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LM3S5B91-IQC80-C3
Texas Instruments
IC MCU 32BIT 256KB FLASH 100LQFP
7981 Pcs New Original In Stock
ARM® Cortex®-M3 Stellaris® ARM® Cortex®-M3S 5000 Microcontroller IC 32-Bit Single-Core 80MHz 256KB (256K x 8) FLASH 100-LQFP (14x14)
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5.0 / 5.0
- (441 Ratings)
LM3S5B91-IQC80-C3
Product Overview
1369380
DiGi Electronics Part Number
LM3S5B91-IQC80-C3-DGManufacturer
Texas Instruments
LM3S5B91-IQC80-C3
Description
IC MCU 32BIT 256KB FLASH 100LQFPInventory
7981 Pcs New Original In Stock
ARM® Cortex®-M3 Stellaris® ARM® Cortex®-M3S 5000 Microcontroller IC 32-Bit Single-Core 80MHz 256KB (256K x 8) FLASH 100-LQFP (14x14)
Quantity
Minimum 1
Minimum 1
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LM3S5B91-IQC80-C3 Technical Specifications
Category
Embedded, Microcontrollers
Packaging
-
Series
Stellaris® ARM® Cortex®-M3S 5000
Product Status
Obsolete
DiGi-Electronics Programmable
Not Verified
Core Processor
ARM® Cortex®-M3
Core Size
32-Bit Single-Core
Speed
80MHz
Connectivity
CANbus, EBI/EMI, I2C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Peripherals
Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
Number of I/O
72
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
EEPROM Size
-
RAM Size
96K x 8
Voltage - Supply (Vcc/Vdd)
1.08V ~ 1.32V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
100-LQFP (14x14)
Package / Case
100-LQFP
Base Product Number
LM3S5B91
Datasheet & Documents
HTML Datasheet
LM3S5B91-IQC80-C3-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
3A991A2
HTSUS
8542.31.0001
Additional Information
Standard Package
90
Alternative Parts
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
何か問題があった時も、速やかに対応してくれて感謝しています。素晴らしい会社です。
de desembre 02, 2025
Their price points make high-quality technology accessible for all users.
de desembre 02, 2025
DiGi Electronics’ logistics efficiencies have significantly streamlined our procurement process.
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Frequently Asked Questions (FAQ)
Can the LM3S5B91-IQC80-C3 be safely replaced with an ATSAMS70N19A-AN in an existing 80MHz industrial control design without major firmware rewrites?
While the ATSAMS70N19A-AN offers higher performance (300MHz Cortex-M7) and more peripherals, direct replacement of the LM3S5B91-IQC80-C3 is not drop-in compatible due to architectural differences—Cortex-M3 vs. M7, distinct memory maps, and peripheral register layouts. Firmware will require significant porting effort, especially for low-level drivers (UART, SPI, ADC timing). Additionally, the ATSAMS70N19A-AN operates at 3.3V with wider I/O tolerance, whereas the LM3S5B91-IQC80-C3 runs on a tighter 1.08V–1.32V core supply, so power sequencing and level-shifting must be re-evaluated. Only consider this substitution if you're prepared for a full hardware and software validation cycle.
What are the critical risks when designing a high-reliability system around the LM3S5B91-IQC80-C3 given its obsolete status and MSL 3 rating?
The LM3S5B91-IQC80-C3’s obsolete status means long-term supply is unreliable, increasing risk of last-time buy scenarios or counterfeit parts. Combined with its Moisture Sensitivity Level (MSL) 3 (168-hour floor life), improper handling during assembly can lead to popcorning or latent failures in humid environments. To mitigate, implement strict bake-and-store protocols per J-STD-033, use nitrogen dry storage post-unpacking, and qualify second-source alternatives early. Also, avoid new designs unless legacy compatibility is mandatory—consider migrating to active TI SimpleLink or ARM-based successors like the TM4C series for better lifecycle support.
How does the internal oscillator accuracy of the LM3S5B91-IQC80-C3 impact UART and USB OTG communication in noisy industrial environments?
The LM3S5B91-IQC80-C3 relies on an internal RC oscillator, which typically has ±1–2% frequency tolerance over temperature and voltage—insufficient for reliable USB OTG operation, which requires ±0.25% or better. While UART may tolerate this inaccuracy at lower baud rates (e.g., 9600–115200 bps), timing drift can cause framing errors in extended transmissions or multi-drop networks. For robust industrial use, always use an external crystal or oscillator (e.g., 8MHz ±50ppm) connected to the XTAL pins. This ensures stable clocking for USB, CAN, and high-speed serial links, reducing resynchronization failures and EMI-induced data corruption.
Is it safe to run the LM3S5B91-IQC80-C3 at 80MHz continuously in an enclosure reaching 80°C ambient, given its -40°C to 85°C operating range?
Operating the LM3S5B91-IQC80-C3 at 80MHz near its upper temperature limit (85°C) significantly increases thermal stress and electromigration risk, potentially shortening lifespan. Although the datasheet specifies 85°C as the absolute maximum, sustained operation at this temperature—especially with high peripheral activity (DMA, ADC, USB)—can push junction temperatures beyond safe margins. TI recommends derating clock speed or reducing load above 70°C ambient. Add thermal vias under the LQFP package, ensure adequate airflow, and monitor current draw. For mission-critical applications, consider throttling to 60MHz above 75°C or switching to a more robust, currently supported MCU with better thermal headroom.
What design precautions are needed when using the LM3S5B91-IQC80-C3’s 1.2V core voltage in a mixed 3.3V system to avoid latch-up or signal integrity issues?
The LM3S5B91-IQC80-C3’s core runs at 1.08V–1.32V, but its I/O pins are 3.3V-tolerant, simplifying interfacing—however, improper power sequencing can cause latch-up. Always ensure VDD (core) and VDDA (analog) rise before or simultaneously with I/O voltages (VDDIO). Use a power supervisor IC to enforce correct sequencing and prevent reverse biasing of ESD diodes. Additionally, place 100nF decoupling caps within 2mm of each VDD pin and use a solid ground plane to minimize noise on the low-voltage core. Avoid floating inputs; enable internal pull-ups/downs on unused pins to reduce leakage and susceptibility to EMI, especially in long-trace PCB layouts.
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