External Clock Drive Waveforms; External Clock Drive - Atmel ATtiny26 Manual

External Clock Drive

Waveforms
External Clock Drive
ATtiny26(L)
128
Figure 70. External Clock Drive Waveforms
V
IH1
V
IL1
Table 63. External Clock Drive
Symbol Parameter
1/t Oscillator Frequency
CLCL
t Clock Period
CLCL
t High Time
CHCX
t Low Time
CLCX
t Rise Time
CLCH
t Fall Time
CHCL
Change in period from one clock
∆
t cycle to the next
CLCL
Table 64. External RC Oscillator, Typical Frequencies
(1)
R [kΩ]
33
10
Notes: 1. R should be in the range 3 kΩ - 100 kΩ, and C should be at least 20 pF. The C values
given in the table includes pin capacitance. This will vary with package type.
2. The frequency will vary with package type and board layout.
V = 2.7 - 5.5V V
CC CC
Min Max Min
0 8
125 62.5
50 25
50 25
1.6
1.6
2
C [pF]
22
22
= 4.5 - 5.5V
Max Units
0 16 MHz
ns
ns
ns
µs
0.5
µs
0.5
2
(2)
f
650 kHz
2.0 MHz
1477G–AVR–03/05