External Clock Source Characteristics; Table 27. High-Speed External User Clock Characteristics; Figure 12. High-Speed External Clock Source Ac Timing Diagram - STMicroelectronics STM32L162RC Manual

STM32L162VC, STM32L162RC
1. Guaranteed by characterization, unless otherwise specified
6.3.6

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
recommended clock input waveform is shown in
Symbol
f
HSE_ext
V
HSEH
V
HSEL
t
w(HSEH)
t
w(HSEL)
t
r(HSE)
t
f(HSE)
C
in(HSE)
1. Guaranteed by design.

Table 27. High-speed external user clock characteristics

Parameter
User external clock source
frequency
OSC_IN input pin high level voltage
OSC_IN input pin low level voltage
OSC_IN high or low time
OSC_IN rise or fall time
OSC_IN input capacitance

Figure 12. High-speed external clock source AC timing diagram

DocID022881 Rev 10
Section
Figure 12.
Conditions Min
CSS is on or
1
PLL is used
CSS is off, PLL
0
not used
0.7V
DD
V
SS
12
-
-
-
6.3.12. However, the
(1)
Typ Max Unit
8 32 MHz
8 32 MHz
- V
DD
V
- 0.3V
DD
- -
ns
- 20
2.6 - pF
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