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Texas Instruments LM3S5791-IQC80-C3 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5791-IQC80-C3 Stellaris ARM Cortex-M3 MCU, 80MHz, 128KB Flash

MPNLM3S5791-IQC80-C3
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5791-IQC80-C3, 32-Bit Single-Core MCU, 80MHz, 128KB Flash, 64K x 8 RAM, 100-LQFP, -40°C~85°C.

Texas Instruments LM3S5791-IQC80-C3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-IQC80-C3 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

The LM3S5791-IQC80-C3: Stellaris ARM Cortex-M3 MCU clocked at 80 MHz, with 128 KB Flash and 64 KB RAM. Includes CAN, USB OTG, and 16-channel 10-bit ADC. Supply voltage is 1.08 V to 1.32 V.

Obsolete — sourcing reality and what replaces it

This part is marked obsolete. For new designs, consider current Stellaris series from TI. Verify pin-compatibility and supply voltage independently.

What the 80 MHz and 128 KB Flash mean for fit

80 MHz core clock supports real-time control loops. 128 KB Flash holds a moderate application. The 64 KB RAM is generous for a Cortex-M3 of this vintage — it can hold a full USB descriptor table, a CAN message queue, and a few kilobytes of ADC buffer without paging. No external RAM needed for most sensor-fusion or gateway tasks.

Peripherals and connectivity at a glance

Ten bits suit current-sense or temperature monitoring.

Frequently asked questions

What is the replacement for LM3S5791-IQC80-C3?

No official replacement part number is listed in the lifecycle record. For new designs, consider the current Stellaris or TM4C series from TI, but verify pin-compatibility and supply voltage independently — no direct drop-in is documented.

Where can I buy LM3S5791-IQC80-C3 available via RFQ confirmation?

We source the LM3S5791-IQC80-C3 to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at quote time — submit an RFQ for a real-time response.

What is LM3S5791-IQC80-C3's listed speed?

The core runs at 80 MHz. That is the maximum clock for the ARM Cortex-M3 in this device, giving enough throughput for real-time control loops and protocol stacks.

What is the datasheet for LM3S5791-IQC80-C3?

The datasheet is available from Texas Instruments under the base number LM3S5791. It covers the full register map, electrical characteristics, and application notes for the Stellaris 5000 series.