JTAG Multiplexer/Switch

Fully MicroTCA™-Compliant JTAG Multiplexer/Switch
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Status Explanations for product status codes

Active: In Production.


The DS26900 is a JTAG signal multiplexer providing connectivity between one of three master ports and up to 18 (36 in cascade configuration) secondary ports. The device is fully configurable from any one of the three master ports. The DS26900 can automatically detect the presence JTAG devices on the secondary ports.

The DS26900 can be used in multiple configurations including as a single device, two cascaded devices, or two redundant devices.

All device control and configuration is accomplished through standard JTAG operations via the selected master port.

Data Sheet

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Key Features

  • Efficient Solution for Star Architecture JTAG
  • Provides Transparent Communications Between the Arbitrated Master and a Selected Secondary Port
  • Single-Package Solution Provides 18 Secondary Ports
  • Two-Package Cascade Configuration Provides 36 Secondary Ports
  • Three Arbitrated Master Ports
  • Autodetection of Port Presence
  • Internal Pullup/Down Resistors
  • Two 32-Bit Scratchpad Registers
  • Four GPIO Pins for Read/Write Control and Signaling Applications
  • Operation Up to 50MHz
  • Signal Path Modification Options
  • Redundancy with High-Impedance Pin
  • Independent Periphery JTAG
  • Configuration Mode Uses IEEE 1149.1 TAP Controller
  • Supports Live Insertion/Withdrawal
  • 3.3V Operation
  • Industrial Temperature Operation
  • RoHS-Compliant Packaging


  • AMC Carrier Cards
  • ATCA® Chassis
  • JSM Modules
  • MicroTCA™ Chassis
  • System Level JTAG

Key Specifications:

T/E Carrier & Packetized Products
Part Number Functions Budgetary
See Notes
DS26900  JTAG Switch $8.26 @1k
See All T/E Carrier & Packetized Products (88)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS26900: Functional Diagram
Functional Diagram

More Information

New Product Press Release   2007-10-17 ]

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Information Index

Document Ref.: 19-5747 Rev 1; 2011-02-17
This page last modified: 2011-02-17