STM32H7 datasheet(231/357 Pages) STMICROELECTRONICS

Part #	STM32H7

Description	32-bit Arm® Cortex®-M7 480MHz MCUs, up to 2MB flash, up to 1MB RAM, 46 com. and analog interfaces

PDF	357 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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231 / 357 page

DS12110 Rev 10

231/357

STM32H742xI/G STM32H743xI/G

Electrical characteristics (rev V)

320

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 157: I/O static characteristics. However, the

recommended clock input waveform is shown in Figure 72.

Note:

For information on selecting the crystal, refer to the application note AN2867 “Oscillator

design guide for STM8AL/AF/S, STM32 MCUs and MPUs” available from the ST website

www.st.com.

Figure 72. Low-speed external clock source AC timing diagram

Table 140. 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

VLSEL

OSC32_IN input pin low level voltage

VSS

-0.3 VDDIOx

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

250

1. Guaranteed by design.

ai17529b

OSC32_IN

External

STM32

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10 %

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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