4 clock characteristics, 1 calibrated internal rc oscillator accuracy, 2 external clock drive waveforms – Rainbow Electronics ATtiny861_V User Manual
Page 188: 3 external clock drive
188
2588B–AVR–11/06
ATtiny261/461/861
23.4
Clock Characteristics
23.4.1
Calibrated Internal RC Oscillator Accuracy
Notes:
1. Voltage range for ATtiny261V/461V/861V.
2. Voltage range for ATtiny261/461/861.
23.4.2
External Clock Drive Waveforms
Figure 23-3. External Clock Drive Waveforms
23.4.3
External Clock Drive
Table 23-1.
Calibration Accuracy of Internal RC Oscillator
Frequency
V
CC
Temperature Calibration
Accuracy
Factory
Calibration
8.0 MHz
3V
25
°C
±10%
User
Calibration
7.3 - 8.1 MHz
1.8V - 5.5V
(1)
2.7V - 5.5V
(2)
-40
°C - 85°C
±1%
V
IL1
V
IH1
Table 23-2.
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
Clock Frequency
0
4
0
10
0
20
MHz
t
CLCL
Clock Period
250
100
50
ns
t
CHCX
High Time
100
40
20
ns
t
CLCX
Low Time
100
40
20
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
%