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| Part Number | ATMEGA168-20PI | ATMEGA168-20PU | ATMEGA168-20AI | ATMEGA168-20MI |
|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Active | Obsolete | Obsolete |
| Core Processor | AVR | AVR | AVR | AVR |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 20MHz | 20MHz | 20MHz | 20MHz |
| Connectivity | I²C, SPI, UART/USART | I²C, SPI, UART/USART | I²C, SPI, UART/USART | I²C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 23 | 23 | 23 | 23 |
| Program Memory Size | 16KB (8K x 16) | 16KB (8K x 16) | 16KB (8K x 16) | 16KB (8K x 16) |
| Program Memory Type | Flash | Flash | Flash | Flash |
| EEPROM Size | 512 x 8 | 512 x 8 | 512 x 8 | 512 x 8 |
| RAM Size | 1K x 8 | 1K x 8 | 1K x 8 | 1K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Data Converters | A/D 6x10b | A/D 6x10b | A/D 8x10b | A/D 8x10b |
| Oscillator Type | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole | Through Hole | Surface Mount | Surface Mount |
| Package / Case | 28-DIP (0.300", 7.62mm) | 28-DIP (0.300", 7.62mm) | 32-TQFP | 32-VFQFN Exposed Pad |
| Supplier Device Package | 28-PDIP | 28-PDIP | 32-TQFP (7x7) | 32-VQFN (5x5) |
