{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5791-IQC80-C5","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5791-IQC80-C5","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5791-IQC80-C5","factsUrl":"https://icboms.com/api/mcp/products/LM3S5791-IQC80-C5","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 5000 series microcontroller, LM3S5791-IQC80-C5, 32-bit single-core ARM Cortex-M3, 80MHz, 128KB Flash, 64KB RAM, 100-LQFP, -40°C to 85°C.","salesMarkdown":"Texas Instruments has marked the LM3S5791-IQC80-C5 as Obsolete. For existing BOM lines, this part is sourced through independent distribution channels — quantities and pricing are confirmed per RFQ against available surplus or new-old-stock inventory. ## ARM Cortex-M3 core at 80 MHz Built around the ARM Cortex-M3 core, the LM3S5791-IQC80-C5 runs at 80 MHz — a 32-bit single-core architecture that delivers deterministic interrupt handling and a Thumb-2 instruction set for code density. The 80 MHz ceiling sets the throughput for control loops and protocol processing; the actual sustained performance depends on flash wait-state configuration and the peripheral bus load. ## On-chip memory and peripheral set Program memory is 128 KB of on-chip Flash, paired with 64 KB of SRAM — enough for a moderate application stack, a real-time operating system kernel, and communication buffers without external memory. The part integrates a 16-channel 10-bit ADC, a DMA controller, PWM modules, a watchdog timer, and brown-out detect/reset. Connectivity spans CAN, USB OTG, multiple UART/USART, SPI, I²C, IrDA, LIN, and a QEI for quadrature encoder inputs. The 72 general-purpose I/O lines are multiplexed with these peripherals. ## Package and temperature grade Housed in a 100-pin LQFP with a 14x14 mm body, surface-mount. The internal oscillator reduces external BOM count for clock generation.","metaTitle":"TI LM3S5791-IQC80-C5 ARM Cortex-M3 MCU, 80MHz, 128KB Flash","metaDescription":"Texas Instruments LM3S5791-IQC80-C5 Stellaris ARM Cortex-M3 MCU, 80MHz, 128KB Flash, 64KB RAM, 100-LQFP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"80MHz","Series":"Stellaris® ARM® Cortex®-M3S 5000","Package":"Tray","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT","Connectivity":"CANbus, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"72","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 16x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S5791","Program Memory Size":"128KB (128K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"1.08V ~ 1.32V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/603e2ee396c884705197257f18e9e4d3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5791-IQC80-C5/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the LM3S5791-IQC80-C5 and get a price?","answer":"No stock-holding claim is made here."},{"question":"What is the closest pin-compatible alternative to the LM3S5791-IQC80-C5?","answer":"The Stellaris family shares a common ARM Cortex-M3 core and peripheral architecture, but pin compatibility varies by package and feature set. A parametric search across the LM3S579x base part number is the starting point for a functional replacement — expect a board-level review of the power rails, oscillator, and peripheral pin mapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5791-IQC80-C5","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S5791-IQC80-C5 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:54:29.295Z","lastPublished":"2026-07-21T02:54:29.295Z","indexable":true}}