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Analog Devices Inc./Maxim Integrated DS21554LN
- Part No.:
- DS21554LN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21554LN.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
DS21554LN from Maxim Integrated is a 5V, -40°C to +85°C industrial-grade E1 single-chip 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-/128-bit crystal-less jitter attenuation, FAS/CAS/CRC4 framing, and HDLC-controlled Sa-bit or DS0 channel handling. It serves in telecom access equipment, E1 multiplexers, and remote terminal units requiring robust long-haul line interfacing.
For engineers reviewing the DS21554LN datasheet, DS21554LN pinout, DS21554LN application, or DS21554LN equivalent, this page delivers verified technical context, exact pin functions, real-world E1 system roles, and validated alternative options - all grounded in Maxim's official DS21354/DS21554 documentation and ordering data.
Technical Context
The DS21554LN integrates independent transmit and receive paths with dual elastic stores supporting asynchronous backplane clocks up to 8.192MHz. Its line interface recovers clock/data from analog E1 waveforms (0 to –43dB sensitivity), supports programmable line build-out for 0–2km 22AWG cable, and generates G.703-compliant output waveforms for both 75Ω and 120Ω media.
It embeds an IEEE 1149.1 JTAG boundary-scan architecture, a 64-byte HDLC controller for Sa-bit or DS0 links, and hardware-based signaling with freeze/interrupt capability. The framer detects and generates RLOS, AIS, RAIS, and RRA alarms per ITU-T G.823 and ETS 300 011/233 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±5% - enables direct integration into legacy 5V telecom control planes without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for uncontrolled outdoor cabinets and industrial base stations. |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - reduces accumulated jitter before downstream clock distribution, meeting G.823 mask compliance. |
| Receive Sensitivity | 0 dBm to –43 dBm - supports operation over 2km of 22AWG twisted-pair without repeaters. |
| Line Interface Outputs | G.703-compliant 75Ω coax & 120Ω twisted-pair - eliminates need for external line drivers or transformers in standard E1 designs. |
| HDLC Buffer Size | 64-byte FIFO - sufficient for Sa-bit messaging or sub-DS0 packetized signaling without host CPU overhead. |
| Elastic Store Clock | Supports 1.544MHz, 2.048MHz, 4.096MHz, or 8.192MHz RSYSCLK - enables seamless interconnection to TDM backplanes with varying clock domains. |
Pinout & Package
DS21554LN is housed in a 100-pin LQFP package (14mm × 14mm, 0.5mm pitch), RoHS-compliant and rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RRING / RTIP | Receive Line Input | Differential analog input for transformer-coupled E1 AMI/HDB3 waveform; supports –43dBm sensitivity. |
| TRING / TTIP | Transmit Line Output | Differential analog output compliant with G.703 75Ω coax and 120Ω twisted-pair templates. |
| RSYSCLK / TSYSCLK | Asynchronous Backplane Clock Input | Accepts 1.544/2.048/4.096/8.192MHz clocks for elastic store synchronization across non-aligned timing domains. |
| D0–D7 | Parallel Control Port Data Bus | 8-bit bidirectional bus supporting Intel- or Motorola-style timing; enables single-controller management of multiple E1 lines. |
| RLOS / RRA / RAIS | Alarm Status Outputs | Open-drain active-low signals indicating loss of signal, remote alarm, and remote AIS - directly drive interrupt inputs or LEDs. |
| TMS / TCK / TDI / TDO | JTAG Test Access Port | IEEE 1149.1-compliant boundary scan interface for production test and in-system debug without intrusive probing. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates external crystal oscillator while delivering 32- or 128-bit attenuation depth in either TX or RX path per G.823 requirements. |
| Dual two-frame elastic stores | Enables connection to asynchronous TDM backplanes up to 8.192MHz without clock domain crossing logic or FIFO arbitration. |
| Hardware signaling with freeze interrupt | Generates CPU interrupt on Si/Sa bit change and holds signaling state during host latency - ensures no CAS frame corruption during read-modify-write cycles. |
| Four independent loopback modes | Supports framer, line interface, local, and remote loopbacks - enables layered validation from physical layer to HDLC stack without external test gear. |
| Programmable output clocks | Provides fractional E1, H0, and H12 clock outputs - simplifies clock tree design for multi-rate TDM systems sharing one DS21554LN. |
Applications
| Access Multiplexer | E1 Remote Terminal Unit |
|---|---|
|
Use Scenario: Aggregating 16–32 E1 lines from DSLAMs or fiber nodes into a central office via SDH/SONET. IC Role / Device Role / Timing Role: E1 line interface transceiver handling clock recovery, framing, and CAS extraction for each E1 tributary. Use Value: Single-chip integration reduces BOM count and PCB area versus discrete framer + line driver solutions; industrial temp grade ensures reliability in street cabinets. |
Use Scenario: Remote site termination for leased-line business services, providing E1 handoff to PBX or router. IC Role / Device Role / Timing Role: Full E1 PHY with G.703 waveshaping, AIS generation, and RAI alarm compliance per ETS 300 011. Use Value: Built-in line build-out and –43dBm sensitivity eliminate external amplifiers for 2km copper runs; JTAG support enables field firmware updates. |
| ISDN-PRI Gateway | Legacy Telecom Switch Interface |
|
Use Scenario: Converting PRI signaling between SS7/IP networks and legacy ISDN-PRI trunks in enterprise gateways. IC Role / Device Role / Timing Role: HDLC controller for Sa-bit processing and CAS signaling insertion/extraction synchronized to E1 frame boundaries. Use Value: 64-byte HDLC buffer and hardware-based signaling freeze prevent bit errors during high-load call setup; parallel port allows low-latency register access. |
Use Scenario: Interfacing modern control processors to aging Class-5 switches requiring E1 CAS or CCS signaling. IC Role / Device Role / Timing Role: Framer with CRC4 multiframe alignment, Si/Sa bit access, and per-channel code insertion for protocol translation. Use Value: Direct Si/Sa bit mapping and double-frame elastic store ensure deterministic timing for legacy switch handshake protocols; pin compatibility with DS2154 eases upgrade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar E1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21554L | Same silicon, 0°C to +70°C operating range; identical pinout and register map. | Restricted to commercial-temperature indoor equipment (e.g., central office shelves). | Select DS21554L only when ambient temperature remains within 0–70°C and cost optimization is prioritized over field deployment flexibility. |
| DS21354LN | 3.3V supply version with identical feature set, pinout, and industrial temperature rating. | Requires 3.3V power rail and level-shifted control interface; lower power consumption but incompatible with 5V-only systems. | Choose DS21354LN for new 3.3V designs targeting reduced thermal load and power budget; not a drop-in replacement for DS21554LN due to voltage mismatch. |
Compared with DS21554L and DS21354LN, the DS21554LN uniquely combines 5V operation with industrial temperature tolerance - making it the sole option for retrofitting legacy 5V E1 equipment deployed in unheated outdoor enclosures where voltage and thermal constraints preclude alternatives.
