STM32H7 datasheet(124/357 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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124 / 357 page

Electrical characteristics (rev Y)

STM32H742xI/G STM32H743xI/G

124/357

DS12110 Rev 10

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 60: I/O static characteristics. However,

the recommended clock input waveform is shown in Figure 18.

Figure 18. High-speed external clock source AC timing diagram

Table 42. High-speed external user clock characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Min

Typ

Max

Unit

fHSE_ext

User external clock source frequency

MHz

VHSEH

Digital OSC_IN input high-level

voltage

0.7 VDD

-VDD

VHSEL

Digital OSC_IN input low-level voltage

VSS

-0.3 VDD

tW(HSE)

OSC_IN high or low time

ai17528b

OSC_IN

External

STM32

clock source

VHSEH

tf(HSE)

tW(HSE)

90 %

10 %

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

STM32H7 Datasheet(PDF) 124 Page - STMicroelectronics

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