ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 288

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

External Clock Drive
Waveforms
External Clock Drive
288
ATmega325/3250/645/6450
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.
Figure 127. External Clock Drive Waveforms
Table 123. External Clock Drive
Figure 128. Maximum Frequency vs. V
Symbol
1/t
t
t
t
t
t
∆
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
8 MHz
4 MHz
V
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
IL1
V
IH1
1.8V
1000
Min.
V
400
400
CC
0
=1.8-5.5V
Safe Operating Area
2.7V
Max.
CC
2.0
2.0
1
2
(4 - 10 MHz).
Min.
V
125
50
50
0
CC
=2.7-5.5V
Max.
1.6
1.6
8
2
V
Min.
62.5
5.5V
25
25
CC
0
=4.5-5.5V
2570A–AVR–09/04
Max.
0.5
0.5
16
2
Units
MHz
ns
ns
ns
µs
µs
%