CY8C3445LTI-081 - 50MHz 8-bit USB MCU | Infineon Technologies
MPN: CY8C3445LTI-081 ✓ ActiveCY8C3445LTI-081 Overview
A programmable system-on-chip, or PSoC, integrates a processor core, programmable digital blocks, analog resources, and connectivity into one configurable device. Within the embedded-controller hierarchy, PSoC 3 belongs to the 8-bit microcontroller family and combines MCU operation with programmable mixed-signal capabilities. This architecture lets engineers place functions such as timers, serial interfaces, analog conversion, and control logic into a compact system while retaining the familiar 8051 instruction set.
The CY8C3445LTI-081 provides 32 KB of flash, 4 KB of SRAM, 1 KB of data EEPROM, and 8 KB of ECC flash according to the verified Keil device record. It supports a maximum clock frequency of 50 MHz and includes USB plus serial connectivity, dual datapointers, four flash protection levels, 27 interrupt sources, and eight interrupt priority levels. These resources support connected consumer, industrial, and embedded-control products that need flexible I/O and mixed-signal support in a small package.
The 8051 processing architecture provides a familiar development base for embedded software, while the PSoC programmable blocks allow peripheral behavior to be adapted to the product rather than relying entirely on fixed silicon functions. The verified device record identifies one Peripheral Hub Unit with eight parallel access paths. At the same time, the flash protection levels and EEPROM provide mechanisms for separating executable code from frequently updated data or application-specific parameters.
Typical uses include USB-connected human-interface devices, compact industrial controllers, serial data acquisition equipment, and consumer products requiring several mixed-signal functions. The USB interface is especially useful for configuration, firmware update, logging, or direct host communication. The 32 KB flash capacity is appropriate for moderate embedded applications, while 4 KB of SRAM supports application state, buffers, and interrupt-driven control tasks.
Designers should verify the exact USB electrical implementation, exposed-pin assignments, clock configuration, analog resources, and power requirements against the manufacturer datasheet before schematic release. Because the verified 68-QFN pin map is not included in the supplied source data, this page does not reproduce a potentially misleading pinout. The package drawing should also be checked against the source land pattern and exposed-pad requirements.
This page consolidates verified distributor specifications, programming-oriented device details, source links, application guidance, and a constrained drop-in comparison into one engineering-oriented resource. It also distinguishes confirmed specifications from parameters that require confirmation in the manufacturer datasheet, helping designers make procurement and design decisions without inventing missing technical data.
Drop-in alternatives for CY8C3445LTI-081 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
CY8C3445LTI-081T
✅ Drop-In📋 Reference alternative (not in catalog)
CY8C3445LTI-080
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
CY8C3446LTI-081
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
CY8C3447LTI-081
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
CY8C3445LTI-083
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
CY8C3445LTI-081 Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit PSoC 3 flash programmable system-on-chip microcontroller |
| Processor Architecture | 8051 |
| Maximum Operating Frequency | 50 MHz |
| Program Flash Memory | 32 KB |
| Flash Organization | 32K x 8 bits |
| Static RAM | 4 KB |
| Data EEPROM | 1 KB |
| ECC Flash | 8 KB |
| Connectivity | USB plus serial |
| Data Pointers | 2 |
| Flash Protection Levels | 4 |
| Interrupt Sources | 27 |
| Interrupt Priority Levels | 8 |
| Peripheral Hub Unit | 1 |
| Peripheral Hub Parallel Access Paths | 8 |
| Package | 68-QFN (8 x 8 mm) |
| Mounting Type | Surface mount |
CY8C3445LTI-081 68-qfn (8 x 8 mm) Pin Configuration Guide
Pin configuration for CY8C3445LTI-081 (68-qfn (8 x 8 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for CY8C3445LTI-081.
Refer to the datasheet for full pin configuration.
