STM32L471VG datasheet(131/218 Pages) STMICROELECTRONICS

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STM32L471xx

Electrical characteristics

199

Low-speed internal (LSI) RC oscillator

6.3.9

PLL characteristics

The parameters given in Table 50 are derived from tests performed under temperature and

VDD supply voltage conditions summarized in Table 22: General operating conditions.

Table 49. LSI oscillator characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fLSI

LSI Frequency

VDD = 3.0 V, TA = 30 °C

31.04

32.96

kHz

VDD = 1.62 to 3.6 V, TA = -40 to 125 °C

29.5

tSU(LSI)(2)

LSI oscillator start-

up time

130

μs

tSTAB(LSI)(2)

LSI oscillator

stabilization time

5% of final frequency

125

180

μs

IDD(LSI)(2)

LSI oscillator power

consumption

110

180

1. Guaranteed by characterization results.

2. Guaranteed by design.

Table 50. PLL, PLLSAI1, PLLSAI2 characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fPLL_IN

PLL input clock(2)

-4

MHz

PLL input clock duty cycle

fPLL_P_OUT PLL multiplier output clock P

Voltage scaling Range 1

2.0645

MHz

Voltage scaling Range 2

2.0645

fPLL_Q_OUT PLL multiplier output clock Q

Voltage scaling Range 1

MHz

Voltage scaling Range 2

fPLL_R_OUT PLL multiplier output clock R

Voltage scaling Range 1

MHz

Voltage scaling Range 2

fVCO_OUT PLL VCO output

Voltage scaling Range 1

344

MHz

Voltage scaling Range 2

128

tLOCK

PLL lock time

μs

Jitter

RMS cycle-to-cycle jitter

System clock 80 MHz

-40

±ps

RMS period jitter

IDD(PLL)

PLL power consumption on

VDD(1)

VCO freq = 64 MHz

150

200

μA

VCO freq = 96 MHz

200

260

VCO freq = 192 MHz

300

380

VCO freq = 344 MHz

520

650

1. Guaranteed by design.

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