Datasheet

Electrical characteristics STM32L010F4/K4
56/91 DS12323 Rev 2
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 15.
Figure 15. Low-speed external clock source AC timing diagram
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 1 to 25 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 34. 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 33. 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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