Rainbow Electronics ATmega64L - Manual (Page 284)

284
ATmega16(L)
2466B–09/01
8] The sum of all IOH, for ports D4-D7, should not exceed 100 mA
If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current
greater than the listed test condition.
5. Minimum V
CC
for Power-down is 2.5V.
External Clock Drive
Waveforms Figure 145. External Clock Drive Waveforms
External Clock Drive
Note: 1. R should be in the range 3k
Ω - 100kΩ, and C should be at least 20pF. The C values
given in the table includes pin capacitance. This will vary with package type.
V
IL1
V
IH1
Table 119. External Clock Drive
Symbol Parameter
V
CC
= 2.7V to 5.5 V V
CC
= 4.5V to 5.5 V
Units Min Max Min Max
1/t
CLCL
Oscillator Frequency 0 TBD 0 TBD MHz
t
CLCL
Clock Period TBD TBD ns
t
CHCX
High Time TBD TBD ns
t
CLCX
Low Time TBD TBD ns
t
CLCH
Rise Time TBD TBD µs
t
CHCL
Fall Time TBD TBD
µs
Table 120. External RC Oscillator, Typical Frequencies
R [k
Ω] (1) C [pF] f
100 70 TBD
31.5 20 TBD
6.5 20 TBD