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ATmega644PA Datasheet(PDF) 332 Page - ATMEL Corporation

Part # ATmega644PA
Description  8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash
PDF  468 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega644PA Datasheet(HTML) 332 Page - ATMEL Corporation

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332
8152G–AVR–11/09
ATmega164PA/324PA/644PA/1284P
27.2
Speed Grades
Maximum frequency is depending on V
CC. As shown in Figure 27-1, the Maximum Frequency vs.
V
CC curve is linear between 1.8V < VCC < 2.7 and between 2.7V < VCC < 4.5.
Figure 27-1. Maximum Frequency vs. V
CC, ATmega164PA/324PA/644PA/1284P
4 MHz
1.8V
2.7V
4.5V
10 MHz
20 MHz
5.5V
Safe Operating Area



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