External Clock Drive - Atmel ATtiny25 Manual

22.3

External Clock Drive

ATtiny25/45/85
152
Table 22-2. External Clock Drive
Symbol Parameter
1/t Clock 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 cycle to
Δ
t
CLCL
the next
Note: 1. All DC Characteristics contained in this data sheet result from actual silicon characterization.
Figure 22-2. Maximum Frequency vs. V
16 MHz
8 MHz
(1)
. PRELIMINARY
V
CC
Min.
0
100
40
40
CC
Safe Operating
Area
2.7V 4.5V
V = 4.5 -
CC
= 2.7 - 5.5V 5.5V
Max. Min. Max.
8 0 16
50
20
20
1.6 0.5
1.6 0.5
2
5.5V
Units
MHz
ns
ns
ns
µs
µs
2 %
7598H–AVR–07/09