ATMEGA644P-20AU vs ATMEGA644A-AU Comparison
Detailed side-by-side comparison of ATMEGA644P-20AU by Microchip Technology and ATMEGA644A-AU by Microchip Technology. Compare key specifications, electrical parameters, packaging, lifecycle status, pricing, and availability to determine the best component for your design requirements.
Microchip Technology
ATMEGA644P-20AU - 8-Bit AVR MCU 20MHz 64KB Flash TQFP-44 | Microchip
ATMEGA644P-20AU ✓ ActiveMicrochip Technology
ATMEGA644A-AU - 8-bit AVR MCU 20MHz 64KB Flash | Microchip
ATMEGA644A-AU ✓ ActiveSpecification Comparison
| Parameter | ATMEGA644P-20AU | ATMEGA644A-AU |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Category | Microcontrollers | Microcontrollers |
| Lifecycle Status | Active | Active |
| Stock Status | In Stock | In Stock |
| Unit Price (USD) | $3.95 | $5.40 |
| Core | AVR 8-bit RISC | — |
| Core Size | 8-Bit | — |
| Maximum Clock Frequency | 20 MHz | — |
| Program Memory Size | 64 KB (32K x 16) FLASH | 64 KB Flash (32K x 16) |
| Data RAM Size | 4 KB SRAM | — |
| EEPROM Size | 2 KB | — |
| Supply Voltage Range | 4.5 V to 5.5 V (20 MHz grade) | 1.8 V to 5.5 V |
| Number of USARTs | 2 | — |
| ADC Resolution | 10-bit | — |
| Peripherals | SPI, TWI (I2C), PWM timers, WDT, BOD | — |
| I/O Count | 32 | — |
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (Industrial) |
| Throughput | Up to 20 MIPS at 20 MHz (approx. 1 MIPS/MHz) | — |
| Programming | In-System Programmable (ISP) via SPI | — |
| RoHS Status | Compliant (green package) | — |
| Core Architecture | — | 8-bit AVR enhanced RISC |
| Program Memory Type | — | ISP FLASH with Read-While-Write |
| EEPROM | — | 2 KB |
| SRAM | — | 4 KB |
| Maximum CPU Speed | — | 20 MHz (20 MIPS) |
| General Purpose I/O | — | 32 lines |
| Working Registers | — | 32 general purpose registers |
| USART | — | 2 |
| Timer/Counters | — | 3 (with compare modes and PWM) |
| ADC | — | 8-channel, 10-bit |
| Serial Interfaces | — | TWI (2-wire, I2C-compatible), SPI |
| Real Time Counter | — | Yes (RTC) |
| Device Series | — | ATmega644A |