STM32MP151AAA3 datasheet(144/245 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32MP151A

144/245

DS12500 Rev 1

6.3.8

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 I/O.

Digital and analog bypass modes are available.

The external clock signal has to respect the Table 48: I/O static characteristics. However,

the recommended clock input waveform is shown in Figure 15 for digital bypass mode and

in Figure 16 for analog bypass mode. In analog bypass mode the clock can be a sinusoidal

waveform.

Figure 15. High-speed external clock source AC timing diagram (digital bypass)

Table 28. High-speed external user clock characteristics (digital bypass)(1)

1. Guaranteed by design.

Symbol

Parameter

Min

Typ

Max

Unit

fHSE_ext

User external clock source frequency

MHz

VSW (VHSEH -VHSEL) OSC_IN amplitude

0.7×VDD

-VDD

VDC

OSC_IN input voltage

VSS

-0.3×VSS

tW(HSE)

OSC_IN high or low time

Table 29. High-speed external user clock characteristics (analog bypass)(1)

Symbol

Parameter

Min

Typ

Max

Unit

fHSE_ext

User external clock source frequency

MHz

duty cycle (Square wave)

duty cycle deterioration

±10(2)

±20(3)

VHSE

Absolute input range

VDD

VPP

OSC_IN peak-to-peak amplitude

0.2(4)

-0.75×VDD

tSU(5)

Time to start

TBD

TBD(6)

µs

ai17528b

OSC_IN

External

STM32

clock source

VHSEH

tf(HSE)

tW(HSE)

90 %

10 %

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

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