ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 324

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

27.3
324
Speed Grades
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
Maximum frequency is depending on V
Frequency vs. V
Figure 27-1. Maximum Frequency vs. V
Figure 27-2. Maximum Frequency vs. V
20 MHz
10 MHz
4 MHz
16 MHz
4 MHz
8 MHz
1.8V
ATmega325A/ATmega325PA/ATmega3250A/ATmega3250PA/ATmega6450A/
ATmega6450P
CC
1.8V
curve is linear between 1.8V < V
2.7V
2.7V
CC.
CC
CC
As shown in
, ATmega165A/165PA/ATmega645A/ATmega645P
(10 - 20MHz)
Safe Operating Area
Safe Operating Area
CC
< 2.7V and between 2.7V < V
Figure 27-1 on page
4.5V
4.5V
324, the Maximum
5.5V
8285B–AVR–03/11
CC
5.5V
< 4.5V.