Datasheet

Electrical characteristics STM32F411xC STM32F411xE
82/149 DocID026289 Rev 6
6.3.8 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 53. However, the recommended clock input
waveform is shown in Figure 22.
The characteristics given in Table 35 result from tests performed using an high-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 14.
Table 34. Low-power mode wakeup timings
(1)
Symbol Parameter
Min
(1)
Typ
(1)
Max
(1)
Unit
t
WUSLEEP
(2)
Wakeup from Sleep mode - 4 6
CPU
clock
cycle
t
WUSTOP
(2)
Wakeup from Stop mode, usage of main regulator - 13.5 14.5
µs
Wakeup from Stop mode, usage of main regulator, Flash
memory in Deep power down mode
-105111
Wakeup from Stop mode, regulator in low power mode - 21 33
Wakeup from Stop mode, regulator in low power mode,
Flash memory in Deep power down mode
- 113 130
t
WUSTDBY
(2)(3)
Wakeup from Standby mode - 314 407 µs
t
WUFLASH
Wakeup of Flash from Flash_Stop mode - - 8
µs
Wakeup of Flash from Flash Deep power down mode - - 100
1. Guaranteed by characterization results.
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.
Table 35. High-speed external user clock characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
HSE_ext
External user clock source frequency
(1)
-
1-50MHz
V
HSEH
OSC_IN input pin high level voltage 0.7V
DD
-V
DD
V
V
HSEL
OSC_IN input pin low level voltage V
SS
-0.3V
DD
t
w(HSEH)
t
w(HSEL)
OSC_IN high or low time
(1)
5--
ns
t
r(HSE)
t
f(HSE)
OSC_IN rise or fall time
(1)
--10
C
in(HSE)
OSC_IN input capacitance
(1)
--5-pF
DuCy
(HSE)
Duty cycle - 45 - 55 %
I
L
OSC_IN Input leakage current V
SS
≤ V
IN
≤ V
DD
--±1µA
1. Guaranteed by design.
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.