Datasheet

293
2466T–AVR–07/10
ATmega16(L)
5] The sum of all IOH, for ports D3 - D7, should not exceed 100 mA.
6] The sum of all IOH, for ports C0 - C7, 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. Refer to “External Clock” on page 31 for details.
Notes: 1. R should be in the range 3 kΩ - 100 kΩ, and C should be at least 20 pF.
2. The frequency will vary with package type and board layout.
V
IL1
V
IH1
Table 118. External Clock Drive
(1)
Symbol Parameter
V
CC
= 2.7V to 5.5VV
CC
= 4.5V to 5.5V
UnitsMin Max Min Max
1/t
CLCL
Oscillator Frequency 0 8 0 16 MHz
t
CLCL
Clock Period 125 62.5
nst
CHCX
High Time 50 25
t
CLCX
Low Time 50 25
t
CLCH
Rise Time 1.6 0.5
μs
t
CHCL
Fall Time 1.6 0.5
Δt
CLCL
Change in period from
one clock cycle to the
next
22%
Table 119. External RC Oscillator, Typical Frequencies (V
CC
= 5)
R [kΩ]
(1)
C [pF] f
(2)
33 22 650 kHz
10 22 2.0 MHz