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Analog Devices Inc./Maxim Integrated DS21552L+
- Part No.:
- DS21552L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21552L+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,267
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Product details
Overview
DS21552L+ from Maxim Integrated is a 5V single-chip T1 transceiver supporting DS1/ISDN-PRI/J1 line interfaces with integrated framer, HDLC controller, dual elastic stores, crystal-less jitter attenuator, and IEEE 1149.1 JTAG boundary scan. It delivers DSX-1 and CSU line build-outs (–7.5 dB, –15 dB, –22.5 dB), supports D4 and ESF framing, and operates across 0°C to +70°C in 100-pin LQFP. Used in carrier-grade T1 channel banks and CSU/DSU equipment.
For engineers reviewing the DS21552L+ datasheet, DS21552L+ pinout, DS21552L+ application, or DS21552L+ equivalent, key selection considerations include its 5V supply compatibility, independent transmit/receive clock domains, 8.192 MHz RCLK-synchronized output, per-channel loopback capability, and support for interleaved PCM bus operation up to 8.192 MHz.
Technical Context
The DS21552L+ implements a fully autonomous receive path with analog AMI/B8ZS waveform recovery, adaptive clock/data recovery for cables up to 6000 ft, and programmable receive monitor mode with gain control. Its framer detects and generates RCL, RLOS, RRA, and RAIS alarms with state-change interrupt capability.
Transmit functionality includes independent elastic store buffering, configurable HDLC controller (64-byte buffers, FDL or DS0 mode), programmable in-band loop code generation/detection (1–8 bits), and waveshaping with selectable DSX-1 or CSU line drive profiles. The device supports both multiplexed and non-multiplexed 8-bit parallel control ports (Intel/Motorola).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±5% - Enables direct integration into legacy 5V T1 line interface systems without level-shifting. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade telecom infrastructure applications with stable thermal margin. |
| Line Build-Out | –7.5 dB, –15 dB, –22.5 dB - Programmable CSU output levels matching ANSI T1.403-1995 long-haul requirements. |
| Jitter Attenuation Depth | 32-bit or 128-bit selectable - Reduces incoming T1 line jitter before framing, improving multiframe sync stability. |
| HDLC Buffer Size | 64-byte configurable buffers - Supports full FDL message handling and DS0 data encapsulation without external RAM. |
| Elastic Store Clock Range | 1.544 MHz, 2.048 MHz, or bursty up to 8.192 MHz - Enables asynchronous backplane interfacing with TDM switches and DSPs. |
| Compliance Standards | ANSI T1.403-1995, T1.231-1993; ITU G.703/G.704/G.706/G.823; I.431 - Certified for global T1/E1 deployment. |
Pinout & Package
DS21552L+ is housed in a 100-pin LQFP package (14 mm × 14 mm) with 0.5 mm pitch, optimized for high-density T1 line card layouts and thermal dissipation in multi-channel systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RCHBLK | Receive Channel Block Output | Indicates active channel blocking on receive side - used for alarm-driven channel isolation in protection switching. |
| TCHBLK | Transmit Channel Block Output | Signals transmit-side channel block condition - enables coordinated failover in redundant line cards. |
| 8MCLK | 8.192 MHz Clock Output | Synthesized clock locked to RCLK - provides precise timing reference for downstream TDM buffers or codec interfaces. |
| INT* | Interrupt Output (Active Low) | Asserts on RCL/RLOS/RRA/RAIS state change - eliminates polling overhead in real-time alarm monitoring firmware. |
| TSYNC / RSYNC | Transmit/Receive Sync I/O | Frame-aligned synchronization signals - essential for deterministic timing in multi-device T1 aggregation systems. |
| LIUC | Line Interface Connect Input | Enables/disables analog line interface circuitry - allows software-controlled power gating during standby or diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates external crystal oscillator - reduces BOM count and board space while maintaining <1.5 UI peak-to-peak jitter at output. |
| Dual two-frame elastic stores | Compensates for ±200 ppm frequency offset between recovered T1 clock and backplane clock - prevents buffer underrun/overflow in asynchronous interconnects. |
| Programmable in-band loop codes | Generates/detects 1–8 bit loop codes including AT&T TR62411-compliant CSU patterns - enables standards-based remote line testing. |
| IEEE 1149.1 JTAG boundary scan | Supports production test and field diagnostics of solder joints and PCB traces - critical for high-reliability telecom hardware validation. |
| Interleaved PCM bus operation | Handles byte- or frame-mode interleaving up to 8.192 MHz - simplifies connection to TI TMS320C54x or ADSP-218x DSPs without glue logic. |
Applications
| Channel Bank | CSU/DSU |
|---|---|
Use Scenario: Aggregating 24 DS0 channels from multiple T1 lines into a centralized switching fabric. IC Role / Device Role / Timing Role: Primary T1 line interface IC performing clock recovery, framing, HDLC processing, and elastic store buffering. Use Value: Eliminates need for discrete framer, jitter cleaner, and HDLC controller - reduces component count by ≥7 parts per T1 port. |
Use Scenario: Providing standards-compliant T1 termination and loopback testing in managed service provider edge routers. IC Role / Device Role / Timing Role: Full-function CSU implementing line build-out, in-band loop code generation, and alarm reporting. Use Value: Meets AT&T TR54016 and ITU G.703 requirements out-of-box - accelerates regulatory certification by 8–12 weeks. |
| Remote Terminal Unit | T1 Network Monitor |
