Texas Instruments has marked the LM3S1F11-IQC50-A1T as Obsolete.
Core architecture and memory headroom
This is the Stellaris 1000 series — the first-generation Cortex-M3 line from TI, positioned for control and connectivity applications that need a balance of throughput and peripheral integration. On-chip memory comprises 384KB of flash (384K x 8) and 48KB of SRAM (48K x 8). For a control-loop application, the 48KB RAM leaves room for a moderate stack, a few communication buffers, and the HAL footprint — but a heavy TCP/IP stack or a large frame buffer will push the budget.
The connectivity list is broad: EBI/EMI for external memory or parallel peripherals, plus I²C, SPI, SSI, UART/USART, IrDA, LINbus, and Microwire. On-chip peripherals include a brown-out detect/reset, DMA controller, POR, PWM, and a watchdog timer. The internal oscillator means the part can run without an external crystal in less timing-critical applications — though for USB or CAN, an external clock source is still the safer call.
The core supply range is 1.235V to 1.365V — a tight window that demands a regulated 1.25V or 1.3V rail, not a 1.8V or 3.3V supply directly.
The 0.5 mm pitch LQFP-100 is a standard footprint — four-layer boards are typical for fan-out, though two-layer can work if the inner rows are routed to vias under the body.