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Analog Devices Inc./Maxim Integrated DS21552LN
- Part No.:
- DS21552LN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21552LN.pdf
- Description:
- IC TELECOM INTERFACE 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,510
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Product details
Overview
DS21552LN from Maxim Integrated is a 5V T1 single-chip transceiver supporting DS1/ISDN-PRI/J1 line interfaces, featuring crystal-less jitter attenuation (32/128-bit selectable), dual elastic store slip buffers for asynchronous backplanes up to 8.192MHz, HDLC controller with 64-byte buffers configurable for FDL or DS0 operation, and full ANSI T1.403-1995, ITU G.703/G.704 compliance. It serves as the core line interface unit in carrier-grade T1 channel banks and CSU/DSU equipment.
For engineers reviewing the DS21552LN datasheet, DS21552LN pinout, DS21552LN application, or DS21552LN equivalent, key selection criteria include its 100-pin LQFP package, -40°C to +85°C industrial temperature rating, independent transmit/receive clock domains, programmable in-band loop code generation (1–8 bits), and IEEE 1149.1 JTAG boundary-scan support for production testability.
Technical Context
The DS21552LN integrates a complete T1 framer, line interface unit (LIU), HDLC controller, and dual elastic stores - enabling simultaneous long-haul (CSU) and short-haul (DSX-1) operation with automatic cable-length adaptation up to 6000 feet. Its jitter attenuator is configurable in either transmit or receive path and synthesizes an 8.192MHz clock locked to RCLK.
It supports interleaved PCM bus operation (byte/frame mode), hardware-based signaling reinsertion, per-channel idle/loopback insertion, and decoupled LIU/framer architecture allowing direct access to bipolar data streams for monitoring or error injection. The parallel control port operates in Intel- or Motorola-compatible muxed/non-muxed modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±5% - enables direct integration into legacy 5V T1 infrastructure without level-shifting. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and outdoor telecom equipment deployment. |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - determines phase noise suppression bandwidth and holdover stability. |
| Elastic Store Clock Range | Up to 8.192MHz - supports high-speed asynchronous backplane interconnects including E1/T1 cross-connects. |
| Line Build-Out Options | -7.5dB, -15dB, -22.5dB - matches impedance and loss profiles of diverse copper plant configurations. |
| In-Band Loop Code Length | Programmable 1–8 bits - enables precise emulation of CSU loopbacks and FDL diagnostic sequences. |
| HDLC Buffer Size | 64-byte FIFO - accommodates full FDL messages or DS0 data frames without overflow in bursty traffic. |
| Compliance Standards | ANSI T1.403-1995, T1.231-1993; ITU G.703, G.704, G.706, G.823, I.431 - ensures interoperability with global TDM networks. |
Pinout & Package
DS21552LN is housed in a 100-pin LQFP package (14 mm × 14 mm), optimized for thermal dissipation and signal integrity in high-density telecom line cards. Pin functions are validated per Maxim's official DS21352/DS21552 datasheet Rev. 12-10-98 through Rev. 8-16-99.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RING/RTIP | Receive analog differential input | Accepts transformer-coupled AMI/B8ZS waveform from T1 line; supports 0 dB to –36 dB sensitivity. |
| TRING/TTIP | Transmit analog differential output | Drives T1 line via coupling transformer; configurable for CSU (-22.5dB) or DSX-1 line build-out. |
| RSYSCLK/TSYSCLK | Asynchronous backplane clock input | Enables elastic store synchronization to 1.544MHz, 2.048MHz, or bursty 8.192MHz clocks. |
| TCLKI/TCLKO | Transmit clock interface | Supports independent transmit clock domain; allows T1 framing synchronized to external timing source. |
| D0–D7 / AD0–AD7 | Parallel control port data/address | Muxed or non-muxed 8-bit bus compatible with Intel/Motorola microcontrollers for multi-channel management. |
| JTMS/JTCLK/JTDI/JTDO | JTAG boundary-scan interface | Enables IEEE 1149.1-compliant board-level test, debug, and in-system programming. |
| INT* | Interrupt output | Asserts on alarm state change (RLOS, RRA, RAIS, RCL) for real-time fault reporting. |
| 8MCLK | 8.192MHz clock output | Synthesized and phase-locked to recovered RCLK; used for backplane timing or HDLC baud rate derivation. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuation | Eliminates external crystal oscillator, reducing BOM count and PCB area while maintaining <1.5UI peak-to-peak jitter at 1.544MHz. |
| Dual elastic store slip buffers | Enables seamless bridging between T1 data rate (1.544Mbps) and asynchronous backplane clocks up to 8.192MHz without data loss. |
| Hardware signaling reinsertion | Reinserts robbed-bit or FDL signaling into multiframe sync without CPU intervention, offloading host processor. |
| Decoupled LIU and framer | Allows direct tap of bipolar transmit/receive data streams for protocol analyzers or error-injection test points. |
| Per-channel idle/loopback insertion | Enables individual DS0 channel diagnostics in multiplexed environments without affecting other channels. |
| Programmable in-band loop detection | Identifies and responds to standardized CSU loop codes (1–8 bits), enabling automated remote line testing. |
Applications
| Channel Bank | CSU/DSU Equipment |
|---|---|
|
Use Scenario: Aggregating 24 DS0 channels into T1 frames for central office switching. IC Role / Device Role / Timing Role: Primary T1 line interface transceiver handling framing, line build-out, clock recovery, and HDLC-controlled FDL messaging. Use Value: Integrates framer, LIU, and HDLC in one device, reducing component count by >40% versus discrete solutions while meeting ANSI T1.403 timing jitter limits. |
Use Scenario: Providing T1 termination and loopback diagnostics for enterprise WAN connections. IC Role / Device Role / Timing Role: Standalone CSU with programmable loop codes, carrier loss detection, and JTAG test access for field service. Use Value: Enables automated remote loop testing via in-band commands and real-time alarm interrupt reporting (RLOS, RAIS) without host software polling. |
