STM32H533CE datasheet(120/231 Pages) STMICROELECTRONICS

120 / 231 page

Electrical characteristics

STM32H533xx

120/231

DS14539 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 41. 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).

Table 41. 4-50 MHz HSE oscillator characteristics(1)

Symbol

Parameter

Operating conditions(2)

Min

Typ

Max

Unit

Oscillator frequency

MHz

Feedback resistor

200

kΩ

IDD(HSE) HSE current consumption

During startup(3)

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 4 MHz

-0.44

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 8 MHz

-0.44

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 16 MHz

-0.55

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 32 MHz

-0.67

VDD = 3 V, Rm = 20 Ω,

CL = 10 pF at 48 MHz

-1.17

Gmcritmax Maximum critical crystal gm

Startup

1.5

mA/V

tSU(HSE)(4) Startup time

VDD is stabilized

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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