STM32F446RC datasheet(102/202 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F446xC/E

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DocID027107 Rev 6

6.3.9

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE oscillator is switched off and the input pin is a standard I/O. The

external clock signal has to respect the Table 56: I/O static characteristics. However, the

recommended clock input waveform is shown in Figure 23.

The characteristics given in Table 37 result from tests performed using an high-speed

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

summarized in Table 16.

Table 36. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ(1)

Max(1)

Unit

tWUSLEEP(2)

Wakeup from Sleep

CPU

clock

cycle

TWUSLEEPFDSM(1)

Wakeup from Sleep

with Flash memory in

Deep power down

mode

33.5

µs

tWUSTOP(2)

Wakeup from Stop

mode with MR/LP

regulator in normal

mode

Main regulator is ON

12.8

Main regulator is ON and Flash

memory in Deep power down mode

104.9

115

Low power regulator is ON

20.6

Low power regulator is ON and

Flash memory in Deep power down

mode

112.8

120

tWUSTOP(2)

Wakeup from Stop

mode with MR/LP

regulator in Under-drive

mode

Main regulator in under-drive mode

(Flash memory in Deep power-

down mode)

110

140

Low power regulator in under-drive

mode

(Flash memory in Deep power-

down mode)

114.4

128

tWUSTDBY(2)(3)

Wakeup from Standby

mode

325

400

1. Guaranteed based on test during 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 maximum value is given at –40 °C.

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