Datasheet

DocID025409 Rev 8 117/121
STM32F334x4 STM32F334x6 STM32F334x8 Package information
117
Example: high-performance application
Assuming the following application conditions:
Maximum ambient temperature T
Amax
= 82 °C (measured according to JESD51-2),
I
DDmax
= 50 mA, V
DD
= 3.5 V, maximum 20 I/Os used at the same time in output at low
level with I
OL
= 8 mA, V
OL
= 0.4 V and maximum 8 I/Os used at the same time in output
mode at low level with I
OL
= 20 mA, V
OL
= 1.3 V
P
INTmax
= 50 mA × 3.5 V = 175 mW
P
IOmax
= 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW
This gives: P
INTmax
= 175 mW and P
IOmax
= 272 mW
P
Dmax
= 175 + 272 = 447 mW
Thus: P
Dmax
= 447 mW
Using the values obtained in Table 80: Package thermal characteristics T
Jmax
is calculated
as follows:
– For LQFP64, 45 °C/W
T
Jmax
= 82 °C + (45 °C/W × 447 mW) = 82 °C + 20.1 °C = 102.1 °C
This is within the range of the suffix 6 version parts (–40 < T
J
< 105 °C).
In this case, parts must be ordered at least with the temperature range suffix 6 (see
Table 81: Ordering information scheme).
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