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Analog Devices Inc./Maxim Integrated DS21Q354BN
- Part No.:
- DS21Q354BN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 256-BGA
- Datasheet:
-
DS21Q354BN.pdf
- Description:
- IC TELECOM INTERFACE 256BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
DS21Q354BN from Dallas Semiconductor is a quad-channel E1 transceiver Multi-Chip Module (MCM) operating at 3.3V, integrating four DS21354 die for full TDM line interface, framing, elastic store, and hardware signaling support per channel. It delivers 32 DS0 channels per E1 link (2.048 Mbps), supports short/long-haul line interfaces, and provides IEEE 1149.1 JTAG boundary scan. Used in carrier-grade access multiplexers and E1 concentrators requiring high-density TDM aggregation.
For engineers reviewing the DS21Q354BN datasheet, DS21Q354BN pinout, DS21Q354BN application, or DS21Q354BN equivalent, key selection criteria include E1 framing compliance (G.704/G.706), 3.3V supply compatibility, 256-ball BGA package footprint, JTAG testability, and per-channel RLOS/LOTC alarm generation - all confirmed for DS21Q354BN in the December 1998 preliminary datasheet.
Technical Context
The DS21Q354BN implements four independent E1 transceivers in a single MCM, each comprising a line interface unit (LIU), framer with HDLC controller, elastic store, and per-DS0 channel control logic. Each channel supports E1 framing (CRC-4 multiframe), alarm detection (RLOS/LOTC), and hardware-based CAS/MF signaling.
It operates with separate analog and digital power domains (RVDD/TVDD/DVDD), uses differential analog I/O (RTIP/RRING/TTIP/TRING), and supports concatenated 8.192 MHz backplane output via 8MCLKx signals. JTAG boundary scan is implemented across all four SCTs with dedicated JTDO outputs per section.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quad E1 transceiver MCM - integrates four DS21354 die for full E1 physical layer + framing + signaling per channel. |
| Supply Voltage | 3.3V CMOS core with 5V-tolerant I/O - enables direct interfacing to legacy 5V logic without level shifters. |
| Data Rate | 2.048 Mbps per E1 link - compliant with ITU-T G.703 physical layer and G.704 frame structure. |
| Channel Count | 4 independent E1 transceivers - each supports 32 DS0 time slots and full multiframe alignment (G.706). |
| Package | 256-ball BGA (27 mm × 27 mm) - high-density footprint optimized for telecom line card layouts. |
| JTAG Support | IEEE 1149.1 boundary scan with per-SCT JTDO (JTDO2–JTDO4) and shared JTMS/JTCLK/JTRST* - enables board-level test and debug of all four transceivers. |
| Analog Interface | Differential tip/ring I/O (RTIP/RRING/TTIP/TRING) per channel - supports both short-haul (120Ω) and long-haul (75Ω) E1 line configurations. |
Pinout & Package
DS21Q354BN uses a 256-ball fine-pitch BGA package (27 mm × 27 mm, 1.27 mm ball pitch), with dedicated power/ground balls per functional domain (DVDD/DVSS, RVDD/RVSS, TVDD/TVSS) and replicated signal sets for four independent transceiver sections (SCT1–SCT4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RLOS/LOTC1–4 | Alarm Output | Per-channel open-drain status indicating Receive Loss of Sync or Loss of Transmit Clock - directly drives LED indicators or FPGA interrupt inputs. |
| RCLK1–4, TCLK1–4 | Clock I/O | Asynchronous receive/transmit clock interfaces per channel - enable independent timing domain bridging between LIU and framer logic. |
| RTIP1–4 / RRING1–4 | Analog Input | Differential E1 line receiver inputs - accept ±2.37V peak-to-peak E1 signals with on-chip termination and gain control. |
| TTIP1–4 / TRING1–4 | Analog Output | Differential E1 line driver outputs - deliver ±2.37V peak-to-peak compliant E1 signals with programmable slew rate and output impedance. |
| CS1*–CS4* | Chip Select | Independent active-low chip selects for each SCT - allow discrete addressing or parallel configuration of all four transceivers. |
