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Analog Devices Inc./Maxim Integrated DS21352LN+
- Part No.:
- DS21352LN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21352LN+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
DS21352LN+ from Maxim Integrated is a 3.3V T1 single-chip transceiver supporting DS1/ISDN-PRI/J1 line interface, long/short-haul LIU operation, crystal-less jitter attenuation (32- or 128-bit), and HDLC controller with 64-byte buffers configurable for FDL or DS0. It delivers -7.5dB/-15dB/-22.5dB CSU line build-outs and operates across -40°C to +85°C for telecom access equipment.
For engineers reviewing the DS21352LN+ datasheet, DS21352LN+ pinout, DS21352LN+ application, or DS21352LN+ equivalent, key selection criteria include T1 framer compliance (ANSI T1.403-1995, ITU G.703/G.704), dual elastic store support for asynchronous backplanes up to 8.192MHz, IEEE 1149.1 JTAG boundary scan, and pin compatibility with DS2152/DS21354/DS21554 SCTs.
Technical Context
The DS21352LN+ integrates independent transmit and receive paths with clock recovery circuitry that adapts automatically to T1 line lengths from 0 to over 6000 feet. Its framer locates D4 (SLC-96) and ESF multiframe boundaries while extracting/inserting robbed-bit signaling and FDL data.
It features dual two-frame elastic stores enabling connection to asynchronous backplanes at 1.544MHz, 2.048MHz, or bursty 8.192MHz RSYSCLK/TSYSCLK; an 8.192MHz RCLK-synchronized clock output; and programmable in-band loop code generation/detection (1–8 bits) including CSU-specific codes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - Enables low-power CMOS operation compatible with modern telecom control planes. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial-grade deployment in outdoor cabinets and central office environments. |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - Reduces accumulated timing jitter on recovered T1 data without external crystal reference. |
| Line Build-Out Options | -7.5dB, -15dB, -22.5dB - Configurable CSU output drive levels matching legacy and modern T1 line impedance requirements. |
| Elastic Store Clock Range | Up to 8.192MHz asynchronous backplane clock - Supports high-throughput interleaved PCM bus operation with frame/byte mode flexibility. |
| HDLC Buffer Size | 64-byte configurable buffers - Enables reliable FDL or DS0 packet handling without external FIFOs. |
| Standards Compliance | ANSI T1.403-1995, T1.231-1993; ITU G.703/G.704/G.706/G.823; I.431 - Ensures interoperability with global T1 infrastructure. |
Pinout & Package
DS21352LN+ is housed in a 100-pin LQFP package (14 mm × 14 mm), RoHS-compliant, with 3.3V digital and analog supply domains separated for noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RCHBLK | Receive Channel Block | Indicates active channel block status during receive framing; used for synchronization handshaking with backplane logic. |
| 8MCLK | 8.192 MHz Clock Output | Synthesized clock locked to RCLK - provides precise timing reference for downstream HDLC or monitoring circuits. |
| RCL | Receive Carrier Loss | Open-drain alarm output asserting low on loss of valid T1 signal - directly interfaces with system-level fault management logic. |
| INT* | Interrupt Output | Active-low interrupt signaling state changes in RLOS, RRA, RAIS, or signaling data - reduces polling overhead in host processor systems. |
| TLINK / TSIG | Transmit Link Data / Signaling Input | Parallel PCM data path (TLINK) and dedicated signaling channel (TSIG) enable hardware-based robbed-bit insertion without CPU intervention. |
| RRING / RTIP | Receive Analog Ring/Tip Inputs | Differential analog inputs accepting AMI/B8ZS waveforms - require transformer coupling per T1 line interface standards. |
| TTIP / TRING | Transmit Analog Tip/Ring Outputs | Differential bipolar outputs driving T1 lines via external transformer - support both DSX-1 short-haul and CSU long-haul configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates need for external crystal oscillator while maintaining <1.5UI peak-to-peak jitter on recovered T1 data. |
| Dual elastic store architecture | Enables seamless bridging between T1 line rate (1.544MHz) and non-synchronous backplane clocks up to 8.192MHz. |
| IEEE 1149.1 JTAG boundary scan | Supports production test and in-system diagnostics without requiring additional test fixtures or probe access. |
| Programmable in-band loop code | Generates/detects 1–8-bit loop codes including AT&T TR62411-compliant CSU patterns for remote line testing. |
| Hardware signaling reinsertion | Reinserts extracted robbed-bit signaling into backplane multiframe sync - offloads real-time processing from host CPU. |
Applications
| Channel Bank Interface | T1 Line Card |
|---|---|
|
Use Scenario: Aggregating 24 DS0 channels from multiple T1 lines into a centralized switching fabric using asynchronous backplane interconnect. IC Role / Device Role / Timing Role: DS21352LN+ acts as T1 framer, line interface unit, and elastic store bridge - recovering line clock, inserting framing, and aligning data to backplane timing. Use Value: Dual elastic stores absorb frequency offset between T1 line clock and 8.192MHz backplane clock, preventing bit slips and ensuring error-free channel mapping. |
Use Scenario: Deploying modular T1 line cards in carrier-class DSLAMs or multiservice access platforms requiring field-upgradeable firmware and diagnostic capability. IC Role / Device Role / Timing Role: DS21352LN+ serves as full-function T1 transceiver with integrated HDLC controller and JTAG test access - enabling in-field loopback, alarm injection, and FDL monitoring. Use Value: On-chip IEEE 1149.1 boundary scan and per-channel idle/loopback reduce test time by >40% versus external test equipment during manufacturing and field maintenance. |
| ISDN PRI Gateway | Remote Terminal Unit |
|
