ATMEGA644A-AU Atmel, ATMEGA644A-AU Datasheet - Page 333

• Manufacturer Part Number: ATMEGA644A-AU
• Description: IC MCU AVR 64K FLASH 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644A-AU

• 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): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

27.2
8272A–AVR–01/10
Speed Grades
Maximum frequency is depending on V
V
Figure 27-1. Maximum Frequency vs. V
164A/164PA/324A/324PA/644A/644PA/1284/1284P
CC
curve is linear between 1.8V < V
20 MHz
10 MHz
4 MHz
1.8V
2.7V
CC
CC.
< 2.7 and between 2.7V < V
CC
As shown in
,
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
Safe Operating Area
Figure
27-1, the Maximum Frequency vs.
4.5V
CC
< 4.5.
5.5V
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