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Analog Devices Inc./Maxim Integrated DS26504LN+
- Part No.:
- DS26504LN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 64-LQFP
- Datasheet:
-
DS26504LN+.pdf
- Description:
- IC TELECOM INTERFACE 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,594
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Product details
Overview
DS26504LN+ 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 with 5V-tolerant I/O, -40°C to +85°C operating range, and 64-pin LQFP package. It recovers clock and SSM from T1 (1.544MHz), E1 (2.048MHz), 64kHz composite clock, and 6312kHz interfaces while translating between any supported input and output sync rates for telecom timing applications.
For engineers reviewing the DS26504LN+ datasheet, DS26504LN+ pinout, DS26504LN+ application, or DS26504LN+ equivalent, key selection criteria include G.703 compliance across multiple sync interfaces (64kHz Option A/B, 6312kHz, 2048kHz), crystal-less jitter attenuation in T1/E1 modes, hardware-controlled termination (75Ω/100Ω/110Ω/120Ω/133Ω), and support for parallel (Intel/Motorola), SPI, or hardware control ports.
Technical Context
The DS26504LN+ implements fully independent transmit and receive PLLs, enabling simultaneous operation on disparate synchronization sources - e.g., receiving 64kHz composite clock while transmitting synchronized 2.048MHz E1 frames with embedded Sa(n) bit SSM. Its jitter attenuator operates without external crystal, using internal VCOs with programmable loop bandwidths optimized for GR-378 and ITU-T G.703 compliance.
Control is implemented via three coexistent interfaces: 8-bit parallel (multiplexed/nonmultiplexed, Intel/Motorola bus timing), SPI serial port (CPOL/CPHA configurable), and dedicated hardware pins for critical functions like fast transmitter disable and LOS/AIS/LOF assertion. JTAG boundary scan (IEEE 1149.1) supports production test and in-system diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5%; enables direct interface with 3.3V logic while tolerating 5V signals on all I/O pins without level shifters. |
| 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 (Option A/B, Japanese), 6312kHz, 8kHz, 19.44MHz; supports multi-standard BITS timing hierarchy. |
| SSM Recovery & Insertion | T1 BOC SSM (receive change-of-state validation) and E1 Sa(n) bit SSM (receive change-of-state indication); ensures traceable timing quality in hierarchical sync networks. |
| Jitter Attenuation | Clock recovery with crystal-less jitter filtering in T1/E1 modes; meets GR-378 composite clock requirements without external crystal or VCXO. |
| Line Interface Termination | Software-selectable 75Ω/100Ω/110Ω/120Ω/133Ω on both TX/RX sides; eliminates need for external resistor networks and supports diverse line build-out configurations. |
| Control Interfaces | 8-bit parallel (Intel/Motorola timing), SPI (CPOL/CPHA configurable), and hardware mode; provides flexibility for MCU, FPGA, or standalone controller integration. |
Pinout & Package
DS26504LN+ 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 status outputs | Dedicated open-drain pins asserting loss-of-signal, alarm-indication-signal, and loss-of-frame conditions without software polling. |
| TXDIS | Transmit disable control | Active-low hardware pin enabling sub-microsecond transmitter shutdown for protection switching in redundant line systems. |
| MCLK | Master clock input | Accepts 1.544MHz, 2.048MHz, 4.096MHz, 8.192MHz, 12.8MHz, or 16.384MHz; determines frame rate and PLL reference for T1/E1/J1 operation. |
| TS_8K_4 | 8kHz/400Hz composite clock output | Provides synchronized 8kHz framing clock or 400Hz maintenance signal in 64kHz composite clock mode per GR-378. |
| RLOF_CCE | Receive LOF/CRC error indicator | Combines loss-of-frame detection and CRC error flag into single hardware output for simplified monitoring in bridging applications. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates external crystal requirement for T1/E1 clock recovery while meeting GR-378 jitter tolerance and attenuation specs. |
| Monitor mode for bridging | Enables non-intrusive line monitoring by routing received data to internal registers without disrupting transmit path - critical for network visibility applications. |
| G.703-compliant interfaces | Fully satisfies G.703 2048kHz, 64kHz Option A/B, Japanese composite clock, and 6312kHz sync interface requirements - no design waivers needed. |
| Independent TX/RX functionality | Allows asynchronous operation: e.g., receive 64kHz composite clock while transmitting E1 with embedded Sa(n) SSM, enabling flexible BITS node architectures. |
| Software-selectable termination | On-chip resistive termination eliminates external components and supports field reconfiguration for 75Ω coaxial or 100–133Ω twisted-pair line interfaces. |
Applications
| Central Office BITS Node | Remote Terminal Timing Hub |
|---|---|
|
Use Scenario: Primary timing source in Class 1 or Class 2 BITS node synchronizing multiple T1/E1 line cards and digital cross-connect systems. IC Role / Device Role / Timing Role: Clock recovery and rate translation element sourcing stable 2.048MHz, 1.544MHz, and 64kHz outputs from higher-tier sync inputs. Use Value: Meets GR-378 composite clock spec with <±0.01 ppm accuracy and <1.5UI peak-to-peak jitter, ensuring traceable stratum-level timing distribution. |
Use Scenario: Timing consolidation point in DSLAM or fiber access node aggregating sync from upstream BITS and distributing to downstream E1/T1 backhaul links. IC Role / Device Role / Timing Role: SSM-aware transceiver converting 6312kHz Japanese sync input to local E1 payloads with Sa(n) bit insertion and validation. Use Value: Enables interoperability with legacy Japanese telecom infrastructure while maintaining SSM integrity across sync domains. |
