STM32F107VB datasheet(44/95 Pages) STMICROELECTRONICS

44 / 95 page

Electrical characteristics

STM32F105xx, STM32F107xx

44/95

Doc ID 15274 Rev 4

5.3.6

External clock source characteristics

High-speed external user clock generated from an external source

The characteristics given in Table 20 result from tests performed using an high-speed

external clock source, and under ambient temperature and supply voltage conditions

summarized in Table 9.

Low-speed external user clock generated from an external source

The characteristics given in Table 21 result from tests performed using an low-speed

external clock source, and under ambient temperature and supply voltage conditions

summarized in Table 9.

Table 20.

High-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

External user clock source

frequency(1)

MHz

VHSEH

OSC_IN input pin high level voltage

0.7VDD

VDD

VHSEL

OSC_IN input pin low level voltage

VSS

0.3VDD

tw(HSE)

OSC_IN high or low time(1)

1. Guaranteed by design, not tested in production.

tr(HSE)

tf(HSE)

OSC_IN rise or fall time(1)

Cin(HSE)

OSC_IN input capacitance(1)

5pF

DuCy(HSE) Duty cycle

OSC_IN Input leakage current

VSS VIN VDD

±1

µA

Table 21.

Low-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext

User External clock source

frequency(1)

1. Guaranteed by design, not tested in production.

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(LSE)

OSC32_IN high or low time(1)

450

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time(1)

Cin(LSE)

OSC32_IN input capacitance(1)

5pF

DuCy(LSE) Duty cycle

OSC32_IN Input leakage current

VSS VIN VDD

±1

µA

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