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Analog Devices Inc./Maxim Integrated DS26504LN+T&R
- Part No.:
- DS26504LN+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 64-LQFP
- Datasheet:
-
DS26504LN+T&R.pdf
- Description:
- IC TELECOM INTERFACE 64LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS26504LN+T&R from Maxim Integrated is a T1/E1/J1/64KCC BITS clock-recovery and rate-conversion element with dual independent receive/transmit paths, 3.3V supply, 5V-tolerant I/O, and support for G.703-compliant 64kHz composite clock, 6312kHz, and 8kHz/19.44MHz reference inputs - deployed in telecom central office timing distribution systems.
For engineers reviewing the DS26504LN+T&R datasheet, DS26504LN+T&R pinout, DS26504LN+T&R application, or DS26504LN+T&R equivalent, key selection criteria include SSM message handling (T1 BOC / E1 Sa(n)), software-selectable line termination (75Ω–133Ω), crystal-less jitter attenuation, and hardware controller port flexibility (parallel/SPI/JTAG).
Technical Context
The DS26504LN+T&R implements fully independent transmit and receive PLLs, enabling simultaneous translation between any supported input synchronization rate (T1: 1.544MHz, E1: 2.048MHz, 64kHz, 6312kHz, 8kHz, 19.44MHz) and any supported output rate. It supports both CMI-coded T1/J1 and E1 line interfaces with configurable line build-out and automatic sensitivity adjustment.
SSM recovery and insertion are implemented per GR-378 and ITU-T G.781: T1 uses bit-oriented code (BOC) with change-of-state detection; E1 uses Sa(n) bits in CRC4 multiframe with validation indication. Jitter attenuation operates without external crystal in T1/E1 modes and includes bypass mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - enables direct interface with modern 3.3V logic while maintaining 5V tolerance on all I/O pins for legacy system compatibility. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom infrastructure environments including central office and remote terminal cabinets. |
| Synchronization Inputs | T1 (1.544MHz), E1 (2.048MHz), 64kHz composite clock, 6312kHz, 8kHz, 19.44MHz - supports multi-standard BITS timing hierarchy and legacy network interworking. |
| SSM Support | T1 BOC and E1 Sa(n) message recovery/transmission with change-of-state detection - ensures traceable timing quality and hierarchical synchronization integrity per G.781. |
| Line Termination | Software-selectable 75Ω/100Ω/110Ω/120Ω/133Ω - eliminates external resistor networks and enables dynamic adaptation to varying cable lengths and topologies. |
| Control Interfaces | 8-bit parallel (Intel/Motorola), SPI serial, and hardware control modes - provides flexible integration into FPGA-, MCU-, or ASIC-based management subsystems. |
| JTAG Support | IEEE 1149.1 boundary scan - enables in-system test, debug, and configuration verification without physical probe access. |
Pinout & Package
DS26504LN+T&R is housed in a 64-pin LQFP (10mm × 10mm, 0.5mm pitch) package with exposed thermal pad. Pin functions are defined per Maxim's DS26504 datasheet Rev 072308, Table 5-1 (LQFP Pinout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LOS, AIS, LOF | Hardware alarm outputs | Dedicated open-drain status pins indicating Loss of Signal, Alarm Indication Signal, and Loss of Frame - enable immediate fault response without software polling. |
| TXDIS | Transmit disable control | Fast hardware-controlled transmitter shutdown for protection switching in redundant timing paths. |
| MCLK | Master clock input | Accepts 1.544MHz, 2.048MHz, 4.096MHz, 8.192MHz, 12.8MHz, or 16.384MHz - selects internal PLL operating mode and frame timing basis. |
| TS_8K_4 | 8kHz/4kHz clock output | Provides synchronized low-frequency timing reference for downstream framing or monitoring circuits. |
| RLOF_CCE | Receive LOF/CRC error indicator | Combines Loss of Frame and CRC error detection into single hardware flag for simplified fault isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates external crystal requirement in T1/E1 modes while achieving <1.5UI peak-to-peak jitter at output - reduces BOM count and board space in timing modules. |
| Monitor mode | Enables non-intrusive bridging of T1/E1 lines for real-time signal analysis without disrupting live traffic - critical for diagnostics and compliance testing. |
| G.703 compliance | Fully compliant with G.703 2048kHz, 64kHz Option A/B, Japanese composite clock, and 6312kHz interfaces - ensures interoperability across North American, European, and Japanese telecom infrastructures. |
| GR-378 composite clock | Meets Telcordia GR-378 requirements for stability, holdover, and wander performance - qualifies DS26504LN+T&R for use in primary reference clocks and BITS applications. |
| Pin/software compatibility | Direct replacement for DS26502 and DS26503 - allows reuse of existing PCB layouts and firmware drivers during product upgrades. |
Applications
| Central Office BITS Distribution | T1/E1 Network Edge Timing |
|---|---|
|
Use Scenario: Distributing traceable synchronization across multiple shelves in a Class 1 or Class 2 BITS cabinet. IC Role / Device Role / Timing Role: Primary clock recovery and rate translation node that accepts incoming E1 or 64kHz composite clock and delivers clean T1, E1, and 6312kHz outputs. Use Value: Maintains G.811/G.812 traceability through SSM-aware regeneration and meets GR-378 holdover specs during upstream failure. |
Use Scenario: Providing stratum-3 timing at DSLAM or IP-MSTP edge nodes interfacing legacy TDM and packet networks. IC Role / Device Role / Timing Role: Synchronization gateway converting PTP-derived 8kHz or GNSS-disciplined 19.44MHz references into G.703-compliant T1/E1 outputs. Use Value: Enables hybrid network operation with seamless SSM propagation and jitter attenuation below ITU-T G.823 limits. |
| Redundant Protection Switching System | Multi-Standard Telecom Test Equipment |
|
Use Scenario: Dual-feed timing architecture where DS26504LN+T&R units switch between primary and backup sync sources within 10ms. IC Role / Device Role / Timing Role: Fast-failover timing element using TXDIS pin and hardware LOS/AIS detection to trigger switchover logic. Use Value: Achieves sub-50ms service restoration per GR-435-CORE, avoiding slip events in voice and circuit-emulated services. |