| JTDO2–JTDO4 | JTAG Output | Dedicated boundary-scan data outputs for SCT2–SCT4 - enable daisy-chained JTAG testing without multiplexing. |
Key Features
| Feature | Design Value |
|---|---|
| Quad E1 Integration | Four complete E1 transceivers in one MCM reduce PCB area by >70% vs. discrete solutions and eliminate inter-die skew in backplane concatenation. |
| Hardware Signaling Engine | On-chip CAS/MF signaling support per DS0 channel offloads CPU and ensures deterministic call setup/clearing in SS7 gateways. |
| Elastic Store Buffering | Per-channel elastic store absorbs E1 network jitter (up to ±100 ppm) while maintaining synchronous TDM output for backplane interconnect. |
| Concatenated Backplane Mode | All four E1 streams merge into a single 8.192 MHz parallel bus (8MCLKx) - simplifies interface to ASICs/FPGAs handling aggregated TDM traffic. |
| Pin Compatibility | Shares identical 256-ball BGA footprint with DS21Q352 (T1), DS21Q552/DS21Q554 - enables single PCB design supporting T1/E1 variants via BOM change only. |
Applications
| Central Office Access Multiplexer | Enterprise E1 Gateway |
|---|---|
Use Scenario: Aggregating 16 E1 lines from remote DSLAMs into a SONET OC-3 uplink in a Class 5 switch environment. IC Role / Device Role / Timing Role: DS21Q354BN serves as the line-side E1 transceiver bank, performing physical layer recovery, frame alignment, and alarm monitoring before passing DS0s to a TDM switch fabric. Use Value: Four-channel density reduces slot count per shelf; hardware CAS support enables direct integration with legacy SS7 signaling stacks without software intervention. |
Use Scenario: Providing E1 connectivity for VoIP media gateways deployed in large corporate PBX systems. IC Role / Device Role / Timing Role: DS21Q354BN terminates E1 trunks, extracts individual DS0s, and presents them as parallel 8-bit data + frame sync to a DSP subsystem for transcoding. Use Value: Elastic store buffers absorb wander from telco clocks; 3.3V operation lowers thermal load in fanless gateway enclosures. |
| Mobile Base Station Controller | SDH Add-Drop Multiplexer |
Use Scenario: Interfacing legacy BTS sites over E1 to a 3G RNC using ATM over TDM transport. IC Role / Device Role / Timing Role: DS21Q354BN handles E1 physical layer, CRC-4 multiframe processing, and alarm injection (AIS, RAI) for OAM&P in the BSC's tributary card. Use Value: Per-channel RLOS/LOTC outputs feed real-time fault isolation logic; JTAG scan enables in-system verification during field upgrades. |
Use Scenario: Adding/dropping E1 tributaries from STM-1 payloads in metro SDH nodes with strict space constraints. IC Role / Device Role / Timing Role: DS21Q354BN acts as the E1 tributary interface, converting SDH-mapped VC-12 payloads to native E1 electrical signals with G.704 framing. Use Value: Pin-compatible footprint allows reuse of existing BGA land pattern across T1/E1 variants; 27×27 mm size fits dense line-card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21Q554 | 5V supply version with identical pinout and feature set - requires separate 5V rail and higher power dissipation. | Suitable where legacy 5V system power architecture exists and 3.3V conversion is impractical. | Select DS21Q554 only if board-level 5V supply is already available; DS21Q354BN preferred for new low-power designs. |
| Exar XR22064 | Single-channel E1 transceiver in 128-pin LQFP - no MCM integration, no concatenated backplane mode, no JTAG per channel. | Used in cost-sensitive, lower-port-count applications where board space is less constrained. | Choose XR22064 when scalability beyond four E1 links is needed or when JTAG test coverage per channel is not required. |
Compared with DS21Q554, DS21Q354BN reduces system power by ~40% and eliminates external level shifters; versus XR22064, it delivers 4× channel density and integrated backplane aggregation but requires BGA assembly capability.
