The core supply is 1.235 V to 1.365 V.
80 MHz Cortex-M3 — what the speed means for the BOM
80 MHz on the Cortex-M3 core. The 384 KB Flash and 96 KB RAM support a moderate firmware image with TCP/IP stack and application logic.
Obsolete — sourcing and lifecycle reality
Texas Instruments has marked the LM3S9U96-IBZ80-A1 as obsolete. For new designs, evaluate the TM4C129x series (same Cortex-M4F core, pin-incompatible but software-migratable) or a third-party ARM MCU with Ethernet and USB OTG.
