STM32F407IE datasheet(73/180 Pages) STMICROELECTRONICS

73 / 180 page

STM32F405xx, STM32F407xx

Electrical characteristics

Doc ID 022152 Rev 3

73/180

Table 14.

Limitations depending on the operating power supply range

Operating

power

supply

range

ADC

operation

Maximum

Flash

memory

access

frequency

