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Analog Devices Inc./Maxim Integrated DS21Q352B+
- Part No.:
- DS21Q352B+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 256-BGA
- Datasheet:
-
DS21Q352B+.pdf
- Description:
- IC TELECOM INTERFACE 256BGA
- Quantity:
- Payment:
- Shipping:
Inventory:307
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Product details
Overview
DS21Q352B+ from Maxim Integrated (formerly Dallas Semiconductor) is a quad-channel T1 transceiver Multi-Chip Module (MCM) operating at 3.3V supply, integrating four independent DS21352 die. It delivers full T1 line interface (short/long haul), framing, elastic store, per-DS0 signaling control, and HDLC support per channel, targeting telecom access multiplexers and TDM backplane interfaces.
For engineers reviewing the DS21Q352B+ datasheet, DS21Q352B+ pinout, DS21Q352B+ application, or DS21Q352B+ equivalent, this page provides verified technical context, confirmed pin functions, real-world T1 system integration details, and validated alternative options for T1 transceiver consolidation in carrier-grade edge equipment.
Technical Context
The DS21Q352B+ implements four fully independent T1 transceiver subsystems (SCT1–SCT4), each comprising a line interface unit (LIU), framer with alarm detection/generation, elastic store, and hardware-based signaling engine. Each channel supports both short-haul (100Ω) and long-haul (75Ω) T1 line termination with integrated analog tip/ring I/O.
It features IEEE 1149.1 JTAG boundary scan, 8.192MHz backplane concatenation capability across all four channels, and pin compatibility with DS21Q354 (E1), DS21Q552 (5V T1), and DS21Q554 (5V E1). Power domains are segregated per channel: DVDD/DVSS (digital core), RVDD/RVSS (receive analog), TVDD/TVSS (transmit analog).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quad T1 transceiver MCM - four independent DS21352 instances in single package |
| Supply Voltage | 3.3V ±0.3V digital core; separate 3.3V analog supplies for receive/transmit sections |
| Data Rate | 1.544 Mbps per T1 channel; supports full T1 framing (D4/SF, ESF), B8ZS, and AMI line coding |
| Interface | Parallel 8-bit host bus (A0–A7/ALE, D0–D7/AD0–AD7) with Intel/Motorola bus type select (BTS) |
| Package | 256-ball MCM BGA, 27mm × 27mm, 1.27mm pitch - mechanical footprint matches DS21Q354/DS21Q552/DS21Q554 |
| JTAG Support | IEEE 1149.1 compliant boundary scan with dedicated JTCLK, JTDI, JTMS, JTRST*, and per-SCT JTDO outputs |
| Channel Concatenation | All four T1 streams can be combined into a single 8.192MHz backplane data stream via carry chain (CI/CO signals) |
Pinout & Package
256-ball MCM BGA package (27mm × 27mm, 1.27mm pitch); ball grid layout defined in Figure 2 of preliminary datasheet. Power and ground balls are distributed across all four quadrants to support per-channel analog/digital domain isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RCLK1–RCLK4 | Receive clock output (framer) | Provides 1.544MHz recovered receive clock per channel; used for synchronous host interface timing |
| TCLK1–TCLK4 | Transmit clock input | Accepts 1.544MHz transmit reference clock per channel; drives LIU and framer timing |
| RTIP1–RTIP4 / RRING1–RRING4 | Analog receive inputs | Differential analog inputs for T1 line termination; support both 100Ω short-haul and 75Ω long-haul configurations |
| TTIP1–TTIP4 / TRING1–TRING4 | Analog transmit outputs | Differential analog outputs driving T1 line; include on-chip line drivers with programmable gain and impedance matching |
| CS1*–CS4* | Chip select (active low) | Independent chip selects enable individual SCT access without address decoding overhead |
| CI1–CI4 / CO1–CO4 | Carry chain I/O | Enable 4-channel concatenation into 8.192MHz backplane stream; CI feeds CO of adjacent SCT |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent T1 transceivers | Eliminates four discrete DS21352 ICs and associated layout complexity; reduces PCB area by >60% vs. discrete solution |
| Per-channel analog I/O + digital framer | Each SCT integrates full T1 line interface (LIU), framer, elastic store, and HDLC controller - no external components required per channel |
| Pin-compatible T1/E1 family | Same 256-ball footprint supports DS21Q352 (3.3V T1), DS21Q354 (3.3V E1), DS21Q552 (5V T1), DS21Q554 (5V E1) - simplifies platform reuse |
| JTAG boundary scan | Enables production test and debug of all four SCTs through single IEEE 1149.1 chain; JTDO outputs per SCT allow hierarchical fault isolation |
| 8.192MHz backplane concatenation | Hardware carry chain (CI/CO) merges four 1.544Mbps T1 streams into one high-speed parallel bus - enables compact TDM switch fabric implementation |
Applications
| Access Multiplexer | TDM Backplane Interface |
|---|---|
Use Scenario: Aggregating 96 DS0 channels from multiple T1 lines into a single OC-3/STM-1 upstream link in DSLAM or MSAN platforms. IC Role / Device Role / Timing Role: DS21Q352B+ serves as the front-end T1 line interface and framing engine, providing clock recovery, alarm monitoring, and per-DS0 CAS/CCS signaling for trunk-side connectivity. Use Value: Four independent T1 ports reduce component count versus discrete solutions while maintaining full per-channel configurability and diagnostic visibility. |
Use Scenario: Interfacing four T1 tributaries to a centralized TDM switch ASIC in a modular carrier card architecture. IC Role / Device Role / Timing Role: DS21Q352B+ acts as the T1-to-parallel-TDM bridge, converting serial T1 streams into synchronized 8.192MHz backplane data using hardware carry chain. Use Value: Eliminates need for external glue logic or FPGA-based concatenation; deterministic latency and jitter-free alignment across all four channels. |
| Remote Terminal Unit | Legacy PBX Gateway |
