Datasheet

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STM32L432KB STM32L432KC Electrical characteristics
147
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 11: High-speed external clock
source AC timing diagram.
Figure 11. High-speed external clock source AC timing diagram
Table 42. 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
CK_IN input pin high level voltage - 0.7 V
DDIOx
-V
DDIOx
V
V
HSEL
CK_IN input pin low level voltage - V
SS
- 0.3 V
DDIOx
t
w(HSEH)
t
w(HSEL)
CK_IN high or low time
Voltage scaling
Range 1
7- -
ns
Voltage scaling
Range 2
18 - -
1. Guaranteed by design.
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