Texas Instruments has marked the LM3S1G21-IBZ80-A1 as obsolete. For a BOM line already qualified to this Stellaris ARM Cortex-M3S 1000 series device, the last-time-buy window has closed — any available inventory is what remains in the distribution pipeline or on the surplus market.
80 MHz Cortex-M3 — throughput and peripheral fit
The 80 MHz ARM Cortex-M3 core delivers the processing headroom for control-loop, protocol-stack, and moderate data-processing tasks. The 384 KB on-chip flash (384K x 8) and 64 KB SRAM (64K x 8) provide a comfortable memory budget for a real-time operating system, application code, and data buffers without external memory in many designs. The 32-bit single-core architecture, combined with the integrated DMA controller and the peripheral set — which includes EBI/EMI, I²C, SPI, SSI, UART/USART, IrDA, LINbus, and Microwire — makes this part suitable for industrial control, human-machine interfaces, and sensor-gateway applications that require both serial connectivity and parallel bus access to external memory or FPGAs.