Use Scenario: Converting ISDN Primary Rate Interface (PRI) traffic to IP-based voice/data services in enterprise PBX gateways. IC Role / Device Role / Timing Role: DS21352LN+ terminates T1 PRI physical layer, extracts B-channel payloads and D-channel signaling, and presents them via parallel bus to media gateway controller. Use Value: HDLC controller configured for FDL operation handles D-channel Layer 2 framing, eliminating need for external protocol engine and reducing BOM count. |
Use Scenario: Providing T1 connectivity in unattended remote terminal units deployed in cellular base station sites with wide temperature variation (-40°C to +85°C). IC Role / Device Role / Timing Role: DS21352LN+ functions as ruggedized T1 transceiver with extended temperature grade, crystal-less jitter attenuation, and robust alarm reporting (RLOS, RRA, RAIS). Use Value: -40°C to +85°C qualification and built-in carrier loss detection ensure continuous operation in harsh outdoor enclosures without thermal derating or external clock stabilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21552LN+ | 5V supply version with identical pinout and feature set; higher power consumption and reduced noise margin vs. 3.3V DS21352LN+. | Used where legacy 5V backplane infrastructure exists; not suitable for new low-voltage designs targeting <1W per channel. | Select DS21552LN+ only when existing 5V power delivery and level-shifting are already in place. |
| DS21354LN+ | Enhanced variant with added D4/ESF auto-detection, CRC6 calculation per Japanese standard, and improved signaling freeze capability. | Required for deployments needing automatic multiframe format negotiation or JTTA-compliant CRC verification in Japanese carrier networks. | Choose DS21354LN+ when future-proofing against evolving regional signaling requirements beyond baseline ANSI/ITU compliance. |
Compared with DS21552LN+, DS21352LN+ offers lower power and better noise immunity at 3.3V; compared with DS21354LN+, it provides cost-optimized implementation for fixed-format D4/ESF systems without advanced auto-negotiation or CRC6 needs.
Availability
DS21352LN+ is available at Aetrix Electronics and suitable for telecom access equipment, T1 line cards, ISDN PRI gateways, and remote terminal units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS21352LN+ 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 ICs for communications, industrial, and automotive markets.
The DS21352LN+ belongs to Maxim's SCT (Single-Chip Transceiver) family, designed specifically for carrier-grade T1/E1 line interface applications requiring integration of framer, LIU, jitter attenuation, and HDLC control in a single 100-pin LQFP device.
FAQ
What is the operating voltage range for DS21352LN+?
The DS21352LN+ operates exclusively at 3.3V ±5%, with separate DVDD, RVDD, and TVDD supply domains. This 3.3V requirement distinguishes it from the 5V DS21552LN+ variant and ensures compatibility with modern low-voltage telecom control planes. The DS21352LN+ does not support dual-voltage operation or 5V tolerance on any pin.
Does DS21352LN+ support both D4 and ESF framing formats?
Yes, DS21352LN+ fully supports both D4 (SLC-96) and ESF multiframe structures. Its framer detects and locks to either format automatically based on incoming line pattern recognition, and it extracts/inserts robbed-bit signaling or FDL data accordingly. Configuration registers allow manual override if needed, but auto-detection is enabled by default.
How does the crystal-less jitter attenuator in DS21352LN+ function without an external crystal?
The DS21352LN+ uses an internal VCO/PLL architecture referenced to the recovered RCLK signal to synthesize stable 8.192MHz and 8XCLK outputs. Its jitter attenuator operates in either 32-bit or 128-bit depth mode, filtering phase noise from the recovered T1 clock without requiring an external crystal oscillator - reducing BOM cost and board space.
Is DS21352LN+ pin-compatible with earlier Maxim T1 transceivers?
Yes, DS21352LN+ is pin-compatible with DS2152, DS21354, DS21554, and DS21552 devices in the same 100-pin LQFP package. Signal assignments, power pin locations, and control port layout match exactly, enabling drop-in replacement in existing designs - though voltage supply (3.3V vs. 5V) and feature enablement must be verified in software.
What backplane clock frequencies does DS21352LN+ support for elastic store operation?
DS21352LN+ supports elastic store operation with RSYSCLK and TSYSCLK inputs at 1.544MHz, 2.048MHz, or bursty clocks up to 8.192MHz. The device accommodates variable-rate backplane timing through its dual elastic store architecture, allowing phase alignment between T1 line data and asynchronous system clocks without data loss or buffer overflow.
DS21352LN+ 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:
- HDLC, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21352LN+ FAQ
1.How can I place an order for DS21352LN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21352LN+ 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 DS21352LN+ reliable?
The price and inventory of DS21352LN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21352LN+ is usually 5 days.
3.What payment methods are accepted for DS21352LN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21352LN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21352LN+?
DS21352LN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21352LN+ 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 DS21352LN+?
For technical support, including DS21352LN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21352LN+ requirements.
6.How does Aetrix verify that DS21352LN+ is sourced from the original manufacturer or authorized distributors?
All DS21352LN+ 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 DS21352LN+ meets industry standards.
7.What is the process for return or replacement of DS21352LN+?
All DS21352LN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21352LN+, 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 DS21352LN+ part is unused and in its original packaging.
Return procedure for DS21352LN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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