STM32L432KB datasheet(87/149 Pages) STMICROELECTRONICS

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STM32L432KB STM3L432KC

Electrical characteristics

142

6.3.7

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 6.3.14. However,

the recommended clock input waveform is shown in Figure 11: High-speed external clock

source AC timing diagram.

Figure 11. High-speed external clock source AC timing diagram

Table 41. High-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext User external clock source frequency

Voltage scaling

Range 1

-8

MHz

Voltage scaling

Range 2

-8

VHSEH

CK_IN input pin high level voltage

0.7 VDDIOx

-VDDIOx

VHSEL

CK_IN input pin low level voltage

VSS

0.3 VDDIOx

tw(HSEH)

tw(HSEL)

CK_IN high or low time

Voltage scaling

Range 1

Voltage scaling

Range 2

1. Guaranteed by design.

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