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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:2,360
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Product details
Overview
DS21Q50LN from Maxim Integrated is a quad E1 transceiver IC designed for high-density line interface termination in telecom infrastructure. It integrates four independent E1 (CEPT) PCM-30/ISDN-PRI transceivers, supports AMI/HDB3 waveform recovery over 0–2km twisted-pair, provides selectable 32-bit or 128-bit jitter attenuation, and operates across –40°C to +85°C. It is deployed in DSLAMs and IMA/WAN equipment for synchronous TDM backplane interfacing.
For engineers reviewing the DS21Q50LN datasheet, DS21Q50LN pinout, DS21Q50LN application, or DS21Q50LN equivalent, this page delivers verified technical context, package mapping, real-world use-value per application, and validated alternative options - all grounded in Maxim's official DS21Q50 documentation and LQFP-100 pin assignment tables.
Technical Context
The DS21Q50LN implements four fully independent E1 framer/line interface units, each with dedicated clock/data recovery, framing (FAS/CAS/CCS/CRC4), and elastic-store slip buffering on receive. Its interleave bus option (IBO) multiplexes up to eight E1 streams onto a single 16.384MHz PCM bus without external logic.
It features a 4/8/16MHz system clock synthesizer locked to any selected E1 line, dual-path jitter attenuators (configurable per transceiver to TX or RX path), and PRBS generation/detection with error counting for BPV, CRC4, FAS, and E-bit violations - all operating at 3.3V CMOS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| E1 Channels | Four independent E1 transceivers supporting PCM-30 and ISDN-PRI framing |
| Operating Temp | –40°C to +85°C - qualified for industrial and outdoor telecom cabinet deployment |
| Jitter Attenuation | Selectable 32-bit or 128-bit crystal-less attenuation, assignable per channel to TX or RX path |
| Line Interface | AMI/HDB3 recovery with 0dB to –43dB receive sensitivity; supports 75Ω coax and 120Ω twisted-pair |
| System Clock | Integrated 4/8/16MHz synthesizer phase-locked to any E1 line - eliminates external clock generator |
| PCM Bus Speed | Interleaved operation up to 16.384MHz - enables eight-E1 aggregation on single backplane bus |
| Power Supply | 3.3V low-power CMOS - reduces thermal load in high-port-density line cards |
Pinout & Package
DS21Q50LN is housed in a 100-pin LQFP package (14mm × 14mm), with dedicated analog/digital supply and ground domains, four independent E1 analog I/O pairs (RTIP/RRING, TTIP/TRING), and multiplexed parallel/serial control interfaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RTIP1–RTIP4, RRING1–RRING4 | Receive Analog Inputs | Differential analog inputs for AMI/HDB3 waveform recovery from four E1 lines |
| TTIP1–TTIP4, TRING1–TRING4 | Transmit Analog Outputs | Differential analog outputs with G.703-compliant waveshaping for 75Ω/120Ω line driving |
| RSER1–RSER4, TSER1–TSER4 | Digital Data I/O | NRZ serial data paths (receive/transmit) aligned to E1 frame timing |
| SYSCLK1–SYSCLK4 | System Clock Input | Accepts 2.048/4.096/8.192/16.384MHz clocks for backplane synchronization |
| D0/AD0–D7/AD7, A0–A4, CS, WR, RD | Parallel Control Port | 8-bit multiplexed address/data bus with standard Intel/Motorola timing for register access |
| OUTA1–OUTA4, OUTB1–OUTB4 | User-Configurable Outputs | Eight programmable digital outputs for status signaling, alarm indication, or custom control |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved PCM Bus (IBO) | Enables eight-E1 data aggregation onto one 16.384MHz backplane bus - cuts interconnect count by 50% |
| Two-Frame Elastic Store | Manages asynchronous slip between recovered E1 clocks and backplane SYSCLK - prevents data loss during frequency drift |
| Per-Channel Loopback Modes | Four independent loopback types (local, remote, framer, PRBS) per transceiver - accelerates field diagnostics |
| Comprehensive Alarm Handling | Detects/generates AIS, remote alarm, loss-of-signal, and loss-of-sync - meets ITU-T G.732 and ETS 300 011 requirements |
| PRBS Generator/Detector | On-chip pattern generation and error counting for BPV, CRC4, FAS, and E-bit - eliminates need for external test gear |
Applications
| DSLAM Line Card | WAN Router E1 Module |
|---|---|
|
Use Scenario: High-port-density DSLAM line cards aggregating 16+ E1 lines into ATM or IP backplanes. IC Role / Device Role / Timing Role: Quad E1 transceiver providing clock recovery, framing, jitter attenuation, and IBO-based PCM bus consolidation. Use Value: Reduces FPGA resource usage and PCB layer count by offloading E1 framing and interleaving functions - improves time-to-market for carrier-grade DSLAMs. |
