ATMEGA644P-20MQ Atmel, ATMEGA644P-20MQ Datasheet - Page 329

• Manufacturer Part Number: ATMEGA644P-20MQ
• Description: MCU AVR 64K FLASH 20MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20MQ

• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VQFN Exposed Pad
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

25.2
8011O–AVR–07/10
Speed Grades
Maximum frequency is depending on V
mum Frequency vs. V
4.5V.
Figure 25-1. Maximum Frequency vs. V
Figure 25-2. Maximum Frequency vs. V
10 MHz
20 MHz
10 MHz
4 MHz
1.8V
2.7V
CC
curve is linear between 1.8V < V
Safe Operating Area
Safe Operating Area
2.7V
CC.
CC
CC
4.5V
As shown in
, ATmega164PV/ATmega324PV/ATmega644PV
, ATmega164P/324P/644P
ATmega164P/324P/644P
5.5V
Figure 25-1
CC
< 2.7V and between 2.7V < V
5.5V
and
Figure
25-2, the Maxi-
CC
329
<