at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 270

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

23.4
23.5
270
Maximum Speed vs. V
PLL Characteristics
AT90PWM81
Table 23-2.
Maximum frequency is depending on V
12MHz when V
4.5V and 5.5V.
Figure 23-2.
.
Table 23-3.
1.
2.
Symbol
t
t
t
Δ
Symbol
PLL
PLL
PLL
CLCX
CLCH
CHCL
t
CLCL
IF
F
LT
CC
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...
When Vcc is below 4.5V, Max. PLL
CC
External Clock Drive (Continued)
Maximum Frequency vs. V
PLL Characteristics - V
Parameter
Low Time
Rise Time
Fall Time
Change in period from one
clock cycle to the next
is contained between 2.7V and 4.5V and equals 16Mhz when V
16Mhz
12Mhz
8Mhz
Parameter
Input Frequency
PLL Factor
Lock-in Time
2.7V
(1)
CC
CC.
F
= 2.7V to 5.5V (unless otherwise noted)
is 6.
CC
As shown in
Safe Operating Area
, AT90PWM81
Min.
30
V
CC
=2.7-5.5V
4.5V
Figure 23-2
Max.
1.6
1.6
2
Min.
4
5.5V
, the Maximum Frequency equals
Min.
20
V
CC
Typ.
8
=4.5-5.5V
CC
is contained between
Max.
0.5
0.5
2
Max.
8
64
(2)
7734M–AVR–03/10
Units
Units
MHz
μs
μs
ns
%
µS