ATxmega128D4-AU ATMEL [ATMEL Corporation], ATxmega128D4-AU Datasheet - Page 76

• Manufacturer Part Number: ATxmega128D4-AU
• Description: 8/16-bit Atmel XMEGA D4 Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

32.13.5
Table 32-23. Internal PLL characteristics.
Note:
32.13.6
Table 32-24. External clock used as system clock without prescaling.
Note:
8135L–AVR–06/12
Symbo
Symbo
1/t
Δt
f
t
t
OUT
t
t
t
f
CK
CH
CL
CR
CF
IN
l
l
CK
CK
1. The maximum output frequency vs. supply voltage is linear between 1.8V and 2.7V, and can never be higher than four times
1. The maximum frequency vs. supply voltage is linear between 1.8V and 2.7V, and the same applies for all other parameters
Internal Phase Locked Loop (PLL) characteristics
External clock characteristics
Parameter
Clock frequency
Clock period
Clock high time
Clock low time
Rise time (for maximum frequency)
Fall time (for maximum frequency)
Change in period from one clock cycle to the next
Parameter
Input frequency
Output frequency
Start-up time
Re-lock time
the maximum CPU frequency.
with supply voltage conditions.
(1)
Figure 32-3. External clock drive waveform.
(1)
V
IL1
V
IH1
Output frequency must be within f
V
V
t
CH
CC
CC
= 1.6 - 1.8V
= 2.7 - 3.6V
Condition
Condition
V
V
V
V
V
V
V
V
V
V
V
V
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
= 1.6 - 1.8V
= 2.7 - 3.6V
t
CL
t
CR
OUT
Min.
Min.
83.3
31.5
30.0
12.5
30.0
12.5
t
0.4
CK
20
20
0
0
t
CH
Typ.
Typ.
25
25
XMEGA D4
Max.
Max.
128
64
48
12
32
10
10
10
3
3
t
Units
Units
CF
MHz
MHz
µs
ns
%
76