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STM32L100RB-A Datasheet(PDF) 61 Page - STMicroelectronics

Part # STM32L100RB-A
Description  Reset and supply management
PDF  102 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L100RB-A Datasheet(HTML) 61 Page - STMicroelectronics

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STM32L100x6/8/B-A
Electrical characteristics
91
Low-speed external user clock generated from an external source
The characteristics given in the following table result from tests performed using a low-
speed external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 14.
Figure 12. Low-speed external clock source AC timing diagram
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 1 to 24 MHz crystal/ceramic
resonator oscillator. All the information given in this paragraph are based on
characterization results obtained with typical external components specified in Table 29. In
the application, the resonator and the load capacitors have to be placed as close as
possible to the oscillator pins in order to minimize output distortion and startup stabilization
time. Refer to the crystal resonator manufacturer for more details on the resonator
characteristics (frequency, package, accuracy).
Table 28. Low-speed external user clock characteristics(1)
1. Guaranteed by design.
Symbol
Parameter
Min
Typ
Max
Unit
fLSE_ext
User external clock source frequency
1
32.768
1000
kHz
VLSEH
OSC32_IN input pin high level voltage
0.7VDD
-VDD
-
VLSEL
OSC32_IN input pin low level voltage
VSS
-0.3VDD
-
tw(LSEH)
tw(LSEL)
OSC32_IN high or low time
465
-
-
ns
tr(LSE)
tf(LSE)
OSC32_IN rise or fall time
-
-
10
CIN(LSE)
OSC32_IN input capacitance
-
0.6
-
pF
Table 29. HSE oscillator characteristics(1)(2)
Symbol
Parameter
Conditions
Min Typ
Max
Unit
fOSC_IN Oscillator frequency
-
1
24
MHz
RF
Feedback resistor
-
200
-
k
Ω



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