Typical Applications
CY8C3445LTI-081 is suitable for 6 applications: USB Human-Interface Devices, Industrial Serial Controllers, Data-Acquisition and Sensor-Control Systems, Consumer Configuration and Control Products, Programmable Logic and Timer Products, Connected Measurement and Test Equipment.
USB Human-Interface Devices
The CY8C3445LTI-081 fits USB-connected keyboards, control panels, and other human-interface devices because it combines USB plus serial connectivity with a 50 MHz 8051 core. Its 32 KB flash provides space for application firmware, USB descriptors, configuration data, and control routines, while 4 KB of SRAM can support report buffers and state machines. The PSoC programmable blocks allow board-specific timing, input scanning, and interface functions to be integrated without relying on numerous fixed peripherals. Designers should confirm the supported USB device class, clock requirements, bus-power limits, and transceiver connection details in the manufacturer datasheet. USB enumeration tests, suspend current measurements, and endpoint stress tests should be included before release because the supplied verified data does not specify those electrical values.
Recommended
Industrial Serial Controllers
The CY8C3445LTI-081 is suitable for compact industrial controllers that combine local control with USB or serial host communication. Its 8051 architecture and operation up to 50 MHz support event handling and real-time control, while 32 KB of flash and 4 KB of SRAM are adequate for moderate protocol stacks, timers, diagnostics, and configuration storage. The PSoC architecture can reduce discrete peripheral count by placing serial, timing, and mixed-signal functions into configurable blocks. For factory equipment, engineers should verify industrial temperature qualification, ESD ratings, isolation strategy, and supply limits because those details are not present in the supplied source data. A robust product design should also include brownout handling, watchdog behavior, secured firmware updates, and deterministic recovery after communication faults or power interruption.
Recommended
Data-Acquisition and Sensor-Control Systems
The CY8C3445LTI-081 can serve as the control hub in a small data-acquisition or sensor-control product because programmable PSoC resources support configurable digital and analog functions alongside the 8051 processor. The 27 interrupt sources and eight priority levels help organize time-sensitive acquisition, communication, and control tasks, while 4 KB of SRAM accommodates sampled data and working state. The device's 1 KB of data EEPROM and four flash protection levels also support parameter storage and controlled firmware organization. Actual analog performance depends on the selected PSoC block, external component network, ADC or comparator implementation, and operating configuration, none of which are quantified in the supplied data. Engineers should confirm the relevant analog accuracy, sampling behavior, and calibration method in the family datasheet before setting measurement expectations.
Recommended
Consumer Configuration and Control Products
The CY8C3445LTI-081 is appropriate for consumer accessories that require embedded control, USB connectivity, and a modest amount of programmable logic in a compact 68-QFN package. Its 32 KB flash can hold firmware and configuration, while the programmable PSoC resources can consolidate timing, serial interfaces, and analog functions. This integration can reduce board area in devices such as programmable controllers, appliance interfaces, and configuration docks. The trade-off is that firmware must correctly initialize and allocate the configurable blocks, and a 32 KB code limit may constrain large protocol stacks or elaborate user interfaces. Before production, verify USB enumeration behavior, power consumption in operating and sleep states, brownout recovery, and all exposed-pad assembly requirements. No numeric current or standby-power values were supplied, so those results must be measured rather than assumed.
Recommended
Programmable Logic and Timer Products
The CY8C3445LTI-081 can implement timer, PWM, sequencing, and protocol-oriented functions in systems that benefit from programmable mixed-signal peripherals. The verified record identifies timer and PWM functionality through the PSoC feature set and confirms one Peripheral Hub Unit with eight parallel access paths. These resources may reduce the need for separate programmable-logic or timing ICs when the required functions fit the device's exact block configuration. The 8051 core remains available for supervisory logic, status reporting, and USB updates. Verification should include maximum timer frequency, PWM resolution, trigger latency, and routing constraints, since the supplied sources do not provide those values. Engineers should also test startup and watchdog behavior across brownout conditions and ensure firmware does not rely on undocumented peripheral routing assumptions.
