303
4317I–AVR–01/08
AT90PWM2/3/2B/3B
26.4
Maximum Speed vs. V
CC
Maximum frequency is depending on V
CC.
As shown in
, the Maximum Frequency
equals 8Mhz when V
CC
is contained between 2.7V and 4.5V and equals 16Mhz when V
CC
is
contained between 4.5V and 5.5V.
Figure 26-2. Maximum Frequency vs. V
CC
, AT90PWM2/2B/3/3B
26.5
PLL Characteristics
.
Note:
While connected to external clock or external oscillator, PLL Input Frequency must be selected to
provide outputs with frequency in accordance with driven parts of the circuit (CPU core, PSC...)
Safe Operating Area
16Mhz
8Mhz
2.7V
5.5V
4.5V
Table 26-3.
PLL Characteristics - V
CC
= 2.7V to 5.5V (unless otherwise noted)
Symbol
Parameter
Min.
Typ.
Max. Units
PLL
IF
Input Frequency
0.5
1
2
MHz
PLL
F
PLL Factor
64
PLL
LT
Lock-in Time
64
µS
