Datasheet

Electrical characteristics STM32H743xI
116/226 DocID030538 Rev 3
6.3.8 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard I/O.
The external clock signal has to respect the Table 58: I/O static characteristics. However,
the recommended clock input waveform
is shown in Figure 16.
Figure 16. High-speed external clock source AC timing diagram
Table 41. High-speed external user clock characteristics
(1)
1. Guaranteed by design.
Symbol Parameter Min Typ Max Unit
f
HSE_ext
User external clock source frequency 4 25 50 MHz
V
SW
(V
HSEH
−V
HSEL)
OSC_IN amplitude 0.7V
DD
-V
DD
V
V
DC
OSC_IN input voltage V
SS
-0.3V
SS
t
W(HSE)
OSC_IN high or low time 7 - - ns
ai17528b
OS C _I N
External
STM32
clock source
V
HSEH
t
f(HSE)
t
W(HSE)
I
L
90 %
10
%
T
HSE
t
t
r(HSE)
t
W(HSE)
f
HSE_ext
V
HSEL
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