40MX and 42MX FPGA Families
Revision 11 1-25
Junction Temperature (T
J
)
The temperature variable in the Designer software refers to the junction temperature, not the ambient
temperature. This is an important distinction because the heat generated from dynamic power
consumption is usually hotter than the ambient temperature. EQ , shown below, can be used to calculate
junction temperature.
Junction Temperature = ΔT + T
a
(1)
EQ 1
Where:
T
a
= Ambient Temperature
ΔT = Temperature gradient between junction (silicon) and ambient
ΔT = θ
ja
* P (2)
P = Power
θ
ja
= Junction to ambient of package. θ
ja
numbers are located in Table 1-21 on page 1-26.
Figure 1-15 • Typical Output Drive Characteristics (Based Upon Measured Data)
0123456
MX PCI IOL
MX PCI IOH
PCI IOL Maximum
PCI IOL Minimum
PCI IOH Minimum
PCI IOH Maximum
Voltage Out (V)
–0.20
–0.15
–0.10
–0.05
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Current (A)
