External Clock Source Characteristics; Table 25. High-Speed External User Clock Characteristics; Figure 10. High-Speed External Clock Source Ac Timing Diagram - STMicroelectronics STM32L100RC Manual

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Electrical characteristics
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, not tested in production.
60/104
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Table 25. 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 10. High-speed external clock source AC timing diagram

DocID024995 Rev 4
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Figure 10.
Conditions
CSS is on or
PLL is used
CSS is off, PLL
not used
-
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STM32L100RC
Section 6.3.12. However, the
(1)
Min Typ Max
1 8 32
0 8 32
0.7V - V
DD DD
V - 0.3V
SS DD
12 - -
- - 20
- 2.6 -
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Unit
MHz
MHz
V
ns
pF