| Redundant Protection Switching System | Multi-Standard Test Equipment |
|
Use Scenario: Dual-homed line interface in SONET/SDH add-drop multiplexer requiring fast (<10µs) transmitter disable during protection switchover. IC Role / Device Role / Timing Role: Hardware-controlled T1/E1 transceiver with dedicated TXDIS pin and independent TX/RX clocks. Use Value: Sub-microsecond hardware TXDIS response prevents bit errors during hitless switchovers - verified per Telcordia GR-499-CORE. |
Use Scenario: Programmable sync generator/analyzer in lab equipment validating T1/E1 framer compliance, SSM behavior, and jitter tolerance. IC Role / Device Role / Timing Role: Reconfigurable timing element supporting all major telecom sync standards via SPI or parallel interface. Use Value: Single-device coverage of T1, E1, J1, 64KCC, and 6312kHz interfaces reduces test system complexity and calibration overhead. |
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+ | Single-path architecture (RX-only or TX-only per configuration); lacks independent dual-path operation and monitor mode. | Lower-cost option for fixed-role nodes where full DS26504LN+ feature set is unnecessary. | Select DS26502LN+ only when rate conversion and simultaneous RX/TX operation are not required. |
| DS26503LN+ | Supports identical interfaces and SSM handling but omits 6312kHz sync capability and 64kHz Japanese composite clock compliance. | Suitable for North American and generic E1 deployments excluding Japanese telecom requirements. | Choose DS26503LN+ if 6312kHz and Japanese 64kHz compliance are not mandated in target deployment. |
Compared with DS26502LN+ and DS26503LN+, the DS26504LN+ uniquely delivers full dual-path independence, monitor mode, 6312kHz support, and Japanese 64kHz compliance - making it the only option for multi-region BITS nodes requiring full GR-378 and G.703 conformance.
Availability
DS26504LN+ is available at Aetrix Electronics and suitable for central office timing systems, remote terminal synchronization hubs, redundant protection switching infrastructure, and multi-standard telecom test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DS26504LN+ 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 automotive markets.
The DS26504LN+ belongs to Maxim's telecom timing portfolio, engineered specifically for BITS applications requiring multi-standard synchronization, SSM-aware framing, and carrier-grade jitter performance in harsh environments.
FAQ
What telecom standards does the DS26504LN+ comply with?
The DS26504LN+ complies with ITU-T G.703 for 2048kHz, 64kHz Option A/B, Japanese composite clock, and 6312kHz synchronization interfaces, and meets GR-378 composite clock requirements. It also supports T1 (1.544MHz) and E1 (2.048MHz) line rates with full SSM recovery and insertion per industry specifications. These certifications are documented in the official DS26504 datasheet Rev 072308.
Does the DS26504LN+ require an external crystal for jitter attenuation?
No, the DS26504LN+ features a crystal-less jitter attenuator for T1 and E1 modes, using internal VCOs and programmable loop filters to meet GR-378 jitter tolerance and attenuation requirements without external crystal or VCXO. This reduces BOM count and improves reliability in telecom timing applications.
How does the DS26504LN+ handle Synchronization Status Messages (SSM)?
The DS26504LN+ recovers and inserts SSM in both T1 (BOC format) and E1 (Sa(n) bit format) modes. It provides receive message change-of-state detection and validation indication for T1, and change-of-state indication for E1 Sa(n) bits - enabling precise tracking of timing quality across sync hierarchies as defined in G.781 and GR-1244.
What control interfaces does the DS26504LN+ support?
The DS26504LN+ supports three concurrent control interfaces: 8-bit parallel port (with Intel and Motorola timing modes), SPI serial port (with configurable CPOL and CPHA), and hardware control mode using dedicated pins for functions like TXDIS and LOS assertion. All interfaces allow full register access and real-time status monitoring.
Is the DS26504LN+ pin-compatible with other devices in the DS2650x family?
Yes, the DS26504LN+ is pin and software compatible with the DS26502LN+ and DS26503LN+, sharing identical 64-pin LQFP footprint and register map. However, functional differences exist - DS26504LN+ adds monitor mode, 6312kHz support, and Japanese 64kHz compliance not present in the other variants.
DS26504LN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for DS26504LN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26504LN+ 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+ reliable?
The price and inventory of DS26504LN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26504LN+ is usually 5 days.
3.What payment methods are accepted for DS26504LN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26504LN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26504LN+?
DS26504LN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26504LN+ 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+?
For technical support, including DS26504LN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26504LN+ requirements.
6.How does Aetrix verify that DS26504LN+ is sourced from the original manufacturer or authorized distributors?
All DS26504LN+ 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+ meets industry standards.
7.What is the process for return or replacement of DS26504LN+?
All DS26504LN+ units undergo pre-shipment inspection (PSI). If there is an issue with DS26504LN+, 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+ part is unused and in its original packaging.
Return procedure for DS26504LN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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