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Analog Devices Inc./Maxim Integrated DS21Q50LN+
- Part No.:
- DS21Q50LN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21Q50LN+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
The DS21Q50LN+ from Maxim Integrated is a quad E1 transceiver IC designed for high-density E1 line termination in telecom infrastructure. It integrates four independent E1 framer/transceiver channels, on-chip clock/data recovery for AMI/HDB3 waveforms, selectable 32-bit or 128-bit jitter attenuation, and full G.703/G.704/G.823 compliance. It supports 75Ω coax and 120Ω twisted-pair interfaces up to 2km and operates across –40°C to +85°C.
For engineers reviewing the DS21Q50LN+ datasheet, DS21Q50LN+ pinout, DS21Q50LN+ application, or DS21Q50LN+ equivalent, this device serves as a complete E1 interface solution with integrated elastic store slip buffering, PRBS generation/detection, and interleaved PCM bus operation up to 16.384MHz - critical for DSLAMs, IMA equipment, and carrier-grade routers.
Technical Context
The DS21Q50LN+ implements four fully independent E1 transceivers, each with dedicated receive clock/data recovery (RRING/RTIP), transmit waveshaping (TRING/TTIP), and framer logic supporting FAS, CAS, CCS, and CRC4 formats. Its dual-path jitter attenuators (32/128-bit) are configurable per channel into either transmit or receive data paths.
It features a 4/8/16MHz clock synthesizer locked to any E1 line, automatic system clock source switching on loss-of-clock, and two-frame elastic-store buffers on the receive side to manage phase/frequency misalignment between asynchronous E1 streams and backplane clocks (2.048–16.384MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| E1 Channels | Four independent, fully functional E1 transceivers with separate framing, alarm monitoring, and loopback control. |
| Interface Compliance | Fully meets ITU-T G.703 (75Ω/120Ω), G.704, G.706, G.823, G.732, I.431, ETS 300 011/233/166, CTR12, and CTR4. |
| Jitter Attenuation | Selectably 32-bit or 128-bit crystal-less jitter attenuator per channel, assignable to transmit or receive path. |
| Receive Sensitivity | 0dB to –43dBm input range enables reliable operation over 2km of 22AWG twisted-pair cable. |
| PCM Bus Speed | Supports interleaved PCM bus operation up to 16.384MHz, enabling eight E1 streams on one high-speed bus. |
| Operating Temperature | –40°C to +85°C industrial grade, validated for carrier-class telecom equipment deployment. |
| Supply Voltage | 3.3V low-power CMOS design with separate analog/digital supply domains (DVDD/RVDD/TVDD). |
Pinout & Package
DS21Q50LN+ is housed in a 100-pin LQFP package (14mm × 14mm) with exposed thermal pad. Pin functions are partitioned into four E1 analog I/O sets (RRING/RTIP/TRING/TTIP), digital system interface (SYSCLK, TSER/RSER, TSYNC/RSYNC), parallel/serial control port (D0–D7, A0–A4, CS, RD, WR), and user-configurable outputs (OUTA1–4, OUTB1–4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RRING1–RRING4 | Receive analog ring input | Differential analog input for AMI/HDB3 waveform recovery; supports transformer-coupled 75Ω/120Ω lines. |
| RTIP1–RTIP4 | Receive analog tip input | Complementary differential analog input paired with RRING; referenced to RVSS analog ground. |
| TRING1–TRING4 | Transmit analog ring output | Active transmit waveshaper output meeting G.703 templates for coax/twisted-pair; driven by internal line driver. |
| TTIP1–TTIP4 | Transmit analog tip output | Differential complement to TRING; requires external transformer coupling for impedance matching. |
| TSER1–TSER4 / RSER1–RSER4 | Transmit/receive serial data | NRZ serial PCM data at 2.048Mbps per channel; supports time-slot assignment and interleaving. |
| SYSCLK1–SYSCLK4 | System clock input | Accepts 2.048/4.096/8.192/16.384MHz clock for timing transmit/receive logic and elastic store synchronization. |
| OUTA1–OUTA4 / OUTB1–OUTB4 | User-configurable output | Eight programmable GPIOs usable for status signaling, alarm indication, or control handshaking. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved PCM Bus (IBO) | Enables multiplexing of up to eight E1 streams onto a single 16.384MHz PCM bus without external logic. |
| Two-Frame Elastic Store | Manages asynchronous slip conditions between recovered E1 data and backplane clock, preventing data loss. |
| PRBS Generation/Detection | On-chip pseudo-random bit sequence generator and detector with error counting per channel. |
| Automatic Alarm Handling | Detects and generates AIS, remote alarm, loss-of-signal, and loss-of-synchronization per E1 link. |
| Flexible Clock Synthesis | Derives 4/8/16MHz system clock from any selected E1 line; includes backup clock MUX and loss-of-clock switching. |
Applications
| DSLAM Line Cards | Routers with E1 WAN Interfaces |
|---|---|
|
Use Scenario: Aggregating multiple E1 subscriber lines in digital subscriber line access multiplexers. IC Role / Device Role / Timing Role: Quad E1 transceiver providing physical layer termination, clock recovery, and frame alignment for all four E1 ports. Use Value: Enables high-density line card designs with integrated jitter attenuation and elastic store, eliminating need for discrete clock cleaners or framers. |
Use Scenario: Adding carrier-grade E1 connectivity to enterprise or service provider edge routers. IC Role / Device Role / Timing Role: Full E1 interface IC handling AMI/HDB3 decoding, CAS/CCS signaling, and alarm reporting over 75Ω/120Ω media. Use Value: Reduces BOM count by integrating framer, jitter attenuator, and line driver - simplifying PCB layout and qualification. |
| IMA Equipment | WAN Optimization Appliances |
|
Use Scenario: Inverse multiplexing across multiple E1 links for bandwidth aggregation in legacy TDM networks. IC Role / Device Role / Timing Role: Synchronizes and aligns four E1 streams using elastic store and interleave bus, feeding unified PCM data to IMA controller. Use Value: Provides deterministic latency and precise frame boundary alignment required for IMA packetization and reassembly. |
