Datasheet

Electrical characteristics STM32F401xD STM32F401xE
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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 26 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 37. 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).
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 24). C
L1
and C
L2
are usually the
same size. The crystal manufacturer typically specifies a load capacitance which is the
Table 37. HSE 4-26 MHz oscillator characteristics
(1)
1. Guaranteed by design, not tested in production.
Symbol Parameter Conditions Min Typ Max Unit
f
OSC_IN
Oscillator frequency 4 - 26 MHz
R
F
Feedback resistor - 200 - kΩ
I
DD
HSE current consumption
V
DD
=3.3 V,
ESR= 30 Ω,
C
L
=5 pF @25 MHz
-450-
µA
V
DD
=3.3 V,
ESR= 30 Ω,
C
L
=10 pF @25 MHz
-530-
G
m_crit_max
Maximum critical crystal g
m
Startup - - 1 mA/V
t
SU(HSE)
(2)
2. t
SU(HSE)
is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz
oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly
with the crystal manufacturer
Startup time V
DD
is stabilized - 2 - ms
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