enabled 16.384MHz interleaved bus - feeds aggregated PCM data to ATM segmentation engine. Use Value: IBO allows eight E1 streams (four DS21Q59LN+ devices) to share one backplane bus - cuts interconnect complexity and routing layers. |
Use Scenario: Central office WAN concentrators aggregating E1 traffic from remote sites into SONET/SDH or IP backbone. IC Role / Device Role / Timing Role: E1 line interface with CRC4 validation, AIS/remote alarm detection, and PRBS diagnostics - ensures transport integrity before aggregation. Use Value: Real-time BPV and CRC4 error counters per channel feed OAM&P systems - enables proactive line maintenance and SLA compliance reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q50N+ | Lacks signaling access, improved interrupt handling, and 32-/128-bit jitter attenuator; identical pinout and core E1 functionality. | No CAS/CCS support; limited diagnostic capability; not suitable for new deployments requiring enhanced signaling or jitter performance. | Select DS21Q59LN+ when signaling access, jitter attenuation, or modern interrupt architecture is required - DS21Q50N+ only for legacy DS21Q50 drop-in replacements. |
| MAX3005E/D | Single-channel E1 transceiver; requires four units for quad function; lacks integrated clock synthesizer and IBO capability. | Higher BOM cost and board area; no native interleaved bus; clock management requires external PLLs. | Choose DS21Q59LN+ for integrated quad-channel operation and system-level features - MAX3005E/D only where single-channel modularity or specific qualification requirements apply. |
Compared with DS21Q50N+, DS21Q59LN+ adds signaling access and jitter attenuation without layout changes; versus MAX3005E/D, it delivers 75% lower component count and eliminates external clock synthesis - making it optimal for space-constrained, high-reliability telecom line cards.
Availability
DS21Q59LN+ is available at Aetrix Electronics and suitable for DSLAMs, IMA equipment, and WAN routers requiring stable component supply, extended temperature operation, and long-term lifecycle support in telecom infrastructure.
Supply support for DS21Q59LN+ 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 (acquired by Analog Devices in 2021) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The DS21Q59LN+ belongs to Maxim's telecom line interface product line, designed specifically for high-density E1 termination in carrier-grade access and aggregation equipment with minimal external components.
FAQ
What is the operating temperature range of the DS21Q59LN+?
The DS21Q59LN+ is rated for industrial operation from –40°C to +85°C, validated per its datasheet specifications and qualified for deployment in outdoor DSLAM cabinets and central office environments where ambient temperatures fluctuate widely. This range exceeds the commercial-grade DS21Q59L variant and ensures reliability in uncontrolled telecom infrastructure settings. The DS21Q59LN+ maintains full E1 functionality, including jitter attenuation and CAS signaling, across this entire range.
Does the DS21Q59LN+ support both parallel and serial host interfaces?
Yes, the DS21Q59LN+ supports configurable parallel port operation (Intel or Motorola bus timing) and serial port operation (four modes selectable via BTS0/BTS1), all accessible through the same pin set. Configuration is controlled by PBTS, BTS0, and BTS1 pins, allowing dynamic selection without hardware modification. This flexibility enables seamless integration into legacy parallel-controlled systems or newer serial-based microcontroller platforms - a key feature distinguishing the DS21Q59LN+ from earlier variants like the DS21Q50.
How does the crystal-less jitter attenuator in the DS21Q59LN+ function?
The DS21Q59LN+ incorporates a crystal-less jitter attenuator configurable as either 32-bit or 128-bit, requiring only a 2.048MHz MCLK input to suppress phase jitter in either transmit or receive paths. It uses internal VCO/PLL circuitry to clean recovered or generated clocks without external crystals or VCXOs. Each of the four transceivers has its own dedicated attenuator, and an additional undedicated unit (AJACKI/AJACKO) can be hardware-routed - a capability confirmed in the DS21Q59LN+ datasheet block diagram and pin description tables.
Is the DS21Q59LN+ pin-compatible with the DS21Q50?
Yes, the DS21Q59LN+ is explicitly documented as pin-compatible with the DS21Q50 and functions as a direct replacement. Pin assignments, power domains, analog I/O locations, and host interface signals match identically - enabling drop-in upgrades in existing designs. However, the DS21Q59LN+ adds new functionality (signaling access, enhanced interrupts, jitter attenuator) accessible via newly defined register bits, not new pins. This compatibility is stated in the "Features" section and verified in Tables 4-A and 4-B of the official datasheet.
What standards does the DS21Q59LN+ comply with?
The DS21Q59LN+ complies with ITU-T G.703 (physical layer), G.704 (framing structure), G.706 (error detection), G.823 (jitter), G.732 (test procedures), and I.431 (ISDN PRI), as well as ETSI standards ETS 300 011, ETS 300 233, and ETS 300 166. It also meets CTR12 and CTR4 regulatory requirements. These certifications are explicitly listed in the "Detailed Description" section and confirmed in the device's qualification documentation - ensuring interoperability in global telecom networks.
DS21Q59LN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Transceiver
- Interface:
- E1
- Number of Circuits:
- 4
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 230mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21Q59LN+ FAQ
1.How can I place an order for DS21Q59LN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21Q59LN+ 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 DS21Q59LN+ reliable?
The price and inventory of DS21Q59LN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21Q59LN+ is usually 5 days.
3.What payment methods are accepted for DS21Q59LN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21Q59LN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21Q59LN+?
DS21Q59LN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21Q59LN+ 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 DS21Q59LN+?
For technical support, including DS21Q59LN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21Q59LN+ requirements.
6.How does Aetrix verify that DS21Q59LN+ is sourced from the original manufacturer or authorized distributors?
All DS21Q59LN+ 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 DS21Q59LN+ meets industry standards.
7.What is the process for return or replacement of DS21Q59LN+?
All DS21Q59LN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21Q59LN+, 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 DS21Q59LN+ part is unused and in its original packaging.
Return procedure for DS21Q59LN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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