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STM32L152CBT6 Datasheet, PDF (82/121 Pages) STMicroelectronics – Ultra-low-power 32-bit MCU ARM-based Cortex-M3
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Electrical characteristics
STM32L151x6/8/B, STM32L152x6/8/B
Figure 18. I/O AC characteristics definition
6.3.13
External
Output
on 50pF
90 %
50%
10%
tr( I O)out
10%
50 %
90 %
tf(I O)out
T
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
when loaded by 50 pF
ai14131b
NRST pin characteristics
The NRST pin input driver uses CMOS technology.
Unless otherwise specified, the parameters given in Table 45 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 14.
Table 45. NRST pin characteristics
Symbol
Parameter
Conditions
Min Typ Max Unit
VIL(NRST)(1) NRST input low level voltage
VIH(NRST)(1) NRST input high level voltage
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
Vhys(NRST)(1)
NRST Schmitt trigger voltage
hysteresis
VSS
1.4
10%VDD(2)
0.8
VDD
V
0.4
mV
RPU
Weak pull-up equivalent
resistor(3)
VIN = VSS
30
45 60 kΩ
VF(NRST)(1) NRST input filtered pulse
VNF(NRST)(1) NRST input not filtered pulse
50 ns
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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