ATtiny10/11/12
53
External Clock Drive Waveforms
Figure 33. External Clock
Note:
R should be in the range 3-100 k
Ω
, and C should be at least 20 pF. The C values given in the table includes pin capacitance.
This will vary with package type.
External Clock Drive ATtiny10/11
Symbol
Parameter
V
CC
= 2.7V to 4.0V
V
CC
= 4.0V to 5.5V
Units
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency
0
2
0
6
MHz
t
CLCL
Clock Period
500
167
ns
t
CHCX
High Time
200
67
ns
t
CLCX
Low Time
200
67
ns
t
CLCH
Rise Time
1.6
0.5
µs
t
CHCL
Fall Time
1.6
0.5
µs
External Clock Drive ATtiny12
Symbol
Parameter
V
CC
= 1.8V to 2.7V
V
CC
= 2.7V to 4.0V
V
CC
= 4.0V to 5.5V
Units
Min
Max
Min
Max
Min
Max
1/t
CLCL
Oscillator Frequency
0
1
0
4
0
8
MHz
t
CLCL
Clock Period
1000
250
125
ns
t
CHCX
High Time
400
100
50
ns
t
CLCX
Low Time
400
100
50
ns
t
CLCH
Rise Time
1.6
1.6
0.5
µs
t
CHCL
Fall Time
1.6
1.6
0.5
µs
Table 29. External RC Oscillator, Typical Frequencies
R [k
Ω
]
C [pF]
f
100
70
100 kHz
31.5
20
1.0 MHz
6.5
20
4.0 MHz
VIL1
VIH1
