ATMEGA8-16AI SL383 Atmel, ATMEGA8-16AI SL383 Datasheet - Page 244

• Manufacturer Part Number: ATMEGA8-16AI SL383
• Description: Semiconductors and Actives, Microprocessors, Microcontrollers
• Manufacturer: Atmel

External Clock
Drive Waveforms
External Clock
Drive
244
ATmega8(L)
Figure 114. External Clock Drive Waveforms
Table 99. External Clock Drive
Table 100. External RC Oscillator, Typical Frequencies
Notes:
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
1. R should be in the range 3 kΩ - 100 kΩ, and C should be at least 20 pF. The C values given in
2. The frequency will vary with package type and board layout.
the table includes pin capacitance. This will vary with package type.
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period from one
clock cycle to the next
R [kΩ]
33
10
V
IL1
(1)
V
IH1
V
CC
Min
125
50
50
0
= 2.7V to
C [pF]
22
22
Max
1.6
1.6
5.5
8
2
V
V
CC
62.5
Min
25
25
0
= 4.5V to
650 kHz
2.0 MHz
Max
0.5
0.5
16
5.5
2
f
(2)
V
Units
2486W–AVR–02/10
MHz
ns
ns
ns
μs
μs
%