STM32F103CBT6 datasheet(52/102 Pages) STMICROELECTRONICS

52 / 102 page

Electrical characteristics

STM32F103x8, STM32F103xB

52/102

Doc ID 13587 Rev 14

Figure 22.

High-speed external clock source AC timing diagram

Figure 23.

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 4 to 16 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).

ai14143

OSC _IN

EXTER NAL

STM32F103xx

CLOCK SOURC E

VHSEH

tf(HSE)

tW(HSE)

90%

10%

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

ai14144b

OSC32_IN

EXTER NAL

STM32F103xx

CLOCK SOURC E

VLSEH

tf(LSE)

tW(LSE)

90%

10%

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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