DS26401A2

Telecom Overview

The DS26401A2 is an octal T1/E1/J1 framer manufactured by Analog Devices Inc./Maxim Integrated. It integrates eight independent software-selectable framing channels and a system interface within a single package. The device operates on a 3.3V single supply, tolerating 5V inputs, and supports bus rates from 1.544MHz to 16.384MHz. It utilizes a 256-pin BGA package measuring 17mm x 17mm with 1.00mm pitch. The component functions as a telecom interface IC, featuring flexible TDM backplane support and internal clock adaptation for synchronous high-frequency timing generation.

Telecom Feature Summary

• Integrates eight independent, fully functional T1/E1/J1 framers/formatters with separate transmit and receive paths.
• Includes dedicated HDLC controllers per channel, mappable to any DS0 or FDL/Sa bit position.
• Supports multiple line coding standards including AMI, B8ZS, HDB3, and NRZ with flexible signaling extraction and insertion.
• Features an integrated Bit Error Rate Test (BERT) device usable across all ports and elastic buffering for each transmitter and receiver.

Telecom Applications

• Add/Drop Multiplexers
• Central Office Equipment
• DSLAM Backplanes
• Interface Card Assemblies
• Wide Area Network Interfaces

Telecom Procurement Notes

Verify current availability status as the DS26401A2 is listed as obsolete in official distributor records. Confirm end-of-life timelines and last-time-buy windows directly with Analog Devices or authorized partners. Ensure compliance with RoHS directives if applicable to legacy stock. Validate pin compatibility and thermal requirements before integrating discontinued components into new designs.

Telecom Selection Notes

Select this component for applications requiring high-density T1/E1/J1 framing in a compact form factor. The 256-pin BGA package necessitates careful PCB layout and thermal management considerations. Verify that the host system supports the required 8-bit parallel control interface modes. Ensure the design accommodates the specific voltage tolerances and operating temperature range defined in the datasheet.

Telecom Part Context

The DS26401A2 belongs to the DS26401 series of octal framers produced by Maxim Integrated, now part of Analog Devices. This series was designed to consolidate multiple framing functions into a single chip, reducing board space and power consumption compared to discrete solutions. The A2 suffix typically denotes specific manufacturing revisions or packaging variations within the broader DS26401 family.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, direct pin-to-pin replacements may not exist. Engineers should evaluate newer generations of framing ICs from Analog Devices or other manufacturers, ensuring functional equivalence for T1/E1/J1 protocols and interface compatibility.