STM32L151XE Datasheet, PDF (92/134 Pages) STMicroelectronics – Ultra-low-power platform

Electrical characteristics
STM32L151xE STM32L152xE
Figure 18. I/O AC characteristics definition






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6.3.14
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, R_PU (see Table 45)
Unless otherwise specified, the parameters given in Table 45 are derived from tests
performed under the conditions summarized in Table 13.
Table 45. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V_IL(NRST)(1)
NRST input low level
voltage
-
-
-
0.3 V_DD
V_IH(NRST)(1)
NRST input high
level voltage
-
0.39V_DD+0.59
-
V_OL(NRST)(1)
NRST output low
level voltage
I_OL = 2 mA
2.7 V < V_DD < 3.6 V
I_OL = 1.5 mA
1.65 V < V_DD < 2.7 V
-
-
-
-
-
V
0.4
V_hys(NRST)(1)
NRST Schmitt trigger
voltage hysteresis
-
-
10%V_DD(2)
-
mV
R_PU
Weak pull-up
equivalent resistor⁽³⁾
V_IN = V_SS
30
45
60
kΩ
V_F(NRST)(1)
NRST input filtered
pulse
-
-
-
50
ns
V_NF(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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