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Analog Devices Inc./Maxim Integrated DS21352L
- Part No.:
- DS21352L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21352L.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
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Product details
Overview
DS21352L 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 DSX-1 and CSU line build-outs (-7.5dB, -15dB, -22.5dB) and supports 8.192MHz clock output locked to RCLK for telecom access equipment.
For engineers reviewing the DS21352L datasheet, DS21352L pinout, DS21352L application, or DS21352L equivalent, this device serves as a full-featured T1 framer/transceiver with elastic store slip buffers, JTAG boundary scan, programmable in-band loop code generation/detection, and interoperability with D4/ESF framing standards per ANSI T1.403-1995, ITU G.703/G.704, and I.431.
Technical Context
The DS21352L integrates independent transmit and receive data paths with dual two-frame elastic stores enabling asynchronous backplane interfacing up to 8.192MHz. Its framer locates D4 (12-frame) and ESF (24-frame) boundaries while extracting/inserting robbed-bit signaling and FDL data.
Line interface functionality includes automatic clock/data recovery over 0–6000 ft cable lengths, programmable line build-out selection, and transformer-coupled bipolar analog I/O (TTIP/TRING, RTIP/RRING). The jitter attenuator is configurable in either path, and the HDLC controller supports both DS0 channel-level and facility-level FDL operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - enables low-power operation in telecom line cards without level-shifting for digital control logic. |
| Data Rate | 1.544 Mbps (T1) - fully compliant with ANSI T1.403-1995 and ITU G.703 for North American T1 infrastructure. |
| Jitter Attenuation | 32-bit or 128-bit selectable - suppresses incoming jitter on recovered RCLK before downstream timing distribution. |
| Line Build-Out | -7.5dB, -15dB, -22.5dB - configurable CSU/DSX-1 drive strength matching legacy and modern T1 line impedance requirements. |
| Elastic Store Depth | Dual two-frame buffers - absorbs phase/frequency mismatch between recovered T1 clock and asynchronous 1.544/2.048/8.192MHz backplane clocks. |
| HDLC Buffer Size | 64-byte FIFO - supports full FDL message handling and DS0 channel data encapsulation without external buffering. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade telecom access and central office edge applications. |
Pinout & Package
DS21352L uses a 100-pin LQFP package (14 mm × 14 mm) with 3.3V supply and mixed-signal pin segregation: analog receive (RTIP/RRING/RVDD/RVSS), analog transmit (TTIP/TRING/TVDD/TVSS), digital I/O (D0–D7, A0–A6, CS*, RD*, WR*, INT*), and dedicated timing/control pins (RCLK, TCLK, RSYSCLK, TSYSCLK, 8MCLK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RCHBLK | Receive Channel Block Indicator | Active-high signal indicating current channel block boundary in receive PCM stream. |
| 8MCLK | 8.192 MHz Clock Output | Synthesized clock locked to RCLK; used for backplane synchronization or auxiliary timing distribution. |
| RCL | Receive Carrier Loss Flag | Open-drain output asserting when no valid T1 signal detected at RTIP/RRING inputs. |
| INT* | Interrupt Request Output | Active-low interrupt triggered on alarm state changes (RLOS, RRA, RAIS, RCL) or signaling events. |
| TPOSO / TNEGO | Transmit Bipolar Data Outputs | Differential analog outputs driving TTIP/TRING via coupling transformer for AMI/B8ZS line encoding. |
| RTIP / RRING | Receive Bipolar Data Inputs | Differential analog inputs accepting transformer-coupled T1 waveform for clock/data recovery. |
| TSYSCLK / RSYSCLK | Asynchronous Backplane Clock Inputs | Accept 1.544MHz, 2.048MHz, or bursty up to 8.192MHz clocks for elastic store synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates need for external crystal oscillator while maintaining <1.5UI peak-to-peak jitter at 1.544Mbps. |
| IEEE 1149.1 JTAG boundary scan | Enables in-system test and debug of interconnect integrity without physical probe access. |
| Per-channel loopback and idle code insertion | Allows individual DS0 channel diagnostics and maintenance signaling without disrupting other channels. |
| Programmable in-band loop code (1–8 bits) | Supports CSU-compliant loopback initiation and detection across all T1 framing formats (D4/ESF). |
| Interleaved PCM bus operation | Reduces backplane bandwidth by multiplexing multiple T1 streams onto shared 8-bit data bus. |
Applications
| Channel Bank Interface | T1 Access Multiplexer |
|---|---|
|
Use Scenario: Aggregating 24 DS0 voice channels from legacy PBX or channel banks into a T1 trunk. IC Role / Device Role / Timing Role: DS21352L acts as the line-side T1 framer/transceiver, recovering clock/data, performing D4/ESF framing, and inserting/extraction robbed-bit signaling. Use Value: Enables direct analog T1 interface with built-in line build-out and jitter attenuation-no external line driver or clock cleanup IC required. |
Use Scenario: Building compact T1/E1 access multiplexers for DSLAM or CMTS edge deployment. IC Role / Device Role / Timing Role: DS21352L provides full T1 physical layer termination, including CSU/DSX-1 compatibility, elastic store for backplane clock domain bridging, and HDLC-controlled FDL messaging. Use Value: Reduces BOM count by integrating framer, LIU, jitter attenuator, and HDLC controller in one 100-pin LQFP. |
| Remote Terminal Unit | Network Monitoring Tap |
|
