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Texas Instruments LM3S5791-IQC80-C0 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5791-IQC80-C0 ARM Cortex-M3 MCU, 80 MHz, 128 KB Flash

MPNLM3S5791-IQC80-C0
Obsolete

Texas Instruments Stellaris LM3S5791-IQC80-C0, ARM Cortex-M3 32-bit MCU, 80 MHz, 128 KB Flash, 64 KB SRAM, USB OTG, dual CAN, LIN, 16x10b ADC, 72 I/O, 100-LQFP, 1.08–1.32 V, -40°C to 85°C, Tray.

Texas Instruments LM3S5791-IQC80-C0 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-IQC80-C0 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-C0: The 16-channel 10-bit ADC and quadrature encoder interface (QEI) suit motor-drive feedback and sensor acquisition.

The 80 MHz core delivers roughly 1.25 DMIPS/MHz, giving about 100 DMIPS of headroom for control loops, protocol stacks, and real-time tasks. Combined with the 64 KB SRAM, this part can handle a moderate RTOS, a TCP/IP stack over Ethernet (via external PHY on the EBI/EMI), and dual CAN channels without running out of memory.

This part carries an official obsolete status. For a production BOM that already qualifies this MCU, the only viable channel is the independent distribution market — surplus, new-old-stock, or broker inventory. If you are designing a new board, you will want to evaluate a current-production ARM Cortex-M3 or Cortex-M4 part with similar peripheral mapping.

The LM3S5791-IQC80-C0 is supplied in a 100-pin LQFP with a 14x14 mm body (0.5 mm pitch). It is a surface-mount package, tray shipping. The footprint is a standard JEDEC 100-LQFP; no exotic pad geometry.

Frequently asked questions

What is the replacement for LM3S5791-IQC80-C0?

No direct pin-compatible replacement is listed under the LM3S5791 base number. For new designs, evaluate a current-production ARM Cortex-M3 or Cortex-M4 MCU from TI's Tiva C Series or a comparable vendor with similar peripheral set (USB OTG, dual CAN, LIN, 10-bit ADC).

What is LM3S5791-IQC80-C0's listed speed?

The core is rated at 80 MHz. That is the maximum clock frequency for the ARM Cortex-M3 in this device.