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Analog Devices Inc./Maxim Integrated DS21554L+
- Part No.:
- DS21554L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21554L+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
DS21554L+ from Maxim Integrated is a 5V single-chip E1 transceiver (SCT) implementing full CEPT PCM-30/ISDN-PRI line interface functionality. It performs AMI/HDB3 clock/data recovery, G.703 waveshaping for 75Ω coax and 120Ω twisted-pair, 32-bit or 128-bit crystal-less jitter attenuation, FAS/CAS/CCS/CRC4 framing, and HDLC-controlled Sa-bit or DS0 channel handling. It operates in 0°C to +70°C industrial temperature range and targets E1 line cards in telecom access equipment.
For engineers reviewing the DS21554L+ datasheet, DS21554L+ pinout, DS21554L+ application, or DS21554L+ equivalent, this page delivers verified technical context on jitter attenuation placement, elastic store clock independence, hardware-based signaling reinsertion, IEEE 1149.1 boundary scan support, and G.703/G.704/G.823 compliance - all critical for E1 framer selection and backplane timing integration.
Technical Context
The DS21554L+ integrates independent transmit and receive paths with dual two-frame elastic stores synchronized to asynchronous backplane clocks (RSYSCLK/TSYSCLK) up to 8.192MHz. Its framer locates frame/multiframe boundaries using FAS, CAS, CCS, or CRC4 formats and supports hardware-based signaling insertion/extraction aligned with CRC-4 multiframe structure.
Jitter attenuation is selectable between 32-bit and 128-bit depth and configurable in either transmit or receive data path. The on-chip 8.192MHz clock synthesizer eliminates external crystal requirement, and IEEE 1149.1 JTAG enables boundary-scan testability without requiring system-level reset or functional interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±5% - Enables direct compatibility with legacy 5V telecom control planes and eliminates level-shifting overhead. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade E1 line interface modules in central office and remote terminal applications. |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - Determines phase noise suppression bandwidth; 128-bit mode provides tighter jitter filtering for long-haul or noisy environments. |
| Elastic Store Clock Input | RSYSCLK/TSYSCLK up to 8.192MHz - Allows connection to standard PCM backplane clocks without external PLLs or frequency translators. |
| Receive Sensitivity | 0 to –43dB - Supports operation over 2km of 22AWG twisted-pair cable without repeaters or line build-out amplification. |
| 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 with global E1 infrastructure and carrier-grade certification requirements. |
| HDLC Buffer Size | 64-byte - Sufficient for full Sa-bit message exchange or sub-DS0 packetized signaling without host CPU intervention. |
Pinout & Package
DS21554L+ is housed in a 100-pin LQFP package (14mm × 14mm, 0.5mm pitch), compatible with standard surface-mount assembly processes and thermal management for telecom line card density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RRING / RTIP | Receive Line Interface Inputs | Differential analog inputs for transformer-coupled E1 AMI/HDB3 waveform; support 0 to –43dB sensitivity with internal active filter compensation. |
| TRING / TTIP | Transmit Line Interface Outputs | Differential outputs driving 75Ω coax or 120Ω twisted-pair per G.703; include programmable line build-out and open-drain option. |
| RSYSCLK / TSYSCLK | Asynchronous Backplane Clock Inputs | Independent clock inputs for receive/transmit elastic stores; accept 1.544MHz, 2.048MHz, 4.096MHz, or 8.192MHz for flexible PCM bus interfacing. |
| D0–D7 | Parallel Control Port Data Bus | 8-bit bidirectional data bus supporting Intel- or Motorola-style timing; enables single-controller management of multiple E1 lines via multiplexed or nonmultiplexed addressing. |
| RCL / RLOS / RRA / RAIS | Alarm Status Outputs | Open-drain alarm indicators for Carrier Loss, Loss of Sync, Remote Alarm, and AIS - each interrupt-capable on state change per ETS 300 233. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates external 32.768MHz crystal requirement while maintaining <1.5UI peak-to-peak jitter at output under worst-case line conditions. |
| Dual independent elastic stores | Enables simultaneous synchronization to different backplane clocks (e.g., 8.192MHz receive + 2.048MHz transmit), decoupling line timing from system timing domains. |
| Hardware-based signaling reinsertion | Allows real-time CAS/Sa-bit reinsertion into backplane multiframe sync without host CPU involvement, reducing latency and software overhead. |
| IEEE 1149.1 JTAG boundary scan | Supports production test and field diagnostics without functional initialization; enables pin-level interconnect verification pre- and post-assembly. |
| Per-channel code generation & loopback | Provides individual DS0-level fault isolation and test signal injection in both transmit and receive paths, essential for automated line testing. |
Applications
| Access Multiplexer | E1 Line Card |
|---|---|
Use Scenario: Aggregating multiple TDM voice/data streams onto a single E1 trunk for DSLAM or MSAN edge deployment. IC Role / Device Role / Timing Role: DS21554L+ acts as primary E1 line interface transceiver, performing clock recovery, framing, and HDLC-controlled Sa-bit signaling for channel-associated service management. Use Value: Enables full G.704-compliant frame alignment and CRC4 multiframe monitoring while supporting hardware-based signaling freeze interrupts for rapid fault detection. |
Use Scenario: Modular E1 interface board in carrier-class remote terminal units serving business PBX or cellular base station backhaul. IC Role / Device Role / Timing Role: DS21554L+ serves as dual-path framer/formatter with independent elastic stores, synchronizing recovered E1 data to local 8.192MHz backplane clock and generating compliant transmit waveforms. Use Value: Delivers –43dB receive sensitivity and programmable line build-out to operate reliably across 0–2km cable lengths without external amplifiers or equalizers. |
| Network Monitoring Tap | Legacy Protocol Gateway |
Use Scenario: Non-intrusive E1 traffic monitoring node extracting DS0 channels for protocol analysis or lawful intercept. IC Role / Device Role / Timing Role: DS21554L+ operates in receive monitor mode with RCLKO/RDATA outputs providing raw bipolar stream; line interface decoupled from framer to preserve signal integrity. Use Value: Provides access to unprocessed receive data between line interface and framer, enabling bit-level inspection without altering original framing or introducing latency. |
