Datasheet

Electrical characteristics STM32F303xB STM32F303xC
78/149 DS9118 Rev 14
For C
L1
and C
L2
, it is recommended to use high-quality external ceramic capacitors in the
5
pF to 25 pF range (typ.), designed for high-frequency applications, and selected to match
the requirements of the crystal or resonator (see
Figure 16). C
L1
and C
L2
are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
series combination of C
L1
and C
L2
. PCB and MCU pin capacitance must be included (10 pF
can be used as a rough estimate of the combined pin and board capacitance) when sizing
C
L1
and C
L2
.
Note: For information on selecting the crystal, refer to the application note AN2867 “Oscillator
design guide for ST microcontrollers” available from the ST website www.st.com.
Figure 16. Typical application with an 8 MHz crystal
1. R
EXT
value depends on the crystal characteristics.
MS19876V1
(1)
OSC_IN
OSC_OUT
R
F
Bias
controlled
gain
f
HSE
R
EXT
8 MHz
resonator
Resonator with integrated
capacitors
C
L1
C
L2
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