
196
ATmega8515(L)
2512A–AVR–04/02
External Clock Drive
Waveforms
Figure 86. ExternalClock Drive Waveforms
External Clock Drive
Note: 1. R should beinthe range 3kΩ - 100 kΩ, andCshould beatleast20pF.The C values
given in thetableincludespin capacitance. Thiswill vary withpackage type.
V
IL1
V
IH1
Table 96. ExternalClock Drive
Symbol Parameter
V
CC
= 2.7 - 5.5VV
CC
= 4.5 - 5.5V
UnitsMin Max Min Max
1/t
CLCL
OscillatorFrequency 08016MHz
t
CLCL
Clock Period 125 62.5 ns
t
CHCX
High Time 50 25 ns
t
CLCX
Low Time 50 25 ns
t
CLCH
RiseTime 1.6 0.5 µs
t
CHCL
Fall Time 1.6 0.5 µs
Table 97. External RCOscillator, TypicalFrequencies
(1)
R [kΩ] C [pF] f
100 70TBD
31.5 20 TBD
6.5 20 TBD
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