181
6174B–ATARM–07-Nov-05
AT91FR40162S Preliminary
20. AC Characteristics
20.1
Applicable Conditions and Derating Data
20.1.1
Conditions and Timing Results
The delays are given as typical values in the following conditions:
• V
DDIO
= 3.0V
• V
DDCORE
= 1.8V
• Ambient Temperature = 25
°
C
• Load Capacitance = 0 pF
• The output level change detection is 0.5 x V
DDIO
• The input level is 0.8V for a low-level detection and is 2.0V for a high level detection.
The minimum and maximum values given in the AC characteristic tables of this datasheet take
into account the process variation and the design.
In order to obtain the timing for other conditions, the following equation should be used:
Where:
•
δ
T
°
is the derating factor in temperature given in
•
δ
VDDCORE
is the derating factor for the Core Power Supply given in
• t
DATASHEET
is the minimum or maximum timing value given in this datasheet for a load
capacitance of 0 pF.
•
δ
VDDIO
is the derating factor for the I/O Power Supply given in
• C
SIGNAL
is the capacitance load on the considered output pin.
(1)
•
δ
CSIGNAL
is the load derating factor depending on the capacitance load on the related output
pins given in Min and Max values in this datasheet.
The input delays are given as typical values.
Note:
1. The user must take into account the package capacitance load contribution (C
IN
) described in
.
t
δ
T
°
δ
VDDCORE
t
DATASHEET
×
(
)
δ
VDDIO
C
SIGNAL
δ
CSIGNAL
×
(
)
∑
×
⎝
⎠
⎛
⎞
+
⎝
⎠
⎛
⎞
×
=