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STM32L021D4 bảng dữ liệu(PDF) 79 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES
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STM32L021D4 bảng dữ liệu(HTML) 79 Page - STMicroelectronics

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STM32L021x4
Electrical characteristics
93
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 52).
Unless otherwise specified, the parameters given in Table 52 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 17.
Table 52. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)(1) NRST input low level voltage
-
-
-
0.3VDD
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)(1) NRST input not filtered pulse
-
350
-
-
ns
1. Guaranteed by design, not tested in production.
2. 200 mV minimum value
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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