Stellaris Cortex-M3 at 50 MHz — what it does
The LM3S2276-IQR50-A0: 32-bit ARM Cortex-M3 MCU from the Stellaris® series, clocked at 50 MHz with 64 KB of Flash and 32 KB of RAM. Includes CAN, I²C, SPI, UART, six 10-bit ADC channels, PWM, DMA, and a brown-out detector.
Obsolete — what that means for your BOM line
50 MHz, 64 KB Flash, 32 KB RAM — fit check
The 50 MHz core is enough for a control loop running at a few kilohertz with a CAN message stack and a UART debug channel. The 64 KB Flash holds a moderate firmware image — think bootloader plus application code for a motor drive or a remote I/O node. The 32 KB RAM gives headroom for a couple of CAN message buffers and a small data log. If your application needs more than that, you are looking at a different density tier in the Stellaris family or a migration to a newer Cortex-M4 part.
Industrial temperature grade
Rated for -40°C to 85°C ambient, this MCU is at home in factory-floor enclosures, outdoor telecom cabinets, and engine-bay-adjacent electronics that see temperature swings. The 2.25 V to 2.75 V supply rail is tight — your regulator must hold within that band, especially under load transients.