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See Technical Specifications

ATMEGA644-20PU

RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PDIP40

Manufacturer:

Microchip Technology
Mfr.Part #:

ATMEGA644-20PU
Datasheet:

ATMEGA644-20PU Datasheet (PDF)
Series:

AVR® ATmega
Programmabe:

Not Verified
Core Processor:

AVR
Core Size:

8-Bit
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ATMEGA644-20PU General Description

Device Core = AVR / Data Bus Width Bit = 8 / Instruction Set Architecture = RISC / Family Name = ATmega / Clock Frequency Max. MHz = 20 / Program Memory Type = Flash / Program Memory Size kB = 64 / Data Memory Size kB = 2 / RAM Memory Size kB = 4 / Interfaces = USART / Interfaces = SPI / Interfaces = I²C / Interfaces = JTAG / ADC Channels = 8 / ADC Resolution Bit = 10 / DAC Resolution Bit = 10 / Number of Programmable I/Os = 32 / Number of Timers/Counters = 4 / Comparators = 1 / Supply Voltage Min. V = 2.7 / Supply Voltage Max. V = 5.5 / Operating Temperature Min. °C = -40 / Operating Temperature Max. °C = 85 / Package Type = DIP / Pins = 40 / Mounting Type = Through Hole / Packaging = Tube / Length mm = 53.2 / Width mm = 14.7 / Height mm = 4.9

Specifications

Series	AVR® ATmega	Programmabe	Not Verified
Core Processor	AVR	Core Size	8-Bit
Speed	20MHz	Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Number of I/O	32
Program Memory Size	64KB (32K x 16)	Program Memory Type	FLASH
EEPROM Size	2K x 8	RAM Size	4K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	Data Converters	A/D 8x10b
Oscillator Type	Internal	Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Base Product Number	ATMEGA644