Use Scenario: Bridging legacy ISDN-PRI equipment to modern IP-based call controllers using CAS or CCS signaling mapping. IC Role / Device Role / Timing Role: DS21554L+ functions as signaling-aware E1 transceiver, extracting Si/Sa bits and inserting CAS messages via HDLC controller with 64-byte buffers. Use Value: Eliminates need for external signaling processors by integrating hardware-based CAS reinsertion and Sa-bit HDLC framing with multiframe-aligned buffer management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21554LN+ | Same functionality and pinout, but rated for –40°C to +85°C extended temperature range. | Suitable for outdoor cabinets, mobile base stations, or industrial telecom enclosures requiring wider thermal margin. | Select DS21554LN+ when operating ambient exceeds +70°C or requires automotive-grade reliability qualification. |
| DS21354L+ | 3.3V supply version with identical feature set, pinout, and register map; differs only in voltage tolerance and internal regulator design. | Targets newer low-voltage telecom platforms where 5V rails are unavailable or power efficiency is prioritized. | Choose DS21354L+ only if system power architecture mandates 3.3V operation and thermal/power budget permits lower drive capability. |
Compared with DS21554LN+ and DS21354L+, the DS21554L+ offers optimal balance of industrial temperature compliance, 5V interface compatibility, and proven field reliability in commercial E1 line cards - making it the default choice where legacy 5V infrastructure and cost-sensitive volume deployment are key constraints.
Availability
DS21554L+ is available at Aetrix Electronics and suitable for E1 line cards, access multiplexers, and telecom protocol gateways requiring stable component supply, long-term lifecycle support, and traceable sourcing for carrier-grade deployments.
Supply support for DS21554L+ 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, computing, and industrial markets.
The DS21554L+ belongs to Maxim's E1/T1 transceiver product line, designed specifically for CEPT-compliant telecom infrastructure requiring integrated clock recovery, framing, signaling, and jitter management in a single IC.
FAQ
What is the supply voltage requirement for DS21554L+?
The DS21554L+ operates exclusively from a 5V ±5% supply rail. It is not compatible with 3.3V systems. This distinguishes it from the pin-compatible DS21354L+, which uses a 3.3V supply. The 5V architecture ensures robust noise immunity and drive strength for legacy telecom backplanes, and internal regulation maintains stable core voltage across load variations. DS21554L+ must be powered within this range to guarantee full G.703 waveshaping compliance and jitter attenuation performance.
Does DS21554L+ support both FAS and CRC4 framing modes?
Yes, DS21554L+ fully supports FAS, CAS, CCS, and CRC4 framing formats as defined in ITU-T G.704 and G.706. The framer automatically detects and locks to any of these structures, and multiframe alignment is maintained with hardware-assisted resynchronization logic. CRC4 multiframe mode enables precise Sa/Si bit extraction aligned to the 16-frame sequence, while FAS mode provides basic frame alignment for simpler applications. Configuration is register-controlled and does not require external components.
Can DS21554L+ operate without an external crystal?
Yes, DS21554L+ incorporates an on-chip 8.192MHz clock synthesizer that eliminates the need for an external 32.768MHz crystal. This crystal-less jitter attenuation architecture meets G.823 jitter transfer and generation requirements without external timing components. The synthesizer derives its reference from internal oscillators, and jitter attenuation depth (32-bit or 128-bit) is software-selectable. This reduces BOM count and improves reliability in vibration-prone telecom environments where crystal microphonics can degrade performance.
How does DS21554L+ handle alarm generation and reporting?
DS21554L+ generates and reports RCL (Remote Carrier Loss), RLOS (Remote Loss of Sync), RRA (Remote Alarm Indication), and RAIS (Remote AIS) alarms per ETS 300 233 and ITU-T G.732. Each alarm output is open-drain and interrupt-capable on state change. Alarms are detected in hardware with configurable thresholds and can trigger status register flags or dedicated pins. The device also supports automatic RAI generation compliant with ETS 300 011, ensuring interoperability with European carrier networks without host processor intervention.
Is DS21554L+ pin-compatible with earlier Maxim E1 transceivers?
Yes, DS21554L+ is pin-compatible with DS2154, DS2152, DS21352, and DS21552 single-chip transceivers. This allows drop-in replacement in existing designs without PCB layout changes. Register maps and control sequences are backward-compatible, enabling reuse of firmware developed for prior generations. However, new features like interleaved PCM bus operation, enhanced HDLC buffering, and JTAG boundary scan require updated driver initialization but do not affect mechanical or electrical footprint compatibility.
DS21554L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Single-Chip Transceiver
- Interface:
- E1, HDLC, J1, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21554L+ FAQ
1.How can I place an order for DS21554L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21554L+ 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 DS21554L+ reliable?
The price and inventory of DS21554L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21554L+ is usually 5 days.
3.What payment methods are accepted for DS21554L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21554L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21554L+?
DS21554L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21554L+ 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 DS21554L+?
For technical support, including DS21554L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21554L+ requirements.
6.How does Aetrix verify that DS21554L+ is sourced from the original manufacturer or authorized distributors?
All DS21554L+ 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 DS21554L+ meets industry standards.
7.What is the process for return or replacement of DS21554L+?
All DS21554L+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21554L+, 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 DS21554L+ part is unused and in its original packaging.
Return procedure for DS21554L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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