Rainbow Electronics ATmega8515L - Manual (Page 196)

196
ATmega8515(L)
2512A–AVR–04/02
External Clock Drive
Waveforms Figure 86. External Clock Drive Waveforms
External Clock Drive
Note: 1. R should be in the range 3 k
Ω - 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.
V
IL1
V
IH1
Table 96. External Clock Drive
Symbol Parameter
V
CC
= 2.7 - 5.5 V V
CC
= 4.5 - 5.5 V
Units Min Max Min Max
1/t
CLCL
Oscillator Frequency 0 8 0 16 MHz
t
CLCL
Clock Period 125 62.5 ns
t
CHCX
High Time 50 25 ns
t
CLCX
Low Time 50 25 ns
t
CLCH
Rise Time 1.6 0.5 µs
t
CHCL
Fall Time 1.6 0.5 µs
Table 97. External RC Oscillator, Typical Frequencies (1)
R [k
Ω]
C [pF] f
100 70 TBD
31.5 20 TBD
6.5 20 TBD