STM32F765XX Datasheet, PDF (142/255 Pages) STMicroelectronics – Dual mode Quad-SPI

Electrical characteristics
STM32F765xx STM32F767xx STM32F768Ax STM32F769xx
Figure 29. Low-speed external clock source AC timing diagram
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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 43. 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).
Symbol
Table 43. HSE 4-26 MHz oscillator characteristics⁽¹⁾
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
ACC_HSE(2) HSE accuracy
V_DD=3.3 V,
ESR= 30 Ω,
- 450 -
C_L=5 pF@25 MHz
μA
V_DD=3.3 V,
ESR= 30 Ω,
- 530 -
C_L=10 pF@25 MHz
à·¥ 500 - 500 ppm
G_m_crit_max Maximum critical crystal g_m
t_SU(HSE(3) Startup time
Startup
-
-
1 mA/V
V_DD is stabilized
-
2
-
ms
1. Guaranteed by design.
2. This parameter depends on the crystal used in the application. The minimum and maximum values must
be respected to comply with USB standard specifications.
3. 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 guaranteed by characterization results. It is measured for a standard
crystal resonator and it can vary significantly with the crystal manufacturer.
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