STM32F103xx
Electrical characteristics
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5.3.12
I/O port pin characteristics
General input/output characteristics
Unless otherwise specified, the parameters given in
are derived from tests
performed under ambient temperature and V
DD
supply voltage conditions summarized in
All unused pins must be held at a fixed voltage, by using the I/O output mode, an external
pull-up or pull-down resistor (see
Table 29.
I/O static characteristics
(1)
1.
V
DD
= 3.3 V, T
A
=
−
40 to 105 °C unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
IL
Input low level voltage
(2)
2.
Values based on characterization results, and not tested in production.
TTL ports
–0.5
0.8
V
V
IH
IO TC input high level
voltage
(2)
2
V
DD
+0.5
IO FT high level voltage
(2)
2
5.5V
V
IL
Input low level voltage
(2)
CMOS ports
–0.5
0.35 V
DD
V
V
IH
Input high level voltage
(2)
0.65 V
DD
V
DD
+0.5
V
hys
IO TC Schmitt trigger voltage
hysteresis
(3)
3.
Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.
200
mV
IO TC Schmitt trigger voltage
hysteresis
(3)
5% V
DD
(4)
4.
With a minimum of 100 mV.
mV
I
lkg
Input leakage current
(5)
5.
Leakage could be higher than max. if negative current is injected on adjacent pins.
V
SS
≤
V
IN
≤
V
DD
Standard I/Os
±
1
µA
V
IN
= 5 V
5 V tolerant I/Os
3
R
PU
Weak pull-up equivalent
resistor
(6)
6.
Pull-up and pull-down resistors are designed with a true resistance in series with a switchable
PMOS/NMOS. This MOS/NMOS contribution
to the series resistance is minimum
(~10% order)
.
V
IN
=
V
SS
30
40
50
k
Ω
R
PD
Weak pull-down equivalent
resistor
V
IN
=
V
DD
30
40
50
k
Ω
C
IO
I/O pin capacitance
5
pF