What this part is and where it fits
The Texas Instruments LM3S6965-EQC50-A2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris ARM Cortex-M3S 6000 series, clocked at 50 MHz. It packs 256 KB of Flash program memory and 64 KB of RAM, with an integrated Ethernet MAC and PHY plus a full set of serial interfaces.
50 MHz core — what it buys you
The 50 MHz Cortex-M3 core runs a lightweight TCP/IP stack and a control loop. The internal oscillator saves a crystal on the BOM.
Memory sizing for the application
256 KB of Flash and 64 KB of RAM place this part in the mid-range of the Stellaris family. The Flash holds a full Ethernet stack plus application code; the RAM handles packet buffers and a modest data set. If your design needs more than 64 KB of working memory for large frame buffers or extensive look-up tables, you'll want to step up to a part with external memory interface — this one doesn't have one.
Industrial temperature grade and peripherals
Rated for -40°C to 105°C, this MCU is comfortable in a motor drive cabinet or an outdoor telecom enclosure. The brown-out detect and POR ensure reliable startup in noisy industrial environments. The PWM and QEI peripherals are ready for motor control with quadrature encoder feedback. The watchdog timer is there for safety-critical loops — don't leave it disabled in production.
Lifecycle and sourcing reality
The LM3S6965-EQC50-A2 is listed with an end-of-life (EOL) hot status. TI has transitioned the Stellaris line to the Tiva-C series. For existing BOMs, we source this part through independent distribution channels, quoted to order against an RFQ.