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STM32F334C8U6TR bảng dữ liệu(PDF) 81 Page - STMicroelectronics

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STM32F334C8U6TR bảng dữ liệu(HTML) 81 Page - STMicroelectronics

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STM32F334x4 STM32F334x6 STM32F334x8
Electrical characteristics
103
Figure 24. I/O AC characteristics definition
6.3.15
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 50).
Unless otherwise specified, the parameters given in Table 53 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 19.
4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the RM0364 reference manual for a description of FM+
I/O mode configuration.
ai14131d
10%
90%
50%
tr(IO)out
OUTPUT
EXTERNAL
ON CL
Maximum frequency is achieved if (tr + tf) ≤ (2/3)T and if the duty cycle is (45-55%)
when loaded by CL specified in the table “
I/O AC characteristics”.
10%
50%
90%
T
tf(IO)out
Table 53. NRST pin characteristics
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
VIL(NRST)(1) NRST Input low level voltage
-
-
-
0.3VDD
+ 0.07(1)
V
VIH(NRST)(1) NRST Input high-level voltage
-
0.445VDD +
0.398(1)
--
Vhys(NRST) NRST Schmitt trigger voltage hysteresis
-
-
200
-
mV
RPU
Weak pull-up equivalent resistor(2)
VIN = VSS
25
40
55
k
Ω
VF(NRST)(1) NRST Input filtered pulse
-
-
-
100(1)
ns
VNF(NRST)(1) NRST Input not filtered pulse
-
500(1)
--
ns
1. Guaranteed by design, 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 must be minimum
(~10% order)
.



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