Use Scenario: Deploying compact, fanless T1 demarcation units in outside plant cabinets. IC Role / Device Role / Timing Role: Low-power T1 transceiver with programmable receive sensitivity (0 dB to –36 dB) and monitor port capability. Use Value: Operates reliably over 6000-ft cable runs without repeaters - extends reach of central office services to rural locations. |
Use Scenario: Real-time T1 signal integrity analysis using passive tap points on live lines. IC Role / Device Role / Timing Role: Line interface unit decoupled from framer - enables bipolar data stream monitoring without disrupting traffic. Use Value: Allows non-intrusive error injection and CRC6 checking per Japanese standard - supports advanced SLA verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21552LN+ | Extended temperature range (–40°C to +85°C); identical electrical specs and pinout. | Required for outdoor cabinet or industrial control applications with wider thermal cycling. | Select DS21552LN+ when operating ambient exceeds +70°C or requires automotive-grade reliability qualification. |
| DS2152L+ | Legacy 5V T1 transceiver; lacks HDLC controller, interleaved PCM bus, JTAG, and crystal-less jitter attenuator. | Suitable only for basic D4 framing without FDL/DS0 or diagnostic features. | Choose DS2152L+ only if backward compatibility with legacy firmware and minimal feature set are mandatory. |
Compared with DS21552L+, DS21552LN+ adds extended temperature operation without layout or firmware changes, while DS2152L+ omits critical modern features like JTAG and HDLC - making DS21552L+ the optimal balance of capability, compliance, and commercial-temperature suitability.
Availability
DS21552L+ is available at Aetrix Electronics and suitable for channel bank development, CSU/DSU manufacturing, and T1 network monitoring equipment requiring stable component supply across multi-year production cycles.
Supply support for DS21552L+ 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 leader specializing in precision analog, mixed-signal, and high-reliability communication ICs for telecom, industrial, and automotive markets.
The DS21552L+ belongs to Maxim's SCT (Single-Chip Transceiver) product line, engineered specifically for carrier-class T1/E1 line interface applications demanding full ANSI/ITU compliance, low-power operation, and diagnostic readiness.
FAQ
What voltage supply does the DS21552L+ require?
The DS21552L+ operates from a single 5V ±5% supply, with separate analog (RVDD/TVDD) and digital (DVDD) rails internally regulated. This eliminates need for external DC-DC converters in legacy 5V T1 line cards. All I/Os are 5V-tolerant, and the device maintains full functionality across the entire 4.75V–5.25V range specified in the DS21552L+ datasheet.
Does the DS21552L+ support both D4 and ESF framing formats?
Yes, the DS21552L+ natively supports both D4 (Superframe) and ESF (Extended Superframe) multiframe structures. Its framer automatically detects and locks to either format, extracts robbed-bit signaling or FDL data accordingly, and reports alarms including RLOS and RAIS per ANSI T1.403-1995. Frame alignment is maintained even during transitions between formats on the same line.
Can the DS21552L+ generate and detect in-band loop codes?
Yes, the DS21552L+ includes a programmable in-band loop code generator and detector supporting code lengths from 1 to 8 bits. It recognizes and initiates standard CSU loop codes per AT&T TR62411 and can be configured via register writes to insert idle codes or initiate remote loops - all without external logic or microcontroller intervention.
Is the DS21552L+ pin-compatible with earlier Maxim T1 transceivers?
Yes, the DS21552L+ is pin-compatible with DS2152/DS2154/DS21354/DS21554 single-chip transceivers. This allows drop-in replacement in existing designs, preserving PCB layout and connector assignments while enabling access to new features like JTAG, HDLC, and interleaved PCM bus - provided firmware is updated to leverage enhanced capabilities.
What is the purpose of the 8MCLK output on the DS21552L+?
The 8MCLK output on the DS21552L+ is an 8.192 MHz clock synthesized and phase-locked to the recovered RCLK input. It serves as a clean, jitter-attenuated timing reference for downstream components such as codecs, TDM switches, or FPGA-based time-slot interchange units - eliminating need for external clock synthesizers in tightly synchronized T1 systems.
DS21552L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- 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)
DS21552L+ FAQ
1.How can I place an order for DS21552L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21552L+ 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 DS21552L+ reliable?
The price and inventory of DS21552L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21552L+ is usually 5 days.
3.What payment methods are accepted for DS21552L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21552L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21552L+?
DS21552L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21552L+ 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 DS21552L+?
For technical support, including DS21552L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21552L+ requirements.
6.How does Aetrix verify that DS21552L+ is sourced from the original manufacturer or authorized distributors?
All DS21552L+ 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 DS21552L+ meets industry standards.
7.What is the process for return or replacement of DS21552L+?
All DS21552L+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21552L+, 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 DS21552L+ part is unused and in its original packaging.
Return procedure for DS21552L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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