Datasheet

STM32F051x Electrical characteristics
Doc ID 022265 Rev 3 69/105
6.3.13 I/O port characteristics
General input/output characteristics
Unless otherwise specified, the parameters given in Ta bl e 5 0 are derived from tests
performed under the conditions summarized in Tabl e 20 . All I/Os are CMOS and TTL
compliant.
Table 50. I/O static characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
IL
Standard I/O input low
level voltage
–0.3 - 0.3V
DD
+0.07
V
TTa I/O input low level
voltage
–0.3 - 0.3V
DD
+0.07
FT and FTf
(1)
I/O input
low level voltage
–0.3 - 0.475V
DD
–0.2
BOOT0 input low level
voltage
0 - 0.3V
DD
–0.3
V
IH
Standard I/O input high
level voltage
0.445V
DD
+0.398 - V
DD
+0.3
TTa I/O input high level
voltage
0.445V
DD
+0.398 - V
DD
+0.3
FT and FTf
(1)
I/O input
high level voltage
0.5V
DD
+0.2 - 5.5
BOOT0 input high level
voltage
0.2V
DD
+0.95 - 5.5
V
hys
Standard I/O Schmitt
trigger voltage
hysteresis
(2)
200 - -
mV
TTa I/O Schmitt trigger
voltage hysteresis
(2)
200 - -
FT and FTf I/O Schmitt
trigger voltage
hysteresis
(2)
100 - -
BOOT0 input Schmitt
trigger voltage
hysteresis
(2)
300 - -