Recommended
Connected Measurement and Test Equipment
The CY8C3445LTI-081 is well matched to compact measurement instruments and test fixtures that need local sequencing, USB connectivity, serial communication, and configurable analog or digital resources. The 50 MHz 8051 core can coordinate acquisition and control routines, the 27 interrupt sources support event-heavy operation, and 32 KB flash accommodates moderate firmware. PSoC configurability can reduce discrete logic in a production tester, meter, programmer, or fixture controller. Measurement accuracy still depends on the selected analog block, reference source, resistor network, layout, and calibration process; none of those detailed values are present in the verified source data. Prototype evaluation should therefore focus on channel isolation, noise performance, timing margins, and calibration stability. Production validation should include USB reliability, field update recovery, and repeated power-cycle testing.
Recommended
Recommended Products Summary
Engineering reference data for CY8C3445LTI-081 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY8C3445LTI-081T | CY8C3445LTI-080 | CY8C3446LTI-081 | CY8C3447LTI-081 | CY8C3445LTI-083 |
|---|---|---|---|---|---|---|
| Package | 68-QFN (8 x 8 mm) | 68-QFN (8 x 8 mm) - candidate package | 68-QFN (8 x 8 mm) - candidate package | 68-QFN (8 x 8 mm) - candidate package | 68-QFN (8 x 8 mm) - candidate package | 68-QFN (8 x 8 mm) - candidate package |
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Processor Architecture | 8051, 8-bit | 8051, 8-bit | 8051, 8-bit | 8051, 8-bit | 8051, 8-bit | 8051, 8-bit |
Key Differentiators
- Integrated USB and programmable mixed-signal architecture (vs ATMEGA328P-MUR)
- Higher stated clock rate (vs ATMEGA328P-MUR)
- More SRAM for buffer-oriented control tasks (vs AT90USB646-MUR)
- Compact 8 x 8 mm QFN integration (vs ATMEGA328P-MNR)
Design Notes
Do not treat an ordering-code suffix as proof of drop-in compatibility. The supplied sources explicitly identify CY8C3445LTI-081T, while the other listed candidates come from same-family LLM knowledge. Before replacing the original device, compare the official ordering table, pin names, package drawing, exposed pad, temperature grade, clock range, memory configuration, USB implementation, and errata. This is particularly important for PSoC 3 parts because firmware configuration and bootloader assumptions can differ even when the mechanical outline appears unchanged.
Plan the power tree around the manufacturer's recommended operating, sleep, and USB-suspend conditions; none of those current values were included in the verified source snippets. Decouple each supply pin near the device, maintain the required capacitor type and ESR, and avoid routing switching-converter return current beneath the QFN. Because the device supports USB plus serial connectivity, separate USB data routing from sensitive analog inputs and verify the effect of bus-powered and self-powered operating modes in the final board-level test plan.
Use the official 68-QFN land pattern and exposed-pad assembly guidance rather than a generic QFN footprint. The supplied sources do not expose the numbered pin map, so keep high-speed USB routing short, provide a continuous ground reference, place decoupling capacitors close to their intended pins, and isolate oscillator and analog routing from switching nodes. Check paste, stencil, solder mask, and thermal-via recommendations from the manufacturer because these assembly details are not present in the verified data.
Validate the complete programmable-peripheral allocation in firmware before committing the PCB. The device offers configurable PSoC resources, but routing a signal to the wrong block or assuming a fixed pin function can create timing and connectivity failures that are difficult to diagnose. During firmware review, confirm clock sources, interrupt priorities, analog-block use, USB endpoints, UART or serial routing, boot behavior, and fallback configurations. Also test field recovery after a failed firmware update because the verified data does not state the bootloader guarantees.
Compliance Information
The supplied sources do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for this exact ordering code. AEC-Q100 is not applicable to this general-purpose 8051 microcontroller unless a separate automotive-qualified ordering code is explicitly identified by the manufacturer.
