MM32F103CET datasheet(51/89 Pages) MINDMOTION

51 / 89 page

DS_MM32F103xx_o_Ver1.13

Electrical characteristics

1. Guaranteed by design, not tested in production.

Low-speed external user clock characteristics

The characteristic parameters given in the following table are measured using a low-speed

external clock source, ambient temperature and power supply voltage meet the conditions

of General operating conditions.

Table 19. Low-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext

User external clock source

frequency(1)

32.768

200

KHz

VLSEH

OSC_IN input pin high level

voltage

1.2

VLSEL

OSC_IN input pin low level

voltage

0.25

tw(LSE)

OSC_IN high or low time(1)

15259

tr(LSE)

OSC_IN rise time(1)

tf(LSE)

OSC_IN fall time(1)

Cin(LSE)

OSC_IN input capacitance(1)

DuCy(LSE)

Duty cycle

OSC_IN input leakage current

VSS ≤ VIN ≤ VDD

0.03

1. Guaranteed by design, not tested in production.

474122

External Clock

Source

90%

10%

THSE

tw(HSE)

VHSEH

VHSEL

fHSE_ext

OSC_IN

tw(HSE)

tf(HSE)

tr(HSE)

Figure 14. High-speed external clock source AC timing diagram

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