| Multi-Service Access Platform | T1/E1 Cross-Connect System |
|
Use Scenario: Supporting mixed T1 and ISDN-PRI services on shared line cards. IC Role / Device Role / Timing Role: Dual-role transceiver configured for DS1 or ISDN-PRI physical layer, with independent TX/RX clock domains. Use Value: Eliminates need for separate T1 and PRI PHYs; same hardware supports both protocols via register configuration. |
Use Scenario: Synchronizing T1 data streams across asynchronous backplanes in modular cross-connect chassis. IC Role / Device Role / Timing Role: Elastic store buffer interfacing 1.544MHz T1 data to 8.192MHz backplane clock domain. Use Value: Absorbs frequency/phase misalignment between line and system clocks, preventing bit slips during hot-swap or clock source switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21552L | Same silicon, 0°C to +70°C temperature range; identical pinout and register map. | Restricted to commercial-temperature environments (e.g., indoor network closets). | Select DS21552L only when ambient operating conditions remain within 0–70°C and industrial qualification is not required. |
| DS21352LN | 3.3V supply version with identical feature set, pinout, and register compatibility; lower power consumption. | Requires level-shifting for 5V control buses; suited for new low-voltage designs prioritizing power efficiency. | Choose DS21352LN when migrating to 3.3V systems; firmware remains binary-compatible but power delivery must be revised. |
Compared with DS21552LN, DS21552L lacks extended temperature support but offers identical functionality at lower cost for benign environments, while DS21352LN provides 3.3V operation and reduced power draw but requires voltage translation in legacy 5V systems.
Availability
DS21552LN is available at Aetrix Electronics and suitable for carrier-grade channel banks, CSU/DSU equipment, multi-service access platforms, and T1/E1 cross-connect systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS21552LN 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 high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial markets.
The DS21552LN belongs to Maxim's SCT (Single-Chip Transceiver) family, designed specifically for integrated T1/E1 line interface applications where space, power, and time-to-market constraints demand full-featured, pin-compatible solutions.
FAQ
What is the operating temperature range of the DS21552LN?
The DS21552LN is rated for industrial operation from -40°C to +85°C. This extended range ensures reliable performance in outdoor cabinets, central office environments, and uncontrolled industrial settings where ambient temperatures exceed commercial-grade limits. The DS21552LN maintains full electrical specifications across this entire range, including jitter attenuation accuracy, line build-out consistency, and elastic store latency.
Does the DS21552LN require an external crystal oscillator?
No, the DS21552LN features a crystal-less jitter attenuator that eliminates the need for an external crystal. It derives stable timing from the recovered line clock (RCLK) and synthesizes internal clocks including 8.192MHz (8MCLK) and 8× clock (8XCLK). This reduces bill-of-materials cost and PCB footprint while maintaining compliance with ITU G.823 jitter transfer requirements.
Is the DS21552LN pin-compatible with earlier Maxim T1 transceivers?
Yes, the DS21552LN is pin-compatible with DS2152, DS2154, DS21354, and DS21554 single-chip transceivers. This allows drop-in replacement in existing designs without PCB layout changes, preserving mechanical fit, thermal profile, and signal routing. Firmware developed for those predecessors operates unchanged on DS21552LN due to identical register mapping and control logic.
How does the DS21552LN handle different T1 line lengths?
The DS21552LN automatically adapts to T1 line lengths from 0 feet to over 6000 feet using its integrated line interface unit (LIU) with active filtering and variable gain control. Its receive sensitivity spans 0 dB to –36 dB, and it supports programmable line build-out options (-7.5dB, -15dB, -22.5dB) to match cable loss characteristics - eliminating manual calibration or external components.
What standards does the DS21552LN comply with?
The DS21552LN complies with ANSI T1.403-1995 (DS1), ANSI T1.231-1993 (ISDN-PRI), AT&T TR 62411 and TR54016, and ITU-T G.703 (physical layer), G.704 (framing), G.706 (error detection), G.823 (jitter), and I.431 (ISDN). These certifications ensure interoperability with global TDM infrastructure and carrier-grade deployment readiness.
DS21552LN 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)
DS21552LN FAQ
1.How can I place an order for DS21552LN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21552LN 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 DS21552LN reliable?
The price and inventory of DS21552LN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21552LN is usually 5 days.
3.What payment methods are accepted for DS21552LN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21552LN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21552LN?
DS21552LN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21552LN 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 DS21552LN?
For technical support, including DS21552LN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21552LN requirements.
6.How does Aetrix verify that DS21552LN is sourced from the original manufacturer or authorized distributors?
All DS21552LN 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 DS21552LN meets industry standards.
7.What is the process for return or replacement of DS21552LN?
All DS21552LN units undergo pre-shipment inspection (PSI). If there is an issue with DS21552LN, 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 DS21552LN part is unused and in its original packaging.
Return procedure for DS21552LN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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