STM32H562II datasheet(149/270 Pages) STMICROELECTRONICS

149 / 270 page

DS14258 Rev 5

149/270

STM32H562xx and STM32H563xx

Electrical characteristics

238

Note:

For information on selecting the crystal, refer to AN2867 “Guidelines for oscillator design on

STM8AF/AL/S and STM32 MCUs/MPUs” available from www.st.com.

Figure 28. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 50 MHz crystal/ceramic

resonator oscillator.

All the information given in this paragraph are based on characterization results obtained

with typical external components specified in Table 42. In the application, the resonator and

the load capacitors must be placed as close as possible to the oscillator pins to minimize

output distortion and startup stabilization time. Refer to the crystal resonator manufacturer

for more details on the resonator characteristics (frequency, package, accuracy).

tw(LSEH)/tw(LSEL)

Digital OSC_IN input high

or low time

External digital clock

250

Visw_H

Analog low-swing OSC_IN

high-level voltage

External analog low swing

clock

0.6

1.225

Visw_L

Analog low-swing OSC_IN

low-level voltage

0.35

0.8

ViswLSE

(VLSEH -VLSEL)

Analog low-swing OSC_IN

peak-to-peak amplitude

0.5

0.875

DuCyLSE

Analog low-swing OSC_IN

duty cycle

tr(LSE)/tf(LSE)

Analog low-swing OSC_IN

rise and fall times

External analog low swing

clock, 10% to 90%

100

200

1. Specified by design - Not tested in production.

Table 41. Low-speed external user clock characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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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