What this MCU packs — and where it fits
The LM3S9792-IBZ80-C5T: It carries 128 KB of program Flash and 64 KB of SRAM, enough for a moderate protocol stack and application code, with a 10-bit ADC scanning 16 external channels. The 65 GPIOs break out through a 108-ball BGA (10x10 mm), and the internal oscillator cuts the external BOM count.
Official lifecycle status is Obsolete. There is no manufacturer last-time-buy window still open, and no successor part number is published in the product change notice history for this code. Every lot should be date-code traced and cross-checked against the original TI PCN to confirm authenticity.
The 80 MHz core clock delivers integer throughput. The 64 KB SRAM is the practical ceiling for packet buffers and task stacks. The 128 KB Flash holds the firmware image.
108-ball BGA — layout and rework realities
The 108-BGA (10x10 mm) package uses a 0.8 mm ball pitch typical for this density. Four-layer PCB minimum, with the 1.235 V to 1.365 V core rail demanding clean decoupling — place the 1 V output LDO close and use a solid ground plane under the BGA. The 65 GPIOs are distributed around the perimeter balls, so fanout is manageable with microvias on inner layers. For rework, the package is MSL 3; if the moisture-barrier bag has been open longer than the floor-life window, bake at 125°C for 24 hours before reflow. Hot-air rework stations can handle this ball count, but a pre-heater plate is recommended to avoid cold joints on the center balls.