STM32H523CCU6 datasheet(116/228 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32H523xx

116/228

DS14540 Rev 1

Note:

For information on selecting the crystal, refer to AN2867 “Oscillator design guide for ST

microcontrollers” available from www.st.com.

Figure 17. 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 40. 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 39. 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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