STM32F405 datasheet(99/204 Pages) STMICROELECTRONICS

99 / 204 page

DS8626 Rev 9

99/203

STM32F405xx, STM32F407xx

Electrical characteristics

5.3.8

External clock source characteristics

High-speed external user clock generated from an external source

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

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

summarized in Table 14.

Table 29. Low-power mode wakeup timings

Symbol

Parameter

Min(1)

Typ(1)

Max(1)

Unit

tWUSLEEP(2)

Wakeup from Sleep mode

CPU

clock

cycle

tWUSTOP(2)

Wakeup from Stop mode (regulator in Run mode and

Flash memory in Stop mode)

-13

µs

Wakeup from Stop mode (regulator in low-power mode

and Flash memory in Stop mode)

-17

Wakeup from Stop mode (regulator in Run mode and

Flash memory in Deep power-down mode)

-105

Wakeup from Stop mode (regulator in low-power mode

and Flash memory in Deep power-down mode)

-110

tWUSTDBY(2)(3)

Wakeup from Standby mode

260

375

480

µs

1. Guaranteed by characterization.

2. The wakeup times are measured from the wakeup event to the point in which the application code reads the first instruction.

3. tWUSTDBY minimum and maximum values are given at 105 °C and –45 °C, respectively.

Table 30. 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.

tr(HSE)

tf(HSE)

OSC_IN rise or fall time(1)

Cin(HSE) OSC_IN input capacitance(1)

DuCy(HSE) Duty cycle

OSC_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

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