{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1R21-IQC80-C3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1R21-IQC80-C3","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3","factsUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IQC80-C3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series MCU, LM3S1R21-IQC80-C3, 80MHz, 256KB Flash, 48K x 8 RAM, 100-LQFP, -40 to 85°C.","salesMarkdown":"Texas Instruments has marked the LM3S1R21-IQC80-C3 as Obsolete. ## 80MHz Cortex-M3 with 256KB Flash and 48K RAM On-chip memory includes 256KB of Flash (256K x 8) and 48K x 8 of SRAM. This memory profile suits control applications with moderate firmware footprints and real-time data buffering, such as industrial I/O nodes or motor-control bridges. ## 100-LQFP package and board-fit considerations Housed in a 100-LQFP package with a 14x14 mm body, the LM3S1R21-IQC80-C3 uses a 0.50 mm pitch that demands a 4-layer PCB for reliable fan-out of the inner rows. The device provides 67 general-purpose I/O lines and a rich peripheral set including EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART interfaces. On-chip analog conversion comes from an 8-channel 10-bit ADC. Additional integrated blocks include brown-out detect/reset, DMA, POR, PWM, and a watchdog timer, which together reduce external component count in a control board. ## Supply voltage range and power rail design The core and I/O operate from a supply range of 1.08V to 3.6V. This wide Vcc/Vdd window allows the MCU to be powered from a 3.3V rail common in industrial control systems, or from a lower-voltage rail to reduce dynamic power in battery-backed applications.","metaTitle":"LM3S1R21-IQC80-C3 Texas Instruments ARM Cortex-M3 MCU, 80MHz","metaDescription":"Texas Instruments LM3S1R21-IQC80-C3 Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 48K RAM, 100-LQFP. Obsolete — sourced to order against RFQ.","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 1000","Package":"Tray","RAM Size":"48K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"67","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S1R21","Program Memory Size":"256KB (256K 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 ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/680b67575fde816bac5358fa43a3c9cf.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IQC80-C3/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the LM3S1R21-IQC80-C3 and check stock?","answer":"Submit an RFQ for lot-specific quantities and pricing."},{"question":"What is the closest pin-compatible alternative to the LM3S1R21-IQC80-C3?","answer":"A functional replacement would require a different package and pinout, necessitating a PCB redesign. Confirm the BOM position and pin compatibility with the original design before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:49:27.519Z","lastPublished":"2026-07-21T02:49:27.519Z","indexable":true}}