Use Scenario: Deploying remote T1 termination points in outside plant cabinets with temperature variation and limited power. IC Role / Device Role / Timing Role: DS21352L operates as standalone T1 transceiver with carrier loss detection (RCL), alarm reporting (RLOS/RAIS), and programmable loop codes for field technician verification. Use Value: Industrial temperature grade (DS21352LN) and robust analog front-end support unattended operation over 0–85°C ambient range. |
Use Scenario: Non-intrusive monitoring of live T1 traffic for performance analysis or security auditing. IC Role / Device Role / Timing Role: DS21352L's receive monitor mode and protected interface capability allow passive tapping of bipolar data streams without breaking line continuity. Use Value: Enables real-time frame inspection and error counting (LCVCR/PCVCR/MOSCR) using internal status registers-no line interruption required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21552L | 5V supply version with identical pinout and feature set; higher power consumption and no 3.3V I/O compatibility. | Used where legacy 5V system rails exist and voltage translation is undesirable. | Select DS21552L only if board-level 5V supply is available and 3.3V logic interfacing is not required. |
| DS2152 | Predecessor with no interleaved PCM bus, no JTAG, no crystal-less jitter attenuator, and no HDLC controller. | Limited to basic D4 framing and lacks hardware signaling features and backplane flexibility. | Choose DS2152 only for cost-sensitive, non-upgradable legacy designs requiring minimal feature set. |
Compared with DS21552L and DS2152, the DS21352L offers native 3.3V operation, integrated HDLC, JTAG testability, and crystal-less jitter attenuation-making it optimal for new telecom access designs requiring lower power, higher integration, and production test coverage.
Availability
DS21352L is available at Aetrix Electronics and suitable for telecom access multiplexers, channel bank interfaces, remote terminal units, and network monitoring taps requiring stable component supply across commercial temperature grades.
Supply support for DS21352L 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) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for communications, industrial, and computing markets.
The DS21352L belongs to Maxim's SCT (Single-Chip Transceiver) product line, engineered specifically for T1/E1 line interface applications demanding full framer, LIU, jitter control, and embedded control integration in telecom infrastructure.
FAQ
What is the operating voltage range for DS21352L?
The DS21352L operates exclusively at 3.3V ±5%, with separate analog (RVDD/TVDD) and digital (DVDD) supply domains. This fixed 3.3V requirement distinguishes it from the pin-compatible 5V DS21552L variant and ensures compatibility with modern low-voltage telecom control planes. DS21352L does not support dual-supply or voltage-flexible operation.
Does DS21352L support both D4 and ESF framing formats?
Yes, DS21352L fully supports both D4 (12-frame superframe) and ESF (24-frame extended superframe) structures per ANSI T1.403-1995 and ITU G.704. Its framer automatically detects and locks to either format, extracts FDL data in ESF mode, and handles robbed-bit signaling in D4 mode-including Fs/Ft pattern recognition and reinsertion.
How does the elastic store function in DS21352L?
The DS21352L contains dual independent two-frame elastic stores-one on transmit and one on receive-that absorb phase and frequency differences between the recovered T1 clock (RCLK) and asynchronous backplane clocks (RSYSCLK/TSYSCLK). Each store supports 1.544MHz, 2.048MHz, or bursty up to 8.192MHz input clocks and enables reliable data transfer across clock domains without FIFO overflow/underflow.
Can DS21352L generate and detect in-band loop codes?
Yes, DS21352L includes a programmable in-band loop code generator and detector supporting code lengths from 1 to 8 bits, including AT&T TR62411-compliant CSU loop codes. This allows remote loopback initiation and verification directly over the T1 line without external test equipment or physical access to the far end.
Is DS21352L pin-compatible with earlier Maxim T1 transceivers?
Yes, DS21352L is pin-compatible with DS2152, DS2154, DS21354, and DS21554 single-chip transceivers in the same 100-pin LQFP package. This enables drop-in upgrades with software compatibility-retaining existing PCB layouts while adding crystal-less jitter attenuation, HDLC, JTAG, and interleaved PCM bus capabilities.
DS21352L 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:
- HDLC, T1
- 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)
DS21352L FAQ
1.How can I place an order for DS21352L through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21352L 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 DS21352L reliable?
The price and inventory of DS21352L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21352L is usually 5 days.
3.What payment methods are accepted for DS21352L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21352L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21352L?
DS21352L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21352L 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 DS21352L?
For technical support, including DS21352L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21352L requirements.
6.How does Aetrix verify that DS21352L is sourced from the original manufacturer or authorized distributors?
All DS21352L 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 DS21352L meets industry standards.
7.What is the process for return or replacement of DS21352L?
All DS21352L units undergo pre-shipment inspection (PSI). If there is an issue with DS21352L, 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 DS21352L part is unused and in its original packaging.
Return procedure for DS21352L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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