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STM32H747AI Datasheet(PDF) 140 Page - STMicroelectronics

No. de pieza STM32H747AI
Descripción Electrónicos  Dual 32-bit Arm® Cortex®-M7 up to 480MHz and -M4 MCUs, up to 2MB Flash, 1MB RAM, 46 com. and analog interfaces, SMPS, DSI
PDF  252 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32H747AI Datasheet(HTML) 140 Page - STMicroelectronics

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Electrical characteristics
STM32H747xI/G
130/242
DS12930 Rev 1
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 71: I/O static characteristics. However, the
recommended clock input waveform is shown in Figure 22.
Note:
For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 22. Low-speed external clock source AC timing diagram
Table 51. Low-speed external user clock characteristics(1)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fLSE_ext User external clock source frequency
-
-
32.768
1000
kHz
VLSEH OSC32_IN input pin high level voltage
-
0.7 VDDIOx
-VDDIOx
V
VLSEL
OSC32_IN input pin low level voltage
-
VSS
-0.3 VDDIOx
tw(LSEH)
tw(LSEL)
OSC32_IN high or low time
-
250
-
-
ns
1. Guaranteed by design.
ai17529b
OSC32_IN
External
STM32
clock source
VLSEH
tf(LSE)
tW(LSE)
IL
90%
10 %
TLSE
t
tr(LSE)
tW(LSE)
fLSE_ext
VLSEL



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