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STM32L053C6 bảng dữ liệu(PDF) 90 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, up to 64KB Flash, 8KB SRAM, 2KB EEPROM, LCD, USB, ADC, DAC
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STM32L053C6 bảng dữ liệu(HTML) 90 Page - STMicroelectronics

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Electrical characteristics
STM32L053x6 STM32L053x8
90/136
DS10152 Rev 9
Figure 24. 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 61).
Unless otherwise specified, the parameters given in Table 61 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 24.
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 61. 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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