What the LM3S5C36-IQR80-A2T is and where it fits
The Texas Instruments LM3S5C36-IQR80-A2T is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris series, running at 80 MHz. It packs 512 KB of Flash program memory and 64 KB of RAM, with CAN, USB, and an 8-channel 12-bit ADC. The 64-pin LQFP package is rated for -40 to 85°C.
80 MHz Cortex-M3 — what it means for your control loop
The 80 MHz core runs a PID loop at several kHz alongside CAN message handling and USB device stack.
512 KB Flash and 64 KB RAM — sizing the firmware
The 512 KB Flash can hold a full bootloader, RTOS kernel, and a moderate application with CANopen or USB CDC class drivers. The 64 KB RAM is adequate for a few kilobytes of stack and data buffers; if your design requires large frame buffers or extensive data logging, you will need external SRAM or a part with larger on-chip RAM.
Obsolete — sourcing reality
Texas Instruments has marked the LM3S5C36-IQR80-A2T as obsolete. No official successor part number is listed. For new designs, look at TI's current Tiva C Series or other Cortex-M4 parts. For existing BOM lines, this part is available through independent distribution — sourced and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time.