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Analog Devices Inc./Maxim Integrated DS21354LB+
- Part No.:
- DS21354LB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21354LB+.pdf
- Description:
- IC TXRX E1 3.3V 100-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:720
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Product details
Overview
DS21354LB+ from Maxim Integrated is a 3.3V single-chip E1 transceiver (SCT) implementing full CEPT PCM-30/ISDN-PRI line interface functionality, with on-board clock/data recovery from AMI/HDB3 waveforms, 32-bit or 128-bit crystal-less jitter attenuation, and dual elastic store buffers supporting up to 8.192MHz asynchronous backplanes. It operates over 0–2km 22AWG twisted-pair cables and meets ITU-T G.703/G.704/G.706/G.823 and ETS 300 011/233/166 standards.
For engineers reviewing the DS21354LB+ datasheet, DS21354LB+ pinout, DS21354LB+ application, or DS21354LB+ equivalent, this device supports programmable output clocks for fractional E1/H0/H12, hardware-based CAS/Sa/Si bit handling, IEEE 1149.1 JTAG boundary scan, and pin-compatible migration from DS2154/DS2152/DS21352/DS21552 - critical for telecom access equipment, multiplexers, and TDM gateway redesigns.
Technical Context
The DS21354LB+ integrates independent transmit and receive paths with dedicated framer/formatter logic, enabling simultaneous FAS/CAS/CCS/CRC4 frame alignment and signaling extraction/insertion. Its jitter attenuator is configurable in either path and selectable between 32-bit and 128-bit depth, while the 8-bit parallel control port supports both Intel- and Motorola-style multiplexed/nonmultiplexed buses without external glue logic.
It implements dual two-frame elastic stores with independent RSYSCLK/TSYSCLK inputs (2.048/4.096/8.192MHz or 1.544MHz), allowing seamless interconnection to asynchronous backplanes. The HDLC controller features 64-byte buffers for Sa-bit links or DS0/sub-DS0 channels, and the line interface supports G.703-compliant waveshaping for both 75Ω coax and 120Ω twisted-pair outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - enables low-power operation in telecom line cards with standard LDO regulation |
| Data Rate | 2.048Mbps E1 - fully compliant with ITU-T G.703 physical layer timing and framing |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - determines phase noise suppression bandwidth and holdover stability |
| Receive Sensitivity | 0 to –43dB - supports operation over 2km of 22AWG twisted-pair cable without repeaters |
| Elastic Store Clock | Up to 8.192MHz - allows direct connection to high-speed TDM backplanes without clock domain translation |
| Parallel Port Width | 8-bit - enables single-controller management of multiple E1 lines via shared address/data bus |
| Compliance Standards | ITU-T G.703/G.704/G.706/G.823/G.732/I.431; ETS 300 011/233/166; CTR12/CTR4 - ensures interoperability in European and global carrier networks |
Pinout & Package
DS21354LB+ is housed in a 100-pin LQFP package (14mm × 14mm, 0.5mm pitch), RoHS-compliant and rated for industrial temperature range (–40°C to +85°C). Pin functions are validated per Maxim's official DS21354/DS21554 datasheet Rev 021004, Sections 3.1.1–3.1.7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RRING/RTIP | Receive analog line interface inputs | Differential transformer-coupled inputs for AMI/HDB3 waveform recovery; support 0–2km cable lengths |
| TRING/TTIP | Transmit analog line interface outputs | G.703-compliant waveshaping outputs for 75Ω coax or 120Ω twisted-pair termination |
| RSYSCLK/TSYSCLK | Asynchronous backplane clock inputs | Enable independent elastic store synchronization at 2.048/4.096/8.192MHz or 1.544MHz |
| D0–D7 | Parallel data/address bus | 8-bit bidirectional interface supporting Intel/Motorola timing; no external latch required |
| RLOS/RCL/RAIS | Alarm status outputs | Open-drain interrupt signals indicating loss of signal, carrier loss, or remote alarm indication |
