STM32L15XRC datasheet(72/136 Pages) STMICROELECTRONICS

tên linh kiện	STM32L15xRC

Giải thích chi tiết về linh kiện	Reset and supply management

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Electrical characteristics

STM32L151xC STM32L152xC

72/136

DocID022799 Rev 12

6.3.6

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.The

external clock signal has to respect the I/O characteristics in Section 6.3.12. However, the

recommended clock input waveform is shown in Figure 15.

Figure 15. High-speed external clock source AC timing diagram

Table 27. High-speed external user clock characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

CSS is on or

PLL is used

MHz

CSS is off, PLL

not used

MHz

VHSEH

OSC_IN input pin high level voltage

0.7VDD

-VDD

VHSEL

OSC_IN input pin low level voltage

VSS

-0.3VDD

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

Cin(HSE)

OSC_IN input capacitance

2.6

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