English
Language : 

STM32L041X4 Datasheet, PDF (83/119 Pages) STMicroelectronics – Access line ultra-low-power 32-bit MCU ARM-based Cortex-M0+, up to 32KB Flash, 8KB SRAM, 1KB EEPROM, ADC, AES
◁
STM32L041x4/6
Electrical characteristics
Figure 27. I/O AC characteristics definition






6.3.14
(;7(51$/
287387
21&/
WU ,2 RXW
WI ,2 RXW
7
0D[LPXPIUHTXHQF\LVDFKLHYHGLI WUWI ”  7DQGLIWKHGXW\F\FOHLV  
ZKHQORDGHGE\&/VSHFLILHGLQWKHWDEOH³,2$&FKDUDFWHULVWLFV´

DLG
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 56).
Unless otherwise specified, the parameters given in Table 56 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 20.
Table 56. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max Unit
VIL(NRST)(1) NRST input low level voltage
-
VSS
-
0.8
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
-
IOL = 1.5 mA
1.65 V < VDD < 2.7 V
-
-
V
0.4
-
Vhys(NRST)(1)
NRST Schmitt trigger voltage
hysteresis
-
- 10%VDD(2) - mV
RPU
Weak pull-up equivalent
resistor(3)
VIN = VSS
30
45
60 kΩ
VF(NRST)(1) NRST input filtered pulse
-
-
-
50 ns
VNF(NRST)(1) NRST input not filtered pulse
-
350
-
- ns
1. Guaranteed by design.
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%.
DocID027301 Rev 4
83/119
95
 ▷