CD00161566 Datasheet, PDF (68/105 Pages) STMicroelectronics – nullMedium-density performance line ARM-based 32-bit MCU

Electrical characteristics
STM32F103x8, STM32F103xB
Figure 30. I/O AC characteristics definition
90%
10%
50%
10%
50%
90%
5.3.14
EXTERNAL
OUTPUT
ON 50pF
tr(IO)out
tf(IO)out
T
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
when loaded by 50pF
ai14131c
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, R_PU (see Table 35).
Unless otherwise specified, the parameters given in Table 38 are derived from tests
performed under the ambient temperature and V_DD supply voltage conditions summarized
in Table 9.
Table 38. NRST pin characteristics
Symbol
Parameter
Conditions Min Typ Max Unit
V_IL(NRST)(1) NRST Input low level voltage
V_IH(NRST)(1) NRST Input high level voltage
–0.5
2
-
0.8
V
- V_DD+0.5
V_hys(NRST)
NRST Schmitt trigger voltage
hysteresis
-
200
-
mV
R_PU
Weak pull-up equivalent resistor⁽²⁾ V_IN V_SS
30
40
50
k
V_F(NRST)(1) NRST Input filtered pulse
-
-
100 ns
V_NF(NRST)(1) NRST Input not filtered pulse
300
-
-
ns
1. Guaranteed by design, not tested in production.
2.
The pull-up is designed with
to the series resistance must be
m^a in^tri^um^eum^{re(s~is1t0a%nceoridnesre)}.^ries
with
a
switchable
PMOS.
This
PMOS
contribution
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