Datasheet

Electrical characteristics STM32F446xC/E
102/202 DocID027107 Rev 6
6.3.9 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the
Table 56: I/O static characteristics. However, the
recommended clock input waveform is shown in Figure 23.
The characteristics given in Table 37 result from tests performed using an high-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in
Table 16.
Table 36. Low-power mode wakeup timings
Symbol Parameter Conditions Typ
(1)
Max
(1)
Unit
t
WUSLEEP
(2)
Wakeup from Sleep - 6 6
CPU
clock
cycle
T
WUSLEEPFDSM
(1)
Wakeup from Sleep
with Flash memory in
Deep power down
mode
- 33.5 50
µs
t
WUSTOP
(2)
Wakeup from Stop
mode with MR/LP
regulator in normal
mode
Main regulator is ON 12.8 15
Main regulator is ON and Flash
memory in Deep power down mode
104.9 115
Low power regulator is ON 20.6 28
Low power regulator is ON and
Flash memory in Deep power down
mode
112.8 120
t
WUSTOP
(2)
Wakeup from Stop
mode with MR/LP
regulator in Under-drive
mode
Main regulator in under-drive mode
(Flash memory in Deep power-
down mode)
110 140
Low power regulator in under-drive
mode
(Flash memory in Deep power-
down mode)
114.4 128
t
WUSTDBY
(2)(3)
Wakeup from Standby
mode
- 325 400
1. Guaranteed based on test during characterization.
2. The wakeup times are measured from the wakeup event to the point in which the application code reads the first
instruction.
3. t
WUSTDBY
maximum value is given at –40 °C.
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