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| Part Number | CY8C4045FNI-DS402T | CY8C4045FNI-DS400T | 
|---|---|---|
| Manufacturer | Infineon Technologies | Cypress Semiconductor Corp | 
| Product Status | Active | Active | 
| Core Processor | ARM® Cortex®-M0 | ARM® Cortex®-M0 | 
| Core Size | 32-Bit Single-Core | 32-Bit Single-Core | 
| Speed | 48MHz | 45MHz | 
| Connectivity | I²C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART | I²C, IrDA, LINbus, Microwire, SmartCard, SPI, SSP, UART/USART | 
| Peripherals | Brown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT | Brown-out Detect/Reset, CapSense, LCD, LVD, POR, PWM, WDT | 
| Number of I/O | 21 | 21 | 
| Program Memory Size | 32KB (32K x 8) | 32KB (32K x 8) | 
| Program Memory Type | Flash | Flash | 
| EEPROM Size | - | - | 
| RAM Size | 4K x 8 | 4K x 8 | 
| Voltage - Supply (Vcc/Vdd) | 1.7V ~ 5.5V | 1.7V ~ 5.5V | 
| Data Converters | - | - | 
| Oscillator Type | Internal | Internal | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 25-UFBGA, WLCSP | 20-UFBGA, WLCSP | 
| Supplier Device Package | 25-WLCSP (2.07×2.11) | 20-WLCSP (1.63x2.03) |