Figure 14. Low-Speed External Clock Source Ac Timing Diagram - STMicroelectronics STM32L151CB Manual

Electrical characteristics
Low-speed external user clock generated from an external source
The characteristics given in the following table result from tests performed using a low-
speed external clock source, and under ambient temperature and supply voltage conditions
summarized in
Table 23.
Symbol
f
LSE_ext
V
LSEH
V
LSEL
t
w(LSE)
t
w(LSE)
t
r(LSE)
t
f(LSE)
C
IN(LSE)
DuCy
(LSE)
I
L
1. Guaranteed by design, not tested in production

Figure 14. Low-speed external clock source AC timing diagram

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Table 9.
Low-speed external user clock characteristics
Parameter
User external clock source
frequency
OSC32_IN input pin high level
voltage
OSC32_IN input pin low level
voltage
OSC32_IN high or low time
OSC32_IN rise or fall time
OSC32_IN input capacitance
Duty cycle
OSC32_IN Input leakage current
Doc ID 17659 Rev 6
STM32L151xx, STM32L152xx
(1)
Conditions Min
1
0.7V
DD
V
SS
TBD
TBD
≤ V ≤ V
V
SS IN DD
Typ Max Unit
32.768 1000 kHz
V
DD
V
0.3V
DD
ns
TBD
0.6 pF
TBD %
±1 µA