STM32F415OG datasheet(97/186 Pages) STMICROELECTRONICS

97 / 186 page

DocID022063 Rev 4

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STM32F415xx, STM32F417xx

Electrical characteristics

5.3.8

External clock source characteristics

High-speed external user clock generated from an external source

The characteristics given in Table 29 result from tests performed using an high-speed

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

summarized in Table 14.

Low-speed external user clock generated from an external source

The characteristics given in Table 30 result from tests performed using an low-speed

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

summarized in Table 14.

Table 29. 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)

-5

DuCy(HSE) Duty cycle

OSC_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

Table 30. Low-speed external user clock characteristics

Symbol

Parameter

Conditions

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(LSE)

tf(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)

-5

DuCy(LSE) Duty cycle

OSC32_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

1. Guaranteed by design, not tested in production.

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