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Analog Devices Inc./Maxim Integrated DS21352LB+
- Part No.:
- DS21352LB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21352LB+.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS21352LB+ 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 selectable), and HDLC controller with 64-byte buffers configurable for FDL or DS0 mode. It delivers DSX-1 and CSU line build-outs (-7.5dB, -15dB, -22.5dB) and operates across 0–6000 ft cable lengths in telecom access equipment.
For engineers reviewing the DS21352LB+ datasheet, DS21352LB+ pinout, DS21352LB+ application, or DS21352LB+ 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 8.192 MHz, IEEE 1149.1 JTAG boundary scan, and pin compatibility with DS2152/DS2154/DS21354/DS21554 SCTs.
Technical Context
The DS21352LB+ integrates independent transmit and receive data paths with programmable jitter attenuators placed either in transmit or receive chains. Its framer detects and inserts robbed-bit signaling, FDL, and D4/ESF multiframe structures while monitoring RCL, RLOS, RRA, and RAIS alarms with state-change interrupt capability.
It supports interleaved PCM bus operation (byte/frame mode), hardware-based signaling reinsertion, CRC6 calculation per Japanese standard, and decoupled line interface functionality-enabling optical/HDSL/NRZ interfacing, bipolar data stream monitoring, and controlled error injection into framing/CRC fields.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% digital/analog core; enables low-power CMOS operation in space-constrained telecom modules. |
| Data Rate | 1.544 Mbps (T1); fully compliant with ANSI T1.403-1995 and ITU G.703 for DS1 line interface. |
| Jitter Attenuation | Selectable 32-bit or 128-bit depth; crystal-less design eliminates external oscillator, reducing BOM count and layout area. |
| Line Build-Out | Configurable DSX-1 and CSU outputs: -7.5dB, -15dB, -22.5dB; supports both short-haul (≤600 ft) and long-haul (up to 6000 ft) deployments. |
| Elastic Store Clock | Accepts RSYSCLK/TSYSCLK up to 8.192 MHz; enables synchronization with bursty or asynchronous backplane clocks in multi-channel systems. |
| HDLC Buffer Size | 64-byte dual-port RAM; supports full-duplex FDL or DS0 packet handling without host CPU intervention. |
| Alarm Detection | Real-time RCL, RLOS, RRA, RAIS detection with edge-triggered INT* output; reduces firmware polling overhead. |
Pinout & Package
DS21352LB+ uses a 100-pin LQFP package (14 mm × 14 mm), RoHS-compliant, with 3.3V supply and 3.3V I/O voltage levels. Pin functions are validated per Maxim's official DS21352/DS21552 datasheet Rev. 12-10-98 through 8-16-99.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RING/RTIP | Receive analog differential input | Accepts transformer-coupled AMI/B8ZS waveform; supports -36 dBm to 0 dBm input sensitivity. |
| TRING/TTIP | Transmit analog differential output | Drives T1 line via coupling transformer; configurable for DSX-1 or CSU line build-out profiles. |
| RSYSCLK/TSYSCLK | Asynchronous backplane clock input | Enables elastic store alignment with non-T1 clocks up to 8.192 MHz; critical for multi-rate backplane interconnect. |
| INT* | Interrupt output | Active-low open-drain signal asserting on RCL/RLOS/RRA/RAIS state change; reduces host polling latency. |
| JTMS/JTCLK/JTDI/JTDO/JTRST | JTAG boundary scan interface | IEEE 1149.1-compliant test access port; enables production ICT, in-system debug, and structural verification. |
| D0–D7 / A0–A6 / RD* / WR* / CS* / BTS / MUX | Parallel control port | Intel/Motorola bus-compatible 8-bit interface; allows single host controller to manage multiple DS21352LB+ devices. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates external crystal oscillator, reducing component count and board area while maintaining <1.5 UI peak-to-peak jitter at 1.544 Mbps. |
| Dual elastic store buffers | Independent transmit/receive stores absorb phase/frequency mismatch between recovered T1 clock and asynchronous backplane clocks (≤8.192 MHz). |
| Hardware signaling reinsertion | Reinserts robbed-bit signaling into backplane multiframe sync without host CPU involvement, lowering latency and firmware load. |
| Programmable in-band loop codes | Generates/detects 1–8 bit in-band loop codes including AT&T TR62411 CSU patterns; enables remote line diagnostics without service interruption. |
| Decoupled line interface | Allows direct access to bipolar TX/RX data streams for monitoring, error injection, or optical/HDSL interface bridging-separate from framer logic. |
Applications
| Channel Bank Interface | T1 Access Multiplexer |
|---|---|
|
Use Scenario: Aggregating 24 DS0 channels from legacy PBX or remote terminal units onto a T1 trunk. IC Role / Device Role / Timing Role: DS21352LB+ acts as line interface unit (LIU) and framer-recovering clock/data, performing D4/ESF framing, and extracting/inserting robbed-bit signaling. Use Value: Supports both long-haul CSU and short-haul DSX-1 configurations in same hardware, enabling field-reconfigurable deployment without PCB change. |
Use Scenario: Building compact T1 multiplexers for DSLAM or fiber node aggregation in last-mile access networks. IC Role / Device Role / Timing Role: DS21352LB+ provides jitter-attenuated T1 interface, HDLC-controlled FDL channel, and elastic store buffering for 8.192 MHz backplane interconnect. Use Value: Enables deterministic latency and seamless integration with asynchronous ASIC/FPGA backplanes using interleaved PCM bus mode. |
| Remote Monitoring Tap | Carrier-Class ISDN-PRI Gateway |
|
Use Scenario: Non-intrusive T1 line monitoring in central office test points or demarcation boxes. IC Role / Device Role / Timing Role: DS21352LB+ operates in receive monitor mode with adjustable gain (0 dB to +20 dB), capturing bipolar data streams without disrupting live traffic. Use Value: Provides real-time frame error counting (LCVCR/PCVCR/MOSCR) and alarm status reporting via parallel port-no protocol stack required. |
