Manual

132
ATmega161(L)
1228C–AVR–08/02
If I
OH
exceeds the test condition, V
OH
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 2V.
External Clock Drive
Waveforms
Figure 82. External Clock
Notes: 1. See “External Data Memory Timing” for a description of how the duty cycle influences
the timing for the external Data memory.
Table 50. External Clock Drive
(1)
Symbol Parameter
V
CC
=2.7Vto5.5VV
CC
=4.0Vto5.5V
UnitsMin Max Min Max
1/t
CLCL
Oscillator Frequency 0 4 0 8 MHz
t
CLCL
Clock Period 250 125 ns
t
CHCX
High Time 100 50 ns
t
CLCX
Low Time 100 50 ns
t
CLCH
Rise Time 1.6 0.5 µs
t
CHCL
Fall Time 1.6 0.5 µs
VIL1
VIH1