Datasheet

DS10198 Rev 8 175/270
STM32L476xx Electrical characteristics
238
Figure 30. I/O AC characteristics definition
(1)
1. Refer to Table 72: I/O AC 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
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 23: General operating conditions.
MS32132V2
T
10%
50%
90%
10%
50%
90%
Maximum frequency is achieved if (t + t (≤ 2/3)T and if the duty cycle is (45-55%)
when loaded by the specified capacitance.
r
f
r(IO)out
t
f(IO)out
t
Table 73. NRST pin characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
V
IL(NRST)
NRST input low level
voltage
---0.3V
DDIOx
V
V
IH(NRST)
NRST input high level
voltage
-0.7V
DDIOx
--
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
---70ns
V
NF(NRST)
NRST input not filtered
pulse
1.71 V  V
DD
 3.6 V 350 - - ns
1. Guaranteed by design.
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)
.
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