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Texas Instruments LM3S5791-IQC80-C1 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5791-IQC80-C1 Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5791-IQC80-C1
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5791-IQC80-C1, 32-bit MCU, 80MHz, 128KB Flash, 64KB RAM, 72 I/O, CAN/USB OTG/Ethernet, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S5791-IQC80-C1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-IQC80-C1 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
PackageTray
RAM size64K 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
Case100-LQFP
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M3 with industrial connectivity

The LM3S5791-IQC80-C1: It carries a rich peripheral set including CAN, USB OTG, Ethernet, multiple UART/SPI/I²C interfaces, and a 16-channel 10-bit ADC — all in a 100-pin LQFP package.

Obsolete — plan for last-time buy or replacement

The LM3S5791-IQC80-C1 lifecycle status is Obsolete.

Memory and peripheral fit for control applications

The 72 general-purpose I/O pins and the EBI/EMI interface allow direct connection to external memory or parallel peripherals without a glue-logic CPLD. The internal oscillator reduces BOM count, though an external crystal may be preferred for CAN or USB timing accuracy.

Supply rail and package notes

Core supply is 1.08 V to 1.32 V — a dedicated rail is required, separate from the I/O supply. The part is surface-mount only, tray shipping.

Frequently asked questions

What is the programming interface for LM3S5791-IQC80-C1?

The LM3S5791 supports standard ARM Serial Wire Debug (SWD) and JTAG interfaces for programming and debugging. The SWD interface uses two pins (SWDIO and SWCLK) and stays alive even with the watchdog enabled.

Can I use LM3S5791-IQC80-C1 in new designs?

Not recommended. Since the part is Obsolete, new designs should target an active replacement. The 80 MHz Cortex-M3 class with CAN, USB OTG, and Ethernet is well-served by current-generation MCUs from multiple vendors.