Datasheet

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STM32L011x3/4 Electrical characteristics
93
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 18.
Figure 20. Low-speed external clock source AC timing diagram
Low-speed external clock generated from a crystal/ceramic resonator
The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 37. In
the application, the resonator and the load capacitors have to be placed as close as
possible to the oscillator pins in order to minimize output distortion and startup stabilization
Table 36. Low-speed external user clock characteristics
(1)
1. Guaranteed by design, not tested in production
Symbol Parameter Conditions Min Typ Max Unit
f
LSE_ext
User external clock source
frequency
-
- 32.768 1000 kHz
V
LSEH
OSC32_IN input pin high level
voltage
0.7V
DD
-V
DD
V
V
LSEL
OSC32_IN input pin low level
voltage
V
SS
-0.3V
DD
t
w(LSE)
t
w(LSE)
OSC32_IN high or low time 465 - -
ns
t
r(LSE)
t
f(LSE)
OSC32_IN rise or fall time - - 10
C
IN(LSE)
OSC32_IN input capacitance - - 0.6 - pF
DuCy
(LSE)
Duty cycle - 45 - 55 %
I
L
OSC32_IN Input leakage current V
SS
≤ V
IN
≤ V
DD
--±1µA
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