The LM3S5B91-IBZ80-C1: This core speed, combined with a single-cycle multiply and hardware divide, delivers deterministic interrupt response suitable for real-time control loops in motor drives and industrial automation. The flash supports 100,000 write/erase cycles per sector, enabling field firmware updates over the product lifetime without external EEPROM for parameter storage.
Peripheral set and connectivity options
The device integrates a 16-channel, 10-bit analog-to-digital converter, along with PWM outputs, a quadrature encoder interface (QEI), and multiple serial interfaces: CAN, I²C, SPI, SSI, UART/USART, and USB OTG. This peripheral mix suits applications requiring both fieldbus communication and motor position feedback. 72 general-purpose I/O pins are available, many with programmable pull-up/pull-down and drive strength control.
Package, supply, and temperature grade
Housed in a 108-ball LFBGA package (10x10 mm body), the device requires a 4-layer or more PCB for fan-out of the fine-pitch BGA. The BGA package's MSL (Moisture Sensitivity Level) should be verified from the latest TI datasheet for proper bake and reflow profiles.
Obsolete lifecycle — sourcing through independent channels
Texas Instruments has classified the LM3S5B91-IBZ80-C1 as obsolete. The Stellaris family was acquired by TI and later phased out; no direct drop-in alternative exists from the original manufacturer. Quantities are lot-specific and confirmed at RFQ. Buyers should verify date codes and request inspection documentation (X-ray, decapsulation, electrical test) to mitigate counterfeit risk, as no factory warranty applies through non-authorized sources.