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STM32L151XE bảng dữ liệu(PDF) 93 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Ultra-low-power 32-bit MCU Arm®-based Cortex®-M3 with 512KB Flash, 80KB SRAM, 16KB EEPROM, LCD, USB, ADC, DAC
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STM32L151XE bảng dữ liệu(HTML) 93 Page - STMicroelectronics

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DS10002 Rev 10
93/136
STM32L151xE STM32L152xE
Electrical characteristics
114
Figure 18. 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 (see Table 45)
Unless otherwise specified, the parameters given in Table 45 are derived from tests
performed under the conditions summarized in Table 13.
ai14131c
10%
90%
50%
tr(IO)out
OUTPUT
EXTERNAL
ON 50pF
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
10%
50%
90%
when loaded by 50pF
T
tf(IO)out
Table 45. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)(1)
NRST input low level
voltage
--
-
0.3 VDD
V
VIH(NRST)(1)
NRST input high
level voltage
-
0.39VDD+0.59
-
-
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)
-mV
RPU
Weak pull-up
equivalent resistor(3)
VIN = VSS
25
45
65
k
Ω
VF(NRST)(1)
NRST input filtered
pulse
--
-
50
ns
VNF(NRST)(3)
NRST input not
filtered pulse
-
350
-
-
ns
1. Guaranteed by design.
2. With a minimum of 200 mV.
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%.



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