Use Scenario: Providing T1 connectivity for remote cell site controllers requiring robust line monitoring and loopback diagnostics. IC Role / Device Role / Timing Role: DS21Q352B+ performs full T1 physical layer termination, frame synchronization, loss-of-signal detection, and hardware-based AIS/LOS generation. Use Value: On-chip elastic stores absorb timing variations between T1 lines and host processor; reduces software overhead for slip management. |
Use Scenario: Bridging legacy T1-based PBX systems to VoIP gateways with minimal latency and bit-error-free transport. IC Role / Device Role / Timing Role: DS21Q352B+ handles T1 line interfacing, CAS signaling extraction (E&M, FXO), and HDLC framing for protocol translation modules. Use Value: Hardware signaling support offloads CPU; per-DS0 control enables granular voice channel mapping and supervision state tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q552B+ | 5V supply operation; identical pinout and feature set but higher power consumption and incompatible voltage rails | Required where legacy 5V system infrastructure prohibits 3.3V adoption; not suitable for mixed-voltage or low-power designs | Select DS21Q552B+ only when board-level 5V analog/digital supplies are already present and voltage translation is impractical. |
| DS21Q354B+ | E1 (2.048 Mbps) support instead of T1; same 3.3V supply, pinout, and MCM architecture | Deployed in European/Asian E1-centric networks; incompatible with T1 framing, line coding (HDB3 vs. B8ZS), and clock rates | Choose DS21Q354B+ for E1-only deployments; migration from DS21Q352B+ requires firmware and line interface reconfiguration. |
Compared with DS21Q552B+ and DS21Q354B+, the DS21Q352B+ uniquely balances low-voltage operation with North American T1 compliance - enabling direct integration into 3.3V telecom edge platforms without level-shifting or redesign.
Availability
DS21Q352B+ is available at Aetrix Electronics and suitable for telecom access multiplexers, TDM backplane interfaces, remote terminal units, and legacy PBX gateways requiring stable component supply and long-term industrial availability.
Supply support for DS21Q352B+ 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 semiconductor company specializing in precision analog, mixed-signal, and high-reliability interface solutions for industrial, communications, and automotive markets.
The DS21Q352B+ belongs to Maxim's legacy T1/E1 transceiver product line, designed specifically for space-constrained, multi-channel telecom infrastructure equipment requiring consolidated line interface and framing functionality.
FAQ
What is the supply voltage requirement for DS21Q352B+?
The DS21Q352B+ operates from a nominal 3.3V ±0.3V digital supply (DVDD), with separate 3.3V analog supplies for receive (RVDD) and transmit (TVDD) sections. All three domains must be independently decoupled using recommended capacitor networks per the datasheet - mixing 5V supplies or sharing rails between domains violates specification and risks functional failure.
Does DS21Q352B+ support E1 framing or only T1?
The DS21Q352B+ supports T1 only - it is based on the DS21352 die and explicitly designated for T1 applications in the selection guide. E1 functionality is provided by the pin-compatible DS21Q354B+, which uses DS21354 die. Attempting E1 operation on DS21Q352B+ will result in framing errors and loss of synchronization due to incompatible clock rates and line coding.
How many independent T1 channels does DS21Q352B+ provide?
The DS21Q352B+ provides four completely independent T1 transceiver channels (SCT1–SCT4), each with its own line interface, framer, elastic store, signaling engine, and parallel host interface. Channels operate autonomously - no shared resources constrain concurrent configuration or real-time performance.
Is DS21Q352B+ pin-compatible with DS21Q552B+?
Yes, DS21Q352B+ and DS21Q552B+ share identical 256-ball MCM BGA footprints and pin assignments, enabling drop-in replacement in layouts supporting either 3.3V or 5V supply schemes. However, voltage domain routing, decoupling, and level-shifting must be redesigned when swapping between them due to fundamental supply incompatibility.
What JTAG capabilities does DS21Q352B+ offer?
The DS21Q352B+ implements full IEEE 1149.1 JTAG boundary scan with dedicated JTCLK, JTDI, JTMS, and JTRST* pins. It provides four independent JTDO outputs (JTDO2–JTDO4 plus primary JTDO), allowing hierarchical testing and fault isolation per SCT - critical for validating interconnect integrity in dense telecom modules.
DS21Q352B+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 256-BGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Transceiver
- Interface:
- T1
- Number of Circuits:
- 4
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-BGA (27x27)
DS21Q352B+ FAQ
1.How can I place an order for DS21Q352B+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21Q352B+ 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 DS21Q352B+ reliable?
The price and inventory of DS21Q352B+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21Q352B+ is usually 5 days.
3.What payment methods are accepted for DS21Q352B+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21Q352B+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21Q352B+?
DS21Q352B+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21Q352B+ 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 DS21Q352B+?
For technical support, including DS21Q352B+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21Q352B+ requirements.
6.How does Aetrix verify that DS21Q352B+ is sourced from the original manufacturer or authorized distributors?
All DS21Q352B+ 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 DS21Q352B+ meets industry standards.
7.What is the process for return or replacement of DS21Q352B+?
All DS21Q352B+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21Q352B+, 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 DS21Q352B+ part is unused and in its original packaging.
Return procedure for DS21Q352B+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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