Obsolete — spot-market sourcing only
Texas Instruments has marked the LM3S1B21-IBZ80-C5 as obsolete. Availability and pricing confirmed per lot at quote time; date codes and quantities vary.
80 MHz Cortex-M3 with 256 KB flash
The ARM Cortex-M3 core runs at 80 MHz — the 32-bit single-core architecture delivers 1.25 DMIPS/MHz, putting throughput around 100 DMIPS assuming zero-wait flash access. On-chip memory: 256 KB flash for program storage and 96 KB SRAM for data. The flash is large enough for a full protocol stack plus application code; the 96 KB RAM leaves headroom for packet buffers in Ethernet or EBI/EMI applications.
108-ball BGA — 10x10 mm footprint
Packaged in a 108-LFBGA, supplier device package 108-BGA 10x10 mm. The 0.80 mm ball pitch demands a multi-layer PCB for fan-out — a 4-layer board is typical for this density. 67 general-purpose I/O lines bring out the peripheral mix: EBI/EMI for external memory or parallel displays, plus I²C, SPI, SSI, UART, IrDA, LIN, and Microwire serial interfaces.