Nrst Pin Characteristics; Table 49. Nrst Pin Characteristics; Figure 22. I/O Ac Characteristics Definition - STMicroelectronics STM32F031F4 Manual

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Electrical characteristics
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
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
Symbol Parameter
V NRST input low level voltage
IL(NRST)
V NRST input high level voltage
IH(NRST)
NRST Schmitt trigger voltage
V
hys(NRST)
hysteresis
Weak pull-up equivalent
R
(2)
PU
resistor
V NRST input filtered pulse
F(NRST)
V NRST input not filtered pulse
NF(NRST)
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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Figure 22. I/O AC characteristics definition

.
PU
conditions.

Table 49. NRST pin characteristics

Conditions
-
-
-

V
IN
-
2.7 < V
DD
2.0 < V
DD
DocID025743 Rev 3
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Min
-
0.445 V +0.398
DD
-
V 25
SS
-
(3)
< 3.6 300
(3)
< 3.6 500
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STM32F031x4 STM32F031x6
Typ Max
- 0.3 V +0.07
DD
(1)
- -
200 -
40 55
(1)
- 100
- -
- -
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Unit
(1)
V
mV
k
ns
ns