Use Scenario: Deploying WAN optimization gateways in telco central offices with native E1 uplinks. IC Role / Device Role / Timing Role: Physical layer interface converting E1 signals to NRZ serial data for protocol processing and compression engines. Use Value: Delivers robust signal integrity over long copper runs and supports real-time alarm monitoring for SLA enforcement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q55LN+ | Pin-compatible upgrade with extended jitter tolerance (±1000ppm vs. ±500ppm), enhanced PRBS diagnostics, and improved ESD rating (±8kV HBM). | Targets next-gen DSLAMs requiring higher resilience to network jitter and stricter ESD compliance in field-deployed units. | Preferred when upgrading legacy DS21Q50LN+ designs for improved robustness without layout change. |
| SI5338A-B-GM | Programmable clock generator (not transceiver); lacks E1 framer, line interface, or alarm logic - only provides jitter-cleaned clock synthesis. | Used as companion clock source for systems where E1 transceivers are discrete, not as direct functional replacement. | Only suitable as auxiliary clock source - cannot replace DS21Q50LN+ in E1 line termination role. |
Compared with DS21Q50LN+, DS21Q55LN+ offers drop-in reliability upgrades while SI5338A-B-GM serves only clock conditioning - neither eliminates the need for a dedicated E1 transceiver in line-card designs requiring full G.703/G.704 compliance.
Availability
DS21Q50LN+ is available at Aetrix Electronics and suitable for DSLAMs, carrier-grade routers, IMA equipment, and WAN optimization appliances requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for DS21Q50LN+ 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 precision analog, mixed-signal, and power management ICs for communications, industrial, and computing markets.
The DS21Q50LN+ belongs to Maxim's telecom line interface portfolio, engineered specifically for high-reliability E1/E2 physical layer termination in carrier infrastructure equipment.
FAQ
What is the operating temperature range of the DS21Q50LN+?
The DS21Q50LN+ is rated for industrial operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table and validated across all electrical parameters in the datasheet's Operating Parameters section. The 'LN' suffix explicitly denotes this extended temperature grade, distinguishing it from the commercial-grade DS21Q50L (0°C to +70°C). DS21Q50LN+ maintains full G.703/G.704 compliance and jitter performance across this full range.
Does the DS21Q50LN+ support both 75Ω coaxial and 120Ω twisted-pair E1 interfaces?
Yes, the DS21Q50LN+ supports both 75Ω coaxial and 120Ω twisted-pair E1 interfaces. Its transmit line drivers meet G.703 waveshape requirements for both media types, and its receive sensitivity (0dB to –43dBm) accommodates signal degradation over up to 2km of 22AWG twisted pair. Transformer coupling is required for impedance matching, and the datasheet provides recommended external transformer specifications in Table 16-4.
How many independent E1 transceivers does the DS21Q50LN+ integrate?
The DS21Q50LN+ integrates four fully independent E1 transceivers. Each channel has dedicated analog I/O pins (RRING/RTIP/TRING/TTIP), serial data paths (TSER/RSER), sync signals (TSYNC/RSYNC), and system clocks (SYSCLK). The block diagram (Figure 1-1) and Pin Assignment Tables (Tables 2-1 and 2-2) confirm discrete signal routing per channel, enabling simultaneous operation without resource contention.
What clock frequencies does the DS21Q50LN+ clock synthesizer generate?
The DS21Q50LN+ clock synthesizer generates 4MHz, 8MHz, and 16.384MHz output frequencies. These are derived from and phase-locked to any selected E1 line (2.048MHz), as specified in Table 9-2 (Synthesizer Output Select) and Section 9 (System Clock Interface). The 16.384MHz output directly supports interleaved PCM bus operation across eight E1 streams.
Can the DS21Q50LN+ perform PRBS testing on individual E1 channels?
Yes, the DS21Q50LN+ supports per-channel PRBS generation and detection with dedicated error counters. Section 8 (PRBS Generation and Detection) and Tables 8-1/8-2 detail mode-select configurations for each transceiver. The device counts bit errors, detects pattern mismatches, and reports results via status registers - enabling in-system validation of E1 link integrity without external test equipment.
DS21Q50LN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Transceiver
- Interface:
- E1
- Number of Circuits:
- 4
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 230mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21Q50LN+ FAQ
1.How can I place an order for DS21Q50LN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21Q50LN+ 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 DS21Q50LN+ reliable?
The price and inventory of DS21Q50LN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21Q50LN+ is usually 5 days.
3.What payment methods are accepted for DS21Q50LN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21Q50LN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21Q50LN+?
DS21Q50LN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21Q50LN+ 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 DS21Q50LN+?
For technical support, including DS21Q50LN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21Q50LN+ requirements.
6.How does Aetrix verify that DS21Q50LN+ is sourced from the original manufacturer or authorized distributors?
All DS21Q50LN+ 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 DS21Q50LN+ meets industry standards.
7.What is the process for return or replacement of DS21Q50LN+?
All DS21Q50LN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21Q50LN+, 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 DS21Q50LN+ part is unused and in its original packaging.
Return procedure for DS21Q50LN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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