STM32F070CB datasheet(46/83 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F070CB/RB/C6/F6

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DocID027114 Rev 3

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 29. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ @VDD =

VDDA

Max Unit

= 3.3 V

tWUSTOP

Wakeup from Stop mode

Regulator in run mode

2.8

µs

tWUSTANDBY Wakeup from Standby mode

tWUSLEEP

Wakeup from Sleep mode

4 SYSCLK

cycles

Table 30. High-speed external user clock characteristics

Symbol

Parameter(1)

1. Guaranteed by design, not tested in production.

Min

Typ

Max

Unit

fHSE_ext User external clock source frequency

MHz

VHSEH

OSC_IN input pin high level voltage

0.7 VDDIOx

-VDDIOx

VHSEL

OSC_IN input pin low level voltage

VSS

0.3 VDDIOx

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

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