80 MHz Cortex-M3 with industrial connectivity — what it was built for
The LM3S9997-IQC80-C3: It was designed for industrial control and networking applications that require both real-time processing and multiple communication protocols on a single chip. The DMA engine offloads data movement from the core, preserving throughput for protocol stacks.
The LM3S9997-IQC80-C3 has an Obsolete lifecycle status. No minimum commitment is required for a single BOM line, but the supply is finite — once the surplus inventory is consumed, no further production exists. If you are evaluating a new design, do not qualify this part. The 100-LQFP footprint and the 1.235 V to 1.365 V core supply rail are specific enough that a drop-in replacement does not exist in the current TI portfolio.
Package and temperature — board-fit checklist
The core supply requires a regulated 1.235 V to 1.365 V rail.