Datasheet

DocID027973 Rev 5 79/119
STM32L011x3/4 Electrical characteristics
93
Figure 25. 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, R
PU
, except when it is internally driven low (see Table 53).
Unless otherwise specified, the parameters given in Table 53 are derived from tests
performed under ambient temperature and V
DD
supply voltage conditions summarized in
Table 18.
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Table 53. NRST pin characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
IL(NRST)
(1)
NRST input low level voltage - - - 0.3V
DD
V
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
--
0.4
I
OL
= 1.5 mA
1.65 V < V
DD
< 2.7 V
--
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
25 45 65 kΩ
V
F(NRST)
(1)
NRST input filtered pulse - - - 50 ns
V
NF(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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