Electrical characteristics
STM32F031x4 STM32F031x6
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DocID025743 Rev 3
Figure 22. I/O AC characteristics definition
6.3.15 NRST
pin
characteristics
The NRST pin input driver uses the CMOS technology. It is connected to a permanent pull-
up resistor, R
PU
.
Unless otherwise specified, the parameters given in the table below are derived from tests
performed under the ambient temperature and supply voltage conditions summarized in
Table 18: General operating conditions
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Table 49. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
IL(NRST)
NRST input low level voltage
-
-
-
0.3 V
DD
+0.07
(1)
V
V
IH(NRST)
NRST input high level voltage
-
0.445 V
DD
+0.398
(1)
-
-
V
hys(NRST)
NRST Schmitt trigger voltage
hysteresis
-
-
200
-
mV
R
PU
Weak pull-up equivalent
resistor
(2)
V
IN
V
SS
25
40
55
k
V
F(NRST)
NRST input filtered pulse
-
-
-
100
(1)
ns
V
NF(NRST)
NRST input not filtered pulse
2.7 < V
DD
< 3.6
300
(3)
-
-
ns
2.0 < V
DD
< 3.6
500
(3)
-
-
1.
Data based on design simulation only. Not tested in production.
2.
The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series
resistance is minimal (~10% order).
3.
Data based on design simulation only. Not tested in production.
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http://www.vicor.top/
021-31660491