SCANSTA111SM

Specialized Overview

The SCANSTA111SM is an enhanced scan bridge multidrop addressable component supporting IEEE 1149.1 (JTAG) protocols, manufactured by Texas Instruments. It operates within a supply voltage range of 3.0 V to 3.6 V and draws a typical operating current of 1.65 mA. The device supports a minimum operating temperature of -40°C and a maximum of +85°C. It is housed in an nFBGA-49 package designed for surface mount technology (SMD/SMT). Key internal features include a 32-bit TCK counter and a 16-bit LFSR signature compactor. The component provides three configurable local scan ports and supports up to 121 unique addresses across seven slot inputs.

Specialized Feature Summary

• Supports hierarchical and multidrop addressable capabilities with up to 121 unique addresses via seven slot inputs.
• Provides three IEEE 1149.1-compatible configurable local scan ports that can be bypassed, selected individually, or combined serially.
• Enables transparent mode to buffer backplane JTAG pins to local scan ports through a single instruction.
• Includes general-purpose local port pass-through bits for FPGA programming write pulses or device status monitoring.

Specialized Applications

• Multidrop test bus environments requiring improved test throughput over single serial scan chains.
• Systems where board removal must retain test access to remaining modules.
• Applications requiring live insertion or withdrawal of boards while maintaining boundary scan integrity.

Specialized Procurement Notes

Verify the specific suffix of the part number before ordering, as variations such as NOPB indicate lead-free compliance. Confirm the lifecycle status, as certain variants like SCANSTA111SMX are marked as Not Recommended for New Designs (NRND). Ensure compatibility with the target system's voltage levels and temperature ranges. Check for moisture sensitivity labels if storage conditions exceed specified limits. Validate that the required address count fits within the supported 121-address limit.

Specialized Selection Notes

Select this component when a multidrop JTAG architecture is required to isolate test access during board maintenance. It is suitable for designs needing configurable local scan rings with tri-state notification outputs. Consider the nFBGA-49 package constraints for PCB layout. Verify that the 3.0 V to 3.6 V supply range aligns with the system power rails. Ensure the design utilizes the seven slot inputs for address configuration rather than fixed pin settings.

Specialized Part Context

The SCANSTA111 belongs to the SCANSTA111 family of interface ICs from Texas Instruments. It extends the standard IEEE 1149.1 test bus into a multidrop environment. This allows multiple devices to share the test bus while maintaining individual addressability. The component facilitates efficient testing in complex systems by enabling parallel access to different scan chains.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Note that the SCANSTA111SMX variant is listed as Not Recommended for New Designs (NRND). Designers should verify if newer generations or alternative TI boundary scan controllers meet the multidrop requirements without relying on unverified cross-references.