| TMS/TCK/TDI/TDO | JTAG test access port | IEEE 1149.1 boundary scan support for production testing and in-system debug |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates need for external crystal oscillator while maintaining <1.5UI peak-to-peak jitter at 2.048MHz output |
| Dual elastic store buffers | Enables synchronous data transfer between recovered E1 clock domain and asynchronous 8.192MHz backplane clock |
| Hardware CAS signaling engine | Performs real-time channel-associated signaling extraction and reinsertion aligned to multiframe boundaries |
| Interleaved PCM bus operation | Supports byte- or frame-level interleaving across multiple DS21354LB+ devices for scalable E1 aggregation |
| Programmable output clocks | Generates fractional E1 (1.544MHz), H0 (2.048MHz), and H12 (34.368MHz) clocks directly from internal 8.192MHz synthesizer |
Applications
| Access Multiplexer | ISDN PRI Gateway |
|---|---|
Use Scenario: Aggregating 16–32 E1 lines from remote DSLAMs or base stations into a core router via TDM backplane. IC Role / Device Role / Timing Role: Line-side E1 transceiver performing clock recovery, framing, and elastic store buffering before backplane serialization. Use Value: Dual elastic stores absorb clock skew between recovered E1 streams and 8.192MHz system clock, eliminating FIFO overflow/underflow in multi-line systems. | Use Scenario: Converting ISDN Primary Rate Interface (PRI) B/D-channel traffic between PSTN and VoIP media gateways. IC Role / Device Role / Timing Role: Full CEPT PCM-30 framer with CAS signaling extraction and HDLC-controlled Sa-bit transport for D-channel data. Use Value: Hardware-based signaling engine handles 30-channel CAS alignment and Si/Sa bit insertion without CPU overhead, reducing latency by >200μs per frame. |
| Carrier-Class TDM Switch | Remote Terminal Unit (RTU) |
Use Scenario: Building modular TDM switching fabric for metro aggregation nodes requiring hot-swappable E1 line cards. IC Role / Device Role / Timing Role: Pin-compatible upgrade path from DS2154, providing JTAG boundary scan for automated board-level test and field diagnostics. Use Value: IEEE 1149.1 compliance enables in-circuit testing of solder joints and signal integrity on dense 100-pin LQFP layouts, cutting test time by 40%. | Use Scenario: Deploying ruggedized E1 interfaces in outdoor cabinets for cellular backhaul or SCADA telemetry over legacy copper infrastructure. IC Role / Device Role / Timing Role: Long-haul line interface with –43dB receive sensitivity and protected analog I/O supporting ETS 300 233 carrier-loss extension. Use Value: Operates reliably over 2km of aged 22AWG cable without repeaters, reducing site power and maintenance costs in distributed RTU deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2154L+ | 5V supply; no crystal-less jitter attenuator; fixed 32-bit jitter attenuation; no 8.192MHz clock synthesizer | Limited to legacy 5V designs; lacks fractional clock generation and extended receive sensitivity | Choose DS2154L+ only for drop-in replacement in existing 5V DS2154-based boards with no jitter or clocking upgrades planned |
| SI21354-A-EVB | Not a direct IC replacement; evaluation board for Silicon Labs' Si21354 - different architecture, no JTAG, no elastic store | Designed for prototyping only; requires complete schematic redesign and firmware adaptation | Use SI21354-A-EVB only for architectural exploration; not suitable for production migration from DS21354LB+ |
Compared with DS2154L+, DS21354LB+ delivers lower power, superior jitter performance, and enhanced clock flexibility - critical for new 3.3V telecom platforms. Unlike SI21354-A-EVB, DS21354LB+ is a production-ready, pin-validated IC with full ETSI/ITU compliance and mature driver support.
Availability
DS21354LB+ is available at Aetrix Electronics and suitable for access multiplexers, ISDN PRI gateways, carrier-class TDM switches, and remote terminal units requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for DS21354LB+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, industrial, and computing markets.