Use Scenario: Implementing ISDN Primary Rate Interface (PRI) in enterprise gateways supporting 23B+D channels. IC Role / Device Role / Timing Role: DS21352LB+ handles physical layer T1 termination, B8ZS encoding/decoding, and FDL channel management for D-channel signaling. Use Value: Full ANSI T1.601 and ITU I.431 compliance ensures interoperability with telco switches; JTAG support simplifies field firmware updates. |
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, feature set, and register map; higher power consumption and no 3.3V I/O compatibility. | Required where legacy 5V system rails or mixed-voltage backplanes exist; not suitable for new 3.3V-only designs. | Select DS21552LN+ only when existing 5V infrastructure prohibits voltage translation or level-shifting. |
| DS21354LB+ | Pin-compatible superset with added features: enhanced HDLC controller, extended FDL support, and improved jitter tolerance per ITU G.823. | Preferred for next-generation deployments requiring stricter jitter performance or expanded signaling capabilities beyond DS21352LB+ scope. | Choose DS21354LB+ when future-proofing against evolving carrier requirements or adding FDL-based OAM&P functions. |
Compared with DS21352LB+, DS21552LN+ requires 5V supply and lacks 3.3V I/O compatibility, limiting use in modern low-voltage systems; DS21354LB+ offers extended FDL and jitter specs but increases cost-making DS21352LB+ optimal for cost-sensitive, standards-compliant T1 line cards where full DS21354 feature set is unused.
Availability
DS21352LB+ is available at Aetrix Electronics and suitable for telecom access equipment, T1 channel banks, and ISDN-PRI gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial deployment.
Supply support for DS21352LB+ 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 DS21352LB+ belongs to Maxim's SCT (Single-Chip Transceiver) product line, designed specifically for carrier-grade T1/E1 line interface applications requiring integrated framer, LIU, jitter attenuation, and HDLC control in minimal footprint.
FAQ
What is the operating temperature range for DS21352LB+?
The DS21352LB+ is rated for industrial temperature operation from -40°C to +85°C, as confirmed by Maxim's ordering information (DS21352LN variant). This range supports deployment in uncontrolled environments such as roadside cabinets, cell towers, and central office distribution frames where ambient temperatures exceed commercial limits. The DS21352LB+ maintains full electrical specifications-including jitter attenuation depth, line build-out accuracy, and elastic store timing-across this entire range.
Does DS21352LB+ support both D4 and ESF framing formats?
Yes, DS21352LB+ fully supports both D4 (Superframe) and ESF (Extended Superframe) multiframe structures. Its framer automatically detects and locks to either format, extracts/inserts robbed-bit signaling in D4 mode, and handles FPS, Fs, and FDL in ESF mode. This dual-format capability is verified in the device's functional description and timing diagrams (Figures 21-1 through 21-4), ensuring interoperability with legacy and modern T1 network elements.
Can DS21352LB+ operate without an external crystal?
Yes, DS21352LB+ features a crystal-less jitter attenuator architecture, eliminating the need for an external quartz crystal. Internal VCO/PLL circuitry synthesizes required clocks-including 8.192 MHz output locked to RCLK-using only the incoming T1 data stream. This is explicitly stated in the FEATURES section and validated in Figure 16-5 (Jitter Attenuation) and Section 16.3 of the datasheet.
Is DS21352LB+ pin-compatible with earlier Maxim T1 transceivers?
Yes, DS21352LB+ is pin-compatible with DS2152, DS2154, DS21354, and DS21554 single-chip transceivers, as confirmed in the FEATURES section ("Pin compatible with DS2152/54/354/554 SCTs"). This allows drop-in replacement in existing layouts, preserving PCB design integrity while upgrading to enhanced features like interleaved PCM bus operation and JTAG boundary scan.
What line build-out options does DS21352LB+ provide?
DS21352LB+ generates both DSX-1 and CSU line build-outs: -7.5dB, -15dB, and -22.5dB, selectable via the LICR register (Table 16-1). These profiles meet ANSI T1.403-1995 and ITU G.703 requirements for short-haul (≤600 ft) and long-haul (up to 6000 ft) installations. The line driver operates from TTIP/TRING pins and interfaces directly with standard T1 coupling transformers.
DS21352LB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Bulk
- 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)
DS21352LB+ FAQ
1.How can I place an order for DS21352LB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21352LB+ 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 DS21352LB+ reliable?
The price and inventory of DS21352LB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21352LB+ is usually 5 days.
3.What payment methods are accepted for DS21352LB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21352LB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21352LB+?
DS21352LB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21352LB+ 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 DS21352LB+?
For technical support, including DS21352LB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21352LB+ requirements.
6.How does Aetrix verify that DS21352LB+ is sourced from the original manufacturer or authorized distributors?
All DS21352LB+ 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 DS21352LB+ meets industry standards.
7.What is the process for return or replacement of DS21352LB+?
All DS21352LB+ units undergo pre-shipment inspection (PSI). If there is an issue with DS21352LB+, 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 DS21352LB+ part is unused and in its original packaging.
Return procedure for DS21352LB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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