Datasheet

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STM32F303xB STM32F303xC Electrical characteristics
118
6.2 Absolute maximum ratings
Stresses above the absolute maximum ratings listed in Table 19: Voltage characteristics,
Table 20: Current characteristics, and Table 21: Thermal characteristics may cause
permanent damage to the device. These are stress ratings only and functional operation of
the device at these conditions is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Table 19. Voltage characteristics
(1)
Symbol Ratings Min Max Unit
V
DD
–V
SS
External main supply voltage (including V
DDA,
V
BAT
and V
DD
)
-0.3 4.0
V
V
DD
–V
DDA
Allowed voltage difference for V
DD
> V
DDA
-0.4
V
REF+
–V
DDA
(2)
Allowed voltage difference for V
REF+
> V
DDA
-0.4
V
IN
(3)
Input voltage on FT and FTf pins V
SS
 0.3 V
DD
+ 4.0
Input voltage on TTa pins V
SS
 0.3 4.0
Input voltage on any other pin V
SS
0.3 4.0
|V
DDx
| Variations between different V
DD
power pins - 50
mV
|V
SSX
V
SS
| Variations between all the different ground pins - 50
V
ESD(HBM)
Electrostatic discharge voltage (human body
model)
see Section 6.3.12: Electrical
sensitivity characteristics
1. All main power (V
DD
, V
DDA
) and ground (V
SS
, V
SSA
) pins must always be connected to the external power supply, in the
permitted range. The following relationship must be respected between V
DDA
and V
DD
:
V
DDA
must power on before or at the same time as V
DD
in the power up sequence.
V
DDA
must be greater than or equal to V
DD
.
2. V
REF+
must be always lower or equal than V
DDA
(V
REF+
 V
DDA)
. If unused then it must be connected to V
DDA
.
3. V
IN
maximum must always be respected. Refer to Table 20: Current characteristics for the maximum allowed injected
current values.