External clock drive waveforms, External clock drive, Maximum speed vs. vcc – Rainbow Electronics ATmega3290P_V User Manual
Page 315: External clock drive maximum speed vs. v
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315
ATmega329/3290/649/6490
2552H–AVR–11/06
External Clock Drive
Waveforms
Figure 137. External Clock Drive Waveforms
External Clock Drive
Maximum Speed vs. V
CC
Figure 138. Maximum Frequency vs. V
CC
(4 - 8 MHz).
V
IL1
V
IH1
Table 139. External Clock Drive
Symbol
Parameter
V
CC
=1.8-5.5V
V
CC
=2.7-5.5V
V
CC
=4.5-5.5V
Units
Min.
Max.
Min.
Max.
Min.
Max.
1/t
CLCL
Oscillator
Frequency
0
4
0
8
0
16
MHz
t
CLCL
Clock Period
1000
125
62.5
ns
t
CHCX
High Time
400
50
25
ns
t
CLCX
Low Time
400
50
25
ns
t
CLCH
Rise Time
2.0
1.6
0.5
μs
t
CHCL
Fall Time
2.0
1.6
0.5
μs
Δ
t
CLCL
Change in period
from one clock
cycle to the next
2
2
2
%
8 MHz
4 MHz
1.8V
2.7V
5.5V
Safe Operating Area
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