atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 132

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

External Clock Drive
Waveforms
132
5. Minimum V
ATmega161(L)
If I
greater than the listed test condition.
OH
exceeds the test condition, V
CC
for power-down is 2V.
Figure 82. External Clock
Table 50. External Clock Drive
Notes:
Symbol
1/t
t
t
t
t
t
CLCL
CHCX
CLCX
CLCH
CHCL
CLCL
1. See “External Data Memory Timing” for a description of how the duty cycle influences
OH
the timing for the external Data memory.
VIL1
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
may exceed the related specification. Pins are not guaranteed to source current
VIH1
(1)
V
CC
Min
250
100
100
0
= 2.7V to
Max
1.6
1.6
5.5
4
V
V
CC
Min
125
50
50
0
= 4.0V to
Max
0.5
0.5
5.5
8
1228D–AVR–02/07
V
Units
MHz
ns
ns
ns
µs
µs