Use Scenario: Embedded timing engine in portable T1/E1 analyzers verifying SSM, jitter, and frame alignment across field deployments. IC Role / Device Role / Timing Role: Programmable sync source and sink supporting all major T1/E1 variants (short/long haul, CMI, B8ZS/AMI) with real-time SSM decode. Use Value: Eliminates need for external pattern generators or reference clocks - enables self-contained conformance testing per G.703 and G.781. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1/E1 BITS timing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26502LN+T&R | Lacks 6312kHz interface support and E1 Sa(n) bit validation; no monitor mode; identical pinout and control interface. | Restricted to T1/E1/64kHz-only systems without Japanese telecom requirements or bridging diagnostics. | Select when cost optimization is prioritized and full DS26504LN+T&R feature set is unnecessary. |
| DS26503LN+T&R | Supports same interfaces but omits 64kHz composite clock compliance and GR-378 certification; retains monitor mode and SSM handling. | Suitable for non-BITS timing applications requiring only T1/E1/8kHz/19.44MHz operation without composite clock hierarchy. | Choose for mid-tier timing nodes where GR-378 compliance is not mandated by network operator policy. |
Compared with DS26502LN+T&R and DS26503LN+T&R, the DS26504LN+T&R uniquely delivers full GR-378-compliant 64kHz composite clock support, 6312kHz interface, and E1 Sa(n) validation - making it the only option qualified for Class 1/2 BITS deployment in global carrier networks.
Availability
DS26504LN+T&R is available at Aetrix Electronics and suitable for central office timing distribution, T1/E1 network edge synchronization, and redundant protection switching systems requiring stable component supply, long-term lifecycle assurance, and full telecom qualification.
Supply support for DS26504LN+T&R 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 high-performance analog and mixed-signal ICs for communications, computing, and industrial applications - with deep expertise in telecom timing, data conversion, and power management.
The DS26504LN+T&R belongs to Maxim's BITS timing family, engineered specifically for carrier-grade synchronization distribution in central offices, wire centers, and mobile backhaul nodes - emphasizing SSM integrity, jitter control, and multi-standard interoperability.
FAQ
What is the operating temperature range for DS26504LN+T&R?
The DS26504LN+T&R is rated for -40°C to +85°C operation, meeting industrial and telecom infrastructure requirements. This extended range ensures reliable performance in uncontrolled environments such as outdoor cabinets, remote terminals, and central office equipment rooms where ambient temperatures fluctuate significantly. The DS26504LN+T&R maintains full specification compliance across this entire range without derating.
Does DS26504LN+T&R support both T1 and E1 Synchronization Status Messages (SSM)?
Yes, DS26504LN+T&R fully supports T1 SSM via bit-oriented code (BOC) with receive message change-of-state detection and validation indication, and E1 SSM via Sa(n) bits in CRC4 multiframe with change-of-state indication. Both are implemented per ITU-T G.781 and GR-378, enabling hierarchical timing traceability and failure isolation in multi-vendor networks.
Can DS26504LN+T&R operate without an external crystal?
Yes, DS26504LN+T&R features a crystal-less jitter attenuator for T1 and E1 modes, eliminating the need for external crystal oscillators. It achieves jitter attenuation using internal PLL architectures and supports bypass mode for direct clock pass-through - reducing component count, board area, and startup time compared to crystal-dependent solutions.
What line interface standards does DS26504LN+T&R comply with?
DS26504LN+T&R complies with ITU-T G.703 for 2048kHz, 64kHz Option A/B, Japanese composite clock, and 6312kHz interfaces; GR-378 for composite clock performance; and G.781 for SSM handling. It also supports CMI-coded T1/J1 and E1 line formats with short- and long-haul configurations - ensuring global interoperability.
Is DS26504LN+T&R pin-compatible with earlier devices in the series?
Yes, DS26504LN+T&R is pin and software compatible with DS26502LN+T&R and DS26503LN+T&R. This allows drop-in replacement in existing designs, preserving PCB layout, firmware, and test infrastructure while upgrading to full GR-378 and 6312kHz support. No hardware or software modifications are required for migration.
DS26504LN+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- BITS Element
- Interface:
- 64KCC, E1, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.14V ~ 3.47V
- Current - Supply:
- 150mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
DS26504LN+T&R FAQ
1.How can I place an order for DS26504LN+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26504LN+T&R 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 DS26504LN+T&R reliable?
The price and inventory of DS26504LN+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26504LN+T&R is usually 5 days.
3.What payment methods are accepted for DS26504LN+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26504LN+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26504LN+T&R?
DS26504LN+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26504LN+T&R 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 DS26504LN+T&R?
For technical support, including DS26504LN+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26504LN+T&R requirements.
6.How does Aetrix verify that DS26504LN+T&R is sourced from the original manufacturer or authorized distributors?
All DS26504LN+T&R 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 DS26504LN+T&R meets industry standards.
7.What is the process for return or replacement of DS26504LN+T&R?
All DS26504LN+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS26504LN+T&R, 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 DS26504LN+T&R part is unused and in its original packaging.
Return procedure for DS26504LN+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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