Use Scenario: Modular WAN routers requiring hot-swappable E1 interface modules with full alarm monitoring. IC Role / Device Role / Timing Role: E1 line interface IC handling AMI/HDB3 recovery, CAS/CCS signaling, and remote alarm generation per ITU-T G.704/G.706. Use Value: Enables single-chip support for all E1 physical and logical layer functions - simplifies compliance testing against ETSI ETS 300 233. |
| IMA Backhaul Unit | Cellular Base Station Abis Link |
|
Use Scenario: IMA (Inverse Multiplexing over ATM) equipment bonding multiple E1 links for broadband backhaul. IC Role / Device Role / Timing Role: Synchronizes four E1 streams to a common 16.384MHz system clock and performs elastic store alignment before IMA segmentation. Use Value: Maintains sub-125µs inter-stream skew across bonded E1s - ensures compliant IMA cell reassembly at the far end. |
Use Scenario: GSM base station controllers connecting to remote BTS via Abis interface over E1 leased lines. IC Role / Device Role / Timing Role: E1 transceiver managing FAS/CRC4 framing, Sa/Si bit handling, and AIS propagation per ETS 300 166. Use Value: Provides deterministic 125µs frame alignment and real-time alarm reporting - critical for BTS synchronization and O&M continuity. |
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 | Same pinout and feature set; adds integrated transformer driver support for direct 75Ω coax drive | Better suited for coax-dominant deployments where external line transformers are omitted | Choose DS21Q55LN when eliminating discrete transformer components is a priority |
| MC21Q50L | Functionally identical but rated only for 0°C to +70°C; shares same LQFP-100 footprint | Limited to commercial-temperature indoor equipment like enterprise routers | Choose MC21Q50L only if ambient temperature stays within 0–70°C and cost is primary constraint |
Compared with DS21Q50LN, DS21Q55LN extends analog drive capability for coax while retaining full compatibility, whereas MC21Q50L sacrifices industrial temperature range for lower unit cost - making DS21Q50LN the sole choice for outdoor or thermally variable telecom environments.
Availability
DS21Q50LN is available at Aetrix Electronics and suitable for DSLAMs, WAN routers, and IMA backhaul equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for carrier-grade production.
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 product line, engineered specifically for high-reliability E1/E2 infrastructure - emphasizing jitter resilience, multi-channel integration, and standards compliance (ITU-T G.703/G.704/ETS 300 011).
FAQ
What is the operating temperature range of the DS21Q50LN?
The DS21Q50LN is rated for industrial operation from –40°C to +85°C. This extended range enables deployment in uncontrolled environments such as roadside cabinets, cellular base station shelters, and outdoor DSLAM enclosures where ambient temperatures exceed commercial limits. The DS21Q50LN maintains full electrical performance across this range per Maxim's characterization data.
Does the DS21Q50LN support both 75Ω coax and 120Ω twisted-pair E1 interfaces?
Yes, the DS21Q50LN supports both 75Ω coaxial and 120Ω balanced twisted-pair E1 line interfaces. Its transmit waveshaping circuitry complies with ITU-T G.703 templates for both media types, and its receive sensitivity (0dB to –43dB) accommodates signal degradation over 2km of 22AWG twisted-pair. The DS21Q50LN requires external line transformers configured per medium - no internal switching between impedance types.
How does the interleave bus option (IBO) function in the DS21Q50LN?
The DS21Q50LN's interleave bus option (IBO) allows two DS21Q50LN devices to multiplex eight E1 data streams onto a single 16.384MHz PCM bus. Each device contributes four time-division-multiplexed channels, synchronized to a shared system clock derived from one E1 line. This eliminates external glue logic and reduces backplane routing complexity - a key advantage in high-density line cards where the DS21Q50LN is used.
Can the DS21Q50LN perform PRBS testing on individual E1 channels?
Yes, the DS21Q50LN includes per-channel PRBS generation and detection with dedicated error counters for BPV, CRC4, FAS, and E-bit violations. Each of the four transceivers can independently run PRBS-20 patterns in transmit mode while monitoring incoming data in receive mode - enabling isolation of link-level faults without external test equipment. This capability is fully accessible via the DS21Q50LN's parallel or serial control port.
What clock sources does the DS21Q50LN support for system synchronization?
The DS21Q50LN supports multiple clock sources: recovered E1 line clocks (RCLK), external 2.048/4.096/8.192/16.384MHz SYSCLK inputs, or internally synthesized clocks from its 4/8/16MHz synthesizer locked to any selected E1 line. The device automatically switches between primary and backup clock sources on loss-of-clock events - ensuring continuous timing integrity for the DS21Q50LN's framers and jitter attenuators.
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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