DS26900LN+

Analog Switches - Special Purpose Overview

The DS26900LN+ is a JTAG multiplexer and switch manufactured by Analog Devices Inc./Maxim Integrated. It provides connectivity between three master ports and up to eighteen secondary ports, or thirty-six in a cascade configuration. The device operates at 3.3V with an industrial temperature range of -40°C to +85°C. It supports operation frequencies up to 50MHz and features automatic detection of secondary port presence. Control and configuration are performed via standard JTAG operations through the selected master port.

Analog Switches - Special Purpose Feature Summary

• Provides transparent communication between an arbitrated master and a selected secondary port
• Features internal pullup/pulldown resistors and two 32-bit scratchpad registers
• Supports live insertion and withdrawal of secondary devices
• Includes independent periphery JTAG interface for board-level testing

Analog Switches - Special Purpose Applications

• MicroTCA Chassis systems
• ATCA Chassis systems
• AMC Carrier Cards
• JSM Modules

Analog Switches - Special Purpose Procurement Notes

Verify that the component matches the specific DS26900LN+ designation, which indicates a lead-free/RoHS-compliant package in a 144-pin LQFP format. Confirm the operating temperature range aligns with industrial requirements (-40°C to +85°C). Ensure the supply voltage is stable at 3.3V ±5% for proper functionality.

Analog Switches - Special Purpose Selection Notes

Select this component when a single-package solution for up to eighteen secondary JTAG ports is required. Consider the cascade configuration if thirty-six secondary ports are needed. Verify compatibility with 3.3V logic levels and ensure the system architecture supports the necessary master arbitration protocols defined by the IEEE 1149.1 standard.

Analog Switches - Special Purpose Part Context

This part belongs to the Maxim Integrated JTAG Multiplexer/Switch family. It is designed to simplify star architecture JTAG connections in complex embedded systems. The device integrates a Switch TAP Controller and a Periphery TAP Controller to manage test access and configuration efficiently within high-density electronic assemblies.

Analog Switches - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult official manufacturer resources for cross-reference information regarding equivalent JTAG multiplexers.