Datasheet

Electrical characteristics STM32F413xG/H
108/208 DocID029162 Rev 6
summarized in Table 17.
Low-speed external user clock generated from an external source
In bypass mode the LSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the
Table 59. However, the recommended clock input
waveform is shown in Figure 28.
The characteristics given in Table 42 result from tests performed using an low-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in
Table 17.
Table 41. High-speed external user clock characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
HSE_ext
External user clock source
frequency
(1)
1. Guaranteed by design.
1-50MHz
V
HSEH
OSC_IN input pin high level voltage 0.7V
DD
-V
DD
V
V
HSEL
OSC_IN input pin low level voltage V
SS
-0.3V
DD
t
w(HSE)
t
w(HSE)
OSC_IN high or low time
(1)
5--
ns
t
r(HSE)
t
f(HSE)
OSC_IN rise or fall time
(1)
--10
C
in(HSE)
OSC_IN input capacitance
(1)
-5-pF
DuCy
(HSE)
Duty cycle 45 - 55 %
I
L
OSC_IN Input leakage current V
SS
≤ V
IN
≤ V
DD
--±1µA
Table 42. Low-speed external user clock characteristics
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
f(LSE)
OSC32_IN high or low time
(1)
450 - -
ns
t
r(LSE)
t
f(LSE)
OSC32_IN rise or fall time
(1)
--50
C
in(LSE)
OSC32_IN input capacitance
(1)
-5-pF
DuCy
(LSE)
Duty cycle 30 - 70 %
I
L
OSC32_IN Input leakage current V
SS
≤ V
IN
≤ V
DD
--±1µA
1. Guaranteed by design.
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