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Texas Instruments LM3S5C56-IQR80-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5C56-IQR80-A2T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5C56-IQR80-A2T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series MCU, LM3S5C56-IQR80-A2T, 32-bit single-core, 80 MHz, 512 KB Flash, 64 KB RAM, 64-LQFP (10x10 mm), -40 to 85°C, 33 I/O, CAN, USB OTG, multiple serial interfaces.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5C56-IQR80-A2T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTape & Reel (TR)
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)33
Core processorARM® Cortex®-M3
Case64-LQFP
Data convertersA/D 8x12b
Program memory size512KB (512K x 8)

Product details

The LM3S5C56-IQR80-A2T is a 32-bit ARM Cortex-M3 MCU from TI's Stellaris 5000 series, clocked at 80 MHz with 512 KB Flash and 64 KB RAM. It carries a full set of industrial connectivity — CAN, USB OTG, UART/USART, SPI, I2C, LIN, IrDA, and QEI for quadrature encoder inputs — plus an 8-channel 12-bit ADC.

80 MHz Cortex-M3 — what the speed buys you

The 80 MHz core runs a real-time control loop while handling CAN and USB traffic. The 512 KB Flash and 64 KB RAM support multiple protocol buffers without external memory.

Connectivity and peripheral set — what's on the chip

The LM3S5C56 integrates a CAN controller, USB OTG, and serial interfaces: UART/USART, SPI, SSI, I2C, Microwire, IrDA, and LIN. The QEI reads motor position from incremental encoders without bit-banging.

Frequently asked questions

What is the closest pin-compatible alternative to LM3S5C56-IQR80-A2T?

No official pin-compatible successor is listed in the available records. For new designs, consider TI's TM4C series (Cortex-M4F) but verify pinout and peripheral compatibility against your layout — migration is not drop-in.

What is LM3S5C56-IQR80-A2T's listed speed?

The core runs at 80 MHz.

What is the operating temperature range for LM3S5C56-IQR80-A2T?

It is rated for -40°C to 85°C, which covers industrial environments.

Where can I buy LM3S5C56-IQR80-A2T?

We source this obsolete part to order against an RFQ through independent distribution. Submit a request for current pricing and availability — we confirm both at quote time.