Availability
DS21Q354BN is available at Aetrix Electronics and suitable for central office access multiplexers, enterprise E1 gateways, mobile base station controllers, and SDH add-drop multiplexers requiring stable component supply across extended product lifecycles.
Supply support for DS21Q354BN 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
Dallas Semiconductor (now part of Maxim Integrated) specialized in precision analog, timing, and communications ICs for telecom and industrial infrastructure markets.
The DS21Q354BN belongs to the Quad T1/E1 Transceiver MCM product line, designed specifically to address high-density E1/T1 line card requirements in carrier-class access and transport equipment.
FAQ
What is the primary function of the DS21Q354BN?
The DS21Q354BN is a quad-channel E1 transceiver Multi-Chip Module that integrates four DS21354 die to provide full E1 physical layer interface, framing (G.704/G.706), elastic store buffering, hardware CAS/MF signaling, and alarm generation per channel. It operates at 3.3V and delivers 32 DS0 channels per E1 link, making it ideal for telecom access equipment requiring high port density and deterministic TDM processing.
Does the DS21Q354BN support both short-haul and long-haul E1 line configurations?
Yes, the DS21Q354BN supports both short-haul (120Ω balanced) and long-haul (75Ω unbalanced) E1 line configurations through its differential RTIP/RRING and TTIP/TRING analog I/O pins. Each channel includes configurable line interface circuitry to match impedance and signal levels per ITU-T G.703 requirements, with on-chip termination and gain control verified in the December 1998 preliminary datasheet.
Is the DS21Q354BN pin-compatible with other devices in the DS21Qxxx family?
Yes, the DS21Q354BN shares an identical 256-ball BGA footprint with DS21Q352 (quad T1, 3.3V), DS21Q552 (quad T1, 5V), and DS21Q554 (quad E1, 5V). This pin compatibility allows a single PCB layout to support multiple T1/E1 variants via BOM-level changes only - confirmed in the "Selection Guide" and "Pin Compatible" statements of the December 1998 datasheet.
What JTAG capabilities does the DS21Q354BN provide?
The DS21Q354BN implements IEEE 1149.1 JTAG boundary scan with dedicated JTDO outputs for SCT2–SCT4 (JTDO2, JTDO3, JTDO4), plus shared JTMS, JTCLK, JTDI, and JTRST* pins. This enables full boundary-scan testing of all four transceiver sections independently or in daisy-chain configuration - a key requirement for high-reliability telecom line cards validated in the preliminary datasheet.
Can the DS21Q354BN be used in concatenated backplane mode?
Yes, the DS21Q354BN supports concatenation of all four E1 transceivers into a single 8.192 MHz parallel data stream using the 8MCLK1–8MCLK4 outputs. This mode simplifies connection to downstream ASICs or FPGAs handling aggregated TDM traffic and is explicitly documented in the "Features" section and Figure 1 schematic of the December 1998 datasheet.
DS21Q354BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 256-BGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Transceiver
- Interface:
- E1
- 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)
DS21Q354BN FAQ
1.How can I place an order for DS21Q354BN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21Q354BN 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 DS21Q354BN reliable?
The price and inventory of DS21Q354BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21Q354BN is usually 5 days.
3.What payment methods are accepted for DS21Q354BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21Q354BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21Q354BN?
DS21Q354BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21Q354BN 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 DS21Q354BN?
For technical support, including DS21Q354BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21Q354BN requirements.
6.How does Aetrix verify that DS21Q354BN is sourced from the original manufacturer or authorized distributors?
All DS21Q354BN 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 DS21Q354BN meets industry standards.
7.What is the process for return or replacement of DS21Q354BN?
All DS21Q354BN units undergo pre-shipment inspection (PSI). If there is an issue with DS21Q354BN, 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 DS21Q354BN part is unused and in its original packaging.
Return procedure for DS21Q354BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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