Nrst Pin Characteristics; Table 45. Nrst Pin Characteristics; Figure 18. I/O Ac Characteristics Definition - STMicroelectronics STM32L151RE Manual

Electrical characteristics
6.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, R
Unless otherwise specified, the parameters given in
performed under the conditions summarized in
Symbol Parameter
NRST input low level
(1)
V
IL(NRST)
voltage
NRST input high
(1)
V
IH(NRST)
level voltage
NRST output low
(1)
V
OL(NRST)
level voltage
NRST Schmitt trigger
(1)
V
hys(NRST)
voltage hysteresis
Weak pull-up
R
PU
equivalent resistor
NRST input filtered
(1)
V
F(NRST)
pulse
NRST input not
(3)
V
NF(NRST)
filtered pulse
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%.
92/134

Figure 18. I/O AC characteristics definition

(see Table 45)
PU

Table 45. NRST pin characteristics

Conditions
I
OL
2.7 V < V
I
OL
1.65 V < V
V
(3) IN
DocID025433 Rev 8
Table 45
Table
Min
- -
- 0.39V
DD
= 2 mA
-
< 3.6 V
DD
= 1.5 mA
-
< 2.7 V
DD
- -
V 30
=
SS
- -
- 350
STM32L151xE STM32L152xE
are derived from tests
13.
Typ
- 0.3 V
+0.59 -
-
-
(2)
10%V
DD
45
-
-
Max Unit
DD
-
V
0.4
- mV
60 kΩ
50 ns
- ns