STM32G070CB datasheet(52/93 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32G070CB/KB/RB

52/93

DS12766 Rev 2

5.3.7

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 5.3.14. See

Figure 11 for recommended clock input waveform.

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

Table 32. Regulator mode transition times(1)

Symbol

Parameter

Conditions

Typ

Max

Unit

tVOST

Transition times between regulator

Range 1 and Range 2(2)

HSISYS = HSI16

µs

1. Based on characterization results, not tested in production.

2. Time until VOSF flag is cleared in PWR_SR2.

Table 33. 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

OSC_IN input pin high level voltage

0.7 VDDIO1

-VDDIO1

VHSEL

OSC_IN input pin low level voltage

VSS

-0.3 VDDIO1

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

Voltage scaling

Range 1

Voltage scaling

Range 2

1. Guaranteed by design.

MS19214V2

VHSEH

tf(HSE)

90%

10%

THSE

tr(HSE)

VHSEL

tw(HSEH)

tw(HSEL)

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