STM32L100RB datasheet(59/103 Pages) STMICROELECTRONICS

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STM32L100C6 STM32L100R8/RB

Electrical characteristics

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 6.3.13. However, the

recommended clock input waveform is shown in Figure 11.

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

Table 25. 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

832

MHz

CSS is off, PLL

not used

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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