| PartNumber | ATMEGA164P-20MU | ATMEGA164P-20MQ | ATMEGA164P-20MQR |
| Description | 8-bit Microcontrollers - MCU AVR 16K FLASH 1K SRAM 512B EE-20MHZ | 8-bit Microcontrollers - MCU AVR 16KB, 512B EE 20MHz 1KB SRAM, 5V | 8-bit Microcontrollers - MCU AVR,16KB FLASH,20MHZ EXT TEMP,5V |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | VQFN-44 | VQFN-44 | VQFN-44 |
| Series | ATmega164P | ATmega164P | ATmega164P |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz |
| Program Memory Size | 16 kB | 16 kB | 16 kB |
| Data RAM Size | 1 kB | 1 kB | 1 kB |
| Number of I/Os | 32 I/O | 32 I/O | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tray | Tray | Reel |
| Height | 0.88 mm | 0.88 mm | - |
| Length | 7 mm | 7 mm | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Width | 7 mm | 7 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | SRAM |
| Data ROM Size | 512 B | 512 B | 512 B |
| Data ROM Type | EEPROM | EEPROM | EEPROM |
| Interface Type | 2-Wire, JTAG, SPI, USART | 2-Wire, JTAG, SPI, USART | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | - |
| Processor Series | megaAVR | megaAVR | megaAVR |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 360 | 360 | 4000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V, 4.5 V | - |
| Tradename | AVR | AVR | AVR |
| Unit Weight | 0.036897 oz | - | - |