Datasheet

Electrical characteristics STM32L072xx
82/149 DocID027100 Rev 4
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 26.
Figure 21. Low-speed external clock source AC timing diagram
Table 44. 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
-
1 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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