STM32U545NET3QTR datasheet(191/283 Pages) STMICROELECTRONICS

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DS14216 Rev 1

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STM32U545xx

Electrical characteristics

258

Figure 30. AC timing diagram for low-speed external sinusoidal clock source

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

The high-speed external (HSE) clock can be supplied with a 4 to 48 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on design

simulation results obtained with typical external components specified in the table below.

In the application, the resonator and the load capacitors have to be placed as close as

possible to the oscillator pins, in order to minimize the output distortion and startup

stabilization time. Refer to the crystal resonator manufacturer for more details on the

resonator characteristics (frequency, package, accuracy).

MSv69160V1

VLSE_ext

VLSE_ext_PP

tLSE_ext = 1/fLSE_ext

Table 79. HSE oscillator characteristics(1)

Symbol

Parameter

Conditions(2)

Min

Typ

Max

Unit

fOSC_IN Oscillator frequency

MHz

Feedback resistor

200

kΩ

IDD(HSE)

HSE current

consumption

During startup(3)

μA

VDD = 3 V, Rm = 30 Ω, CL = 10 pF @ 4 MHz

790

VDD = 3 V, Rm = 30 Ω, CL = 10 pF @ 8 MHz

910

VDD = 3 V, Rm = 45 Ω, CL = 10 pF @ 8 MHz

930

VDD = 3 V, Rm = 30 Ω, CL = 5 pF @ 48 MHz

1430

VDD = 3 V, Rm = 30 Ω, CL = 10 pF @ 48 MHz

1960

VDD = 3 V, Rm = 30 Ω, CL = 20 pF @ 48 MHz

3000

Gmcritmax

Maximum critical crystal

transconductance Gm

Startup

1.5

mA/V

tsu(HSE)

(4)

Startup time

VDD stabilized

1. Specified by design. Not tested in production.

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