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STM32L082CZ bảng dữ liệu(PDF) 89 Page - STMicroelectronics

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DS10688 Rev 7
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STM32L082xx
Electrical characteristics
109
Figure 23. I/O AC characteristics definition
6.3.14
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU , except when it is internally driven low (see Table 60).
Unless otherwise specified, the parameters given in Table 60 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 23.
Maximum frequency is achieved with a duty cycle at (45 - 55%) when loaded by the
specified capacitance.
T
10%
50%
90%
10%
50%
90%
r(IO)out
t
f(IO)out
t
Table 60. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max Unit
VIL(NRST)(1)
1. Guaranteed by design.
NRST input low level voltage
-
VSS
-0.8
V
VIH(NRST)(1) NRST input high level voltage
-
1.4
-
VDD
VOL(NRST)(1)
NRST output low level
voltage
IOL = 2 mA
2.7 V < VDD < 3.6 V
--
0.4
IOL = 1.5 mA
1.65 V < VDD < 2.7 V
--
Vhys(NRST)(1)
NRST Schmitt trigger voltage
hysteresis
--
10%VDD(2)
2. 200 mV minimum value
-mV
RPU
Weak pull-up equivalent
resistor(3)
3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to
the series resistance is around 10%.
VIN = VSS
25
45
65
k
Ω
VF(NRST)(1) NRST input filtered pulse
-
-
-
50
ns
VNF(NRST)(1) NRST input not filtered pulse
-
350
-
-
ns



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