STM32F107RC datasheet(46/103 Pages) STMICROELECTRONICS

46 / 103 page

Electrical characteristics

STM32F105xx, STM32F107xx

46/104

Doc ID 15274 Rev 6

Figure 14.

High-speed external clock source AC timing diagram

Figure 15.

Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 3 to 25 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on characterization

results obtained with typical external components specified in Table 22. In the application,

the resonator and the load capacitors have to be placed as close as possible to the oscillator

pins in order to minimize output distortion and startup stabilization time. Refer to the crystal

resonator manufacturer for more details on the resonator characteristics (frequency,

package, accuracy).

ai14127b

OSC _IN

External

STM32F10xxx

clock source

VHSEH

tf(HSE)

tW(HSE)

90%

10%

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

ai14140c

OSC32_IN

External

STM32F10xxx

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10%

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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