ATMEGA640 datasheet(357/436 Pages) MICROCHIP

Part #	ATMEGA640

Description	8-bit Microcontroller with 16/32/64KB In-System Programmable Flash

PDF	436 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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357 / 436 page

357

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current

greater than the listed test condition.

5. Values with “PRR1 – Power Reduction Register 1” on page 56 enabled (0xFF).

31.2 Speed Grades

Maximum frequency is depending on VCC. As shown in Figure 31-1 trough Figure 31-4 on page 358, the Maximum

Frequency vs. VCC curve is linear between 1.8V < VCC < 2.7V and between 2.7V < VCC < 4.5V.

31.2.1

8MHz

Figure 31-1. Maximum Frequency vs. VCC, ATmega640V/1280V/1281V/2560V/2561V

Figure 31-2. Maximum Frequency vs. VCC when also No-Read-While-Write Section

(1), ATmega2560V/ATme-

ga2561V, is used

Note:

1. When only using the Read-While-Write Section of the program memory, a higher speed can be achieved at low

voltage, see “Read-While-Write and No Read-While-Write Flash Sections” on page 310 for addresses.

8 MHz

4 MHz

1.8V

2.7V

5.5V

Safe Operating Area

8 MHz

2 MHz

1.8V

2.7V

5.5V

Safe Operating Area

ATMEGA640 Datasheet(PDF) 357 Page - Microchip Technology