{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5B91-IQC80-C1","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5B91-IQC80-C1","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5B91-IQC80-C1","factsUrl":"https://icboms.com/api/mcp/products/LM3S5B91-IQC80-C1","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5B91-IQC80-C1, 32-bit single-core MCU at 80MHz, 256KB Flash, 96KB RAM, 72 GPIO, USB OTG / CAN / LIN / SPI / UART, 100-LQFP tray, -40°C to 85°C, 1.08V to 1.32V supply.","salesMarkdown":"## 80 MHz Cortex-M3 with USB OTG, CAN, and LIN — the peripheral mix for industrial gateways The LM3S5B91-IQC80-C1 is a Stellaris ARM Cortex-M3S 5000 series 32-bit single-core MCU clocked at 80 MHz, built around the ARM Cortex-M3 core. It packs 256 KB of Flash and 96 KB of SRAM, with 72 general-purpose I/Os distributed across a 100-pin LQFP package. ## 256 KB Flash / 96 KB SRAM — what the memory budget buys you 256 KB of Flash gives enough room for a full CANopen or Modbus stack plus a USB device/host firmware image, with headroom for OTA update staging if you partition for a dual-bank scheme. The 96 KB SRAM is notably large for this MCU tier — it can hold several 10-bit ADC scan buffers (the ADC has 16 channels at 10-bit resolution) and a sizable protocol data buffer without needing external SRAM. If your application streams audio over I²S or runs a graphical UI on a small display, that RAM headroom avoids cache-line management gymnastics. For a production BOM that currently uses this part, the only reliable forward channel is the independent distribution market — last-time-buy inventory, surplus stock, and broker-sourced material. Any new design should consider a pin-compatible alternative in the Stellaris family if one exists, or a migration to a current TI Cortex-M4F or M7 part with similar peripheral mapping. ## USB OTG and CAN — connectivity that matters in retrofit and panel applications The USB OTG port lets the MCU act as either a USB host (flash drive, keyboard) or a device (virtual COM port, mass storage class). This is useful for field-upgrade scenarios where a technician plugs in a USB stick with a firmware image. The EBI/EMI interface on the connectivity list means it can also talk to parallel-memory peripherals or external FPGAs over a shared bus.","metaTitle":"Texas Instruments LM3S5B91-IQC80-C1 ARM Cortex-M3 MCU, 80MHz","metaDescription":"TI LM3S5B91-IQC80-C1 Stellaris 32-bit MCU, 80MHz Cortex-M3, 256KB Flash, 96KB RAM, USB OTG/CAN/LIN, 100-LQFP, -40 to 85°C.","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":"96K 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":"LM3S5B91","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 ~ 1.32V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/3e88c5185290e27121af79c38923d69f.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5B91-IQC80-C1/alternatives.json"},"ai":{"faq":[{"question":"Can the LM3S5B91-IQC80-C1 be used with USB OTG?","answer":"Yes, the connectivity list includes USB OTG (On-The-Go), so it can operate as either a USB host or device depending on the cable and firmware configuration."},{"question":"What is the difference between LM3S5B91 and LM3S5B91-IQC80-C1?","answer":"So LM3S5B91-IQC80-C1 is the fully specified ordering code for the industrial-grade, 80 MHz, 100-LQFP version."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5B91-IQC80-C1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S5B91-IQC80-C1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}