Rainbow Electronics ATtiny12 - Manual (Page 57)

57
ATtiny11/12
1006C–09/01
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 ATtiny11
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 µ s
t
CHCL
Fall Time 1.6 0.5 µ s
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 1.2 0 4 0 8 MHz
t
CLCL
Clock Period 833 250 125 ns
t
CHCX
High Time 333 100 50 ns
t
CLCX
Low Time 333 100 50 ns
t
CLCH
Rise Time 1.6 1.6 0.5 µ s
t
CHCL
Fall Time 1.6 1.6 0.5 µ s
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