Texas Instruments has classified the LM3S1911-EQC50-A2 as obsolete.
Core and memory for the BOM line
On-chip memory includes 256 KB of Flash for program storage and 64 KB of SRAM — the SRAM-to-Flash ratio gives headroom for a moderate application stack plus a real-time OS footprint without external memory.
Peripheral set and package fit
Connectivity options include I²C, SPI, SSI, UART/USART, IrDA, and Microwire — the SSI and SPI lanes handle synchronous serial peripherals like ADCs or display controllers, while the UARTs support debug and fieldbus gateways. 60 general-purpose I/O pins are available. Housed in a 100-LQFP package (14x14 mm body) — the 0.5 mm pitch requires a four-layer PCB for clean fan-out of the outer rows. Supply voltage is 2.25 V to 2.75 V, a single 2.5 V rail. On-chip peripherals include brown-out detect, POR, PWM, and watchdog timer — the brown-out reset protects Flash integrity during a supply dip, and the PWM module drives motor-control or LED-dimming outputs without a dedicated timer peripheral.