Datasheet

DS10198 Rev 8 153/270
STM32L476xx Electrical characteristics
238
6.3.7 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 GPIO.
The external clock signal has to respect the I/O characteristics in Section 6.3.14. However,
the recommended clock input waveform is shown in Figure 23: High-speed external clock
source AC timing diagram.
Table 53. Regulator modes transition times
(1)
Symbol Parameter Conditions Typ Max Unit
t
WULPRUN
Wakeup time from Low-power run mode to
Run mode
(2)
Code run with MSI 2 MHz 5 7
µs
t
VOST
Regulator transition time from Range 2 to
Range 1 or Range 1 to Range 2
(3)
Code run with MSI 24 MHz 20 40
1. Guaranteed by characterization results.
2. Time until REGLPF flag is cleared in PWR_SR2.
3. Time until VOSF flag is cleared in PWR_SR2.
Table 54. Wakeup time using USART/LPUART
(1)
Symbol Parameter Conditions Typ Max Unit
t
WUUSART
t
WULPUART
Wakeup time needed to calculate the
maximum USART/LPUART baudrate
allowing to wakeup up from stop mode
when USART/LPUART clock source is
HSI16
Stop 0 mode - 1.7
µs
Stop 1 mode and Stop 2
mode
-8.5
1. Guaranteed by design.
Table 55. High-speed external user clock characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
HSE_ext
User external clock source frequency
Voltage scaling
Range 1
-848
MHz
Voltage scaling
Range 2
-826
V
HSEH
OSC_IN input pin high level voltage - 0.7 V
DDIOx
-V
DDIOx
V
V
HSEL
OSC_IN input pin low level voltage - V
SS
- 0.3 V
DDIOx
t
w(HSEH)
t
w(HSEL)
OSC_IN high or low time
Voltage scaling
Range 1
7- -
ns
Voltage scaling
Range 2
18 - -
1. Guaranteed by design.
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