Availability
DS21554LN is available at Aetrix Electronics and suitable for telecom access multiplexers, E1 remote terminal units, ISDN-PRI gateways, and legacy switch interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS21554LN 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 high-reliability interface ICs for communications, industrial, and automotive markets.
The DS21554LN belongs to Maxim's E1/T1 transceiver product line, engineered specifically for carrier-grade telecom infrastructure requiring full G.703/G.704/G.823 compliance, long-haul line reach, and robust alarm handling in harsh environments.
FAQ
What is the primary function of the DS21554LN in an E1 system?
The DS21554LN serves as a complete E1 single-chip transceiver, performing analog AMI/HDB3 clock and data recovery, G.703-compliant waveshaping for 75Ω and 120Ω lines, FAS/CAS/CRC4 framing, HDLC-controlled Sa-bit or DS0 handling, and jitter attenuation. In a live E1 system, the DS21554LN bridges the physical line interface to the digital backplane, enabling reliable transmission and reception of 32-channel PCM-30 traffic with full alarm monitoring and signaling support.
Does the DS21554LN require an external crystal oscillator?
No, the DS21554LN features a crystal-less jitter attenuator with selectable 32-bit or 128-bit depth, eliminating the need for an external crystal. It uses internal PLL/VCO circuitry to achieve jitter filtering per ITU-T G.823 requirements. An optional 32.768MHz or 16.384MHz crystal may be used for enhanced stability in specific timing configurations, but it is not mandatory for basic jitter attenuation operation of the DS21554LN.
How does the DS21554LN handle E1 line faults such as loss of signal or remote alarm?
The DS21554LN continuously monitors the incoming E1 waveform and asserts dedicated open-drain outputs - RLOS (Receive Loss of Signal), RRA (Remote Alarm Indication), and RAIS (Remote AIS) - upon detection. These signals meet ETS 300 011 and ITU-T G.823 specifications and can trigger interrupts or drive status LEDs directly. The DS21554LN also generates AIS locally and supports automatic RAI assertion per ETS 300 011, ensuring interoperability with upstream network elements during fault conditions.
Is the DS21554LN pin-compatible with earlier Maxim E1 transceivers?
Yes, the DS21554LN is explicitly pin-compatible with the DS2154, DS2152, DS21352, and DS21552 single-chip transceivers, as confirmed in the device's "Features" section and ordering table. This allows direct replacement in existing PCB layouts without redesign, provided the 5V supply and industrial temperature range align with system requirements. Firmware and register-level control remain fully compatible, enabling seamless migration from legacy parts to the DS21554LN.
What types of signaling does the DS21554LN support, and how is it implemented?
The DS21554LN supports Channel-Associated Signaling (CAS), Common-Channel Signaling (CCS), and Additional (Sa) and International (Si) bit handling. CAS is extracted and inserted in time slot 16 under framer control; Sa/Si bits are accessed via dedicated registers aligned to CRC-4 multiframe boundaries. Hardware signaling mode provides freeze-on-change interrupt and reinsertion capability, while processor-based signaling allows full software control. All signaling operations are synchronized to E1 frame timing and supported natively by the DS21554LN's integrated HDLC controller and framer logic.
DS21554LN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21554LN FAQ
1.How can I place an order for DS21554LN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21554LN 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 DS21554LN reliable?
The price and inventory of DS21554LN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21554LN is usually 5 days.
3.What payment methods are accepted for DS21554LN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21554LN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21554LN?
DS21554LN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21554LN 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 DS21554LN?
For technical support, including DS21554LN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21554LN requirements.
6.How does Aetrix verify that DS21554LN is sourced from the original manufacturer or authorized distributors?
All DS21554LN 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 DS21554LN meets industry standards.
7.What is the process for return or replacement of DS21554LN?
All DS21554LN units undergo pre-shipment inspection (PSI). If there is an issue with DS21554LN, 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 DS21554LN part is unused and in its original packaging.
Return procedure for DS21554LN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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