ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 376

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

External Clock Drive
Waveforms
External Clock Drive
376
5. All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrol-
6. Values with “PRR1 – Power Reduction Register 1” enabled (0xFF).
ATmega640/1280/1281/2560/2561
4)The sum of all IOH, for ports E0-E7, G5 should not exceed 100 mA.
5)The sum of all IOH, for ports F0-F7, K0-K7 should not exceed 100 mA.
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.
lers manufactured in the same process technology. These values are preliminary values representing design targets, and
will be updated after characterization of actual silicon
Figure 155. External Clock Drive Waveforms
Table 167. External Clock Drive
Note:
Symbol
1/t
Δ
t
t
t
t
t
CHCX
CLCX
CLCH
CHCL
CLCL
t
CLCL
CLCL
All DC Characteristics contained in this datasheet are based on simulation and charac-
terization of other AVR microcontrollers manufactured in the same process technology.
These values are preliminary values representing design targets, and will be updated
after characterization of actual silicon.
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
V
IL1
V
IH1
Min.
V
500
200
200
CC
0
=1.8-5.5V
Max.
2.0
2.0
2
2
Min.
V
125
50
50
CC
0
=2.7-5.5V
Max.
1.6
1.6
8
2
Min.
V
62.5
25
25
CC
0
=4.5-5.5V
Max.
2549K–AVR–01/07
0.5
0.5
16
2
Units
MHz
ns
μs
μs
ns
ns
%