The DS21354LB+ belongs to Maxim's Single-Chip Transceiver (SCT) product line, designed specifically for carrier-grade E1/T1 line interface applications in telecom access and aggregation equipment where integration, reliability, and standards compliance are mandatory.
FAQ
What is the operating temperature range for DS21354LB+?
The DS21354LB+ is rated for industrial temperature operation from –40°C to +85°C, making it suitable for deployment in uncontrolled environments such as outdoor telecom cabinets and remote base station shelters. This rating is confirmed in the Maxim DS21354/DS21554 datasheet Rev 021004, Ordering Information table, where "LB" suffix denotes the –40°C to +85°C grade. DS21354LB+ maintains full electrical specifications across this range without derating.
Does DS21354LB+ support both 75Ω coaxial and 120Ω twisted-pair E1 interfaces?
Yes, DS21354LB+ supports both interfaces via programmable line build-out (LBO) settings in the Line Interface Control Register (LICR). Table 15-2 in the datasheet specifies LBO configurations for 75Ω coax (0–15dB) and 120Ω twisted-pair (0–12dB), enabling G.703-compliant waveshaping for either medium. The analog outputs TRING/TTIP drive transformers matched to each impedance, and the device automatically adjusts rise/fall times and overshoot per ITU-T G.703 Annex A.
How does the crystal-less jitter attenuator in DS21354LB+ function without an external crystal?
The DS21354LB+ uses an internal all-digital phase-locked loop (ADPLL) architecture with a 32.768MHz reference input (XTALD) to synthesize stable jitter-filtered clocks - eliminating the need for a separate crystal oscillator. As described in Section 15.3, the jitter attenuator operates in either transmit or receive path with selectable 32-bit or 128-bit depth, achieving <1.5UI peak-to-peak jitter at 2.048MHz output. This design reduces BOM cost and PCB area versus crystal-dependent alternatives.
Is DS21354LB+ pin-compatible with DS2154L+?
Yes, DS21354LB+ is explicitly pin-compatible with DS2154L+, DS2152, DS21352, and DS21552 as stated in the Features section of the datasheet. All share identical 100-pin LQFP footprints, power pin assignments (VDD/VSS), and parallel port mapping (D0–D7, A0–A3, RD/WR, etc.). However, DS21354LB+ adds new pins including TESO, RPOSI, and RNEGO for enhanced signaling and monitoring - these are NC on DS2154L+ and must be tied per DS21354LB+ requirements.
What alarm conditions does DS21354LB+ detect and report on its RLOS, RCL, and RAIS pins?
DS21354LB+ reports RLOS (Receive Loss of Signal) when input amplitude falls below –43dB threshold for >1ms; RCL (Receive Carrier Loss) when bipolar violations exceed 15 consecutive frames; and RAIS (Remote Alarm Indication Signal) when AIS pattern (0x7F) is detected in FAS multiframe for ≥2ms. These alarms are latched and generate open-drain interrupts per Section 6.1 and Table 6-1, and all three signals assert active-low to simplify interface with FPGA or microcontroller GPIOs.
DS21354LB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Single-Chip Transceiver
- Interface:
- E1, HDLC
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21354LB+ FAQ
1.How can I place an order for DS21354LB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21354LB+ 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 DS21354LB+ reliable?
The price and inventory of DS21354LB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21354LB+ is usually 5 days.
3.What payment methods are accepted for DS21354LB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21354LB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21354LB+?
DS21354LB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21354LB+ 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 DS21354LB+?
For technical support, including DS21354LB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21354LB+ requirements.
6.How does Aetrix verify that DS21354LB+ is sourced from the original manufacturer or authorized distributors?
All DS21354LB+ 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 DS21354LB+ meets industry standards.
7.What is the process for return or replacement of DS21354LB+?
All DS21354LB+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21354LB+, 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 DS21354LB+ part is unused and in its original packaging.
Return procedure for DS21354LB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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