STM32U535NET6QTR datasheet(195/278 Pages) STMICROELECTRONICS

195 / 278 page

DS14217 Rev 1

195/278

STM32U535xx

Electrical characteristics

253

Low-speed internal (LSI) RC oscillator

5.3.9

PLL characteristics

The parameters given in the table below are derived from tests performed under

temperature and VDD supply voltage conditions summarized in Table 32.

Table 83. LSI oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSI

LSI frequency

VDD = 3.0 V, TJ = 30 °C, LSIPREDIV = 0

31.4

32.6

kHz

VDD = 3.0 V, TJ = 30 °C, LSIPREDIV = 1 0.245

0.255

1.58 V≤ VDD ≤ 3.6 V, TJ = –40 to 125 °C 30.4(1)

-33.6(1)

DuCy(LSI) LSI duty cycle

LSIPREDIV = 1

tSU(LSI)(2) LSI oscillator startup time

230

260

μs

tSTAB(LSI)(2) LSI oscillator stabilization time 5% of final frequency

230

260

IDD(LSI)(2)

LSI oscillator power

consumption

LSIPREDIV = 0

140

255

LSIPREDIV = 1

130

240

1. Evaluated by characterization. Not tested in production.

2. Specified by design. Not tested in production.

Table 84. PLL characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPLL_IN

PLL input clock

MHz

PLL input clock

duty cycle

-10

fPLL_OUT

PLL P, Q, R

output clock

Voltage scaling range 1

160(2)

MHz

Voltage scaling range 2

110

Voltage scaling range 3

fVCO_OUT PLL VCO output

Voltage scaling range 1, 2

128

544

Voltage scaling range 3

128

330

Duty cycle with division 1

tLOCK(3)(4) PLL lock time

Integer mode

μs

Fractional mode

Jitter

RMS cycle-to-

cycle jitter

Integer mode, VCO = 544 MHz

±ps

Fractional mode, VCO = 544 MHz

RMS period jitter

Integer mode, VCO = 544 MHz

Fractional mode, VCO = 544 MHz

Long-term

jitter(5),

fPLL_IN = 8 MHz

Integer mode, VCO = 544 MHz

160

Fractional mode, VCO = 544 MHz

170

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