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Texas Instruments LM3S5B91-IBZ80-C3T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5B91-IBZ80-C3T Stellaris ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash

MPNLM3S5B91-IBZ80-C3T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series 32-bit MCU, LM3S5B91-IBZ80-C3T, 80 MHz core, 256 KB Flash, 96 KB SRAM, 72 I/O, CAN, USB OTG, 108-BGA, -40 to 85°C.

Texas Instruments LM3S5B91-IBZ80-C3T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5B91-IBZ80-C3T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 1.32V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTape & Reel (TR)
RAM size96K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)72
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size256KB (256K x 8)

Product details

At 80 MHz the Cortex-M3 delivers enough throughput to run a real-time control loop (e.g., a field-oriented motor controller) alongside a protocol stack (CANopen, Modbus TCP) without an external co-processor. The 96 KB SRAM leaves headroom for a moderate RTOS heap and a few communication buffers — enough for a multi-axis drive or a small HMI panel, but not for heavy data logging or a full TCP/IP offload.

Connectivity and I/O budget

72 general-purpose I/O pins are available, plus dedicated interfaces for CAN, USB OTG, I²C, SPI, UART, and an external bus (EBI/EMI). The 16-channel 10-bit ADC covers analog feedback.

Frequently asked questions

What is LM3S5B91-IBZ80-C3T's listed speed?

The core runs at 80 MHz, which is the headline performance rating for this Cortex-M3 MCU.

What series does LM3S5B91-IBZ80-C3T belong to?

It is part of the Stellaris® ARM® Cortex®-M3S 5000 series from Texas Instruments.