Skip to main content
Texas Instruments LM3S1R21-IBZ80-C5 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S1R21-IBZ80-C5 Stellaris ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash

MPNLM3S1R21-IBZ80-C5
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 1000 series LM3S1R21-IBZ80-C5, 32-bit MCU, 80 MHz, 256 KB Flash, 48 KB RAM, 67 I/O, 108-BGA, -40 to 85°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S1R21-IBZ80-C5 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 1000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTray
RAM size48K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityEBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART
Number of i (O)67
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 8x10b
Program memory size256KB (256K x 8)

Product details

What this part is and where it fits

The LM3S1R21-IBZ80-C5 is a 32-bit ARM Cortex-M3 MCU from TI's Stellaris series, running at 80 MHz with 256 KB of Flash and 48 KB of RAM. It carries 67 general-purpose I/O lines and a broad connectivity set that includes EBI/EMI, I²C, SPI, UART, IrDA, LIN, and Microwire.

Obsolete — sourcing reality

Frequently asked questions

What is LM3S1R21-IBZ80-C5's listed speed?

The core runs at 80 MHz.

What series is LM3S1R21-IBZ80-C5 from?

It belongs to the Stellaris ARM Cortex-M3S 1000 series from Texas Instruments.