STM32L100RB datasheet(60/103 Pages) STMICROELECTRONICS

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Electrical characteristics

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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 12.

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 27. 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 26. Low-speed external user clock characteristics(1)

1. Guaranteed by design.

Symbol

Parameter

Min

Typ

Max

Unit

fLSE_ext

User external clock source frequency

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

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

CIN(LSE)

OSC32_IN input capacitance

0.6

Table 27. HSE oscillator characteristics(1)(2)

Symbol

Parameter

Conditions

Min Typ

Max

Unit

fOSC_IN Oscillator frequency

MHz

Feedback resistor

200

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