64-LQFP footprint and board-fit
The LM3S5C36-IQR80-A2 ships in a 64-LQFP package with a 10x10 mm body. The 0.5 mm pitch on the 64-LQFP demands a 4-layer board for clean fan-out of the inner rows — a 2-layer board will struggle to route the supply and ground to the core without adding vias that eat into the keep-out zone.
Memory headroom and peripheral mix
The 80 MHz Cortex-M3 core delivers roughly 100 DMIPS, enough for real-time control loops and protocol parsing without a cache. The connectivity set includes USB, CAN, I²C, SPI, SSI, UART, and IrDA — a single part can bridge a CAN bus to a USB host and log data over UART simultaneously. 33 general-purpose I/O and an 8-channel 12-bit ADC cover sensor interfaces and simple human-machine interaction. The PWM and QEI peripherals suit motor-control feedback loops without an external FPGA.
Texas Instruments has marked the LM3S5C36-IQR80-A2 as obsolete. No official successor or pin-compatible replacement is recorded in the manufacturer's lifecycle data. RoHS compliance is standard for this date code; full compliance documentation is available per request.