{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1R21-IBZ80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1R21-IBZ80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1R21-IBZ80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IBZ80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series, LM3S1R21-IBZ80-C3T, 32-bit single-core MCU, 80MHz, 256KB Flash, 48KB RAM, 67 I/O, 108-LFBGA, -40°C to 85°C, Tape & Reel.","salesMarkdown":"## 80 MHz Cortex-M3 with 256 KB Flash — what the memory ratio means for firmware fit The LM3S1R21-IBZ80-C3T runs an ARM Cortex-M3 core at 80 MHz, with 256 KB of Flash and 48 KB of SRAM on-chip. That 5.3:1 Flash-to-RAM ratio is typical for a control-oriented MCU — the firmware image, including a real-time operating system kernel and communication stacks (TCP/IP, USB, CAN), fits in the Flash, while the SRAM handles the stack and data buffers without external memory. Texas Instruments has marked the LM3S1R21-IBZ80-C3T as Obsolete. For a BOM line that already carries this order code, the sourcing posture is quoted-to-order against the required volume. With 67 general-purpose I/O and a peripheral set that includes EBI/EMI, I²C, SPI, SSI, UART/USART, IrDA, LINbus, and Microwire, this MCU can interface directly with parallel LCDs, serial sensors, motor encoder interfaces, and LIN-based automotive subnets without a port expander or protocol translator. The 8-channel 10-bit ADC samples analog inputs for current sensing or temperature monitoring on the same die. ## Package — 108-ball BGA layout constraints Supplied in a 108-LFBGA with a 10x10 mm body and 0.80 mm ball pitch. The tight pitch demands at least a 4-layer PCB for fan-out of the inner balls to via-in-pad or dog-bone traces.","metaTitle":"Texas Instruments LM3S1R21-IBZ80-C3T ARM Cortex-M3 MCU","metaDescription":"Texas Instruments LM3S1R21-IBZ80-C3T Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 48KB RAM, 67 I/O, 108-BGA.","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":"Tape & Reel (TR)","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":"108-LFBGA","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":"108-BGA (10x10)","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-IBZ80-C3T/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum clock speed and memory configuration of LM3S1R21-IBZ80-C3T?","answer":"The Cortex-M3 core runs at 80 MHz. On-chip memory is 256 KB of Flash and 48 KB of SRAM."},{"question":"What interface protocols does this MCU support?","answer":"The connectivity block includes EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART — enough to handle parallel displays, serial sensors, LIN automotive networks, and legacy Microwire peripherals without external protocol conversion."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1R21-IBZ80-C3T","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-IBZ80-C3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:49:28.964Z","lastPublished":"2026-07-21T02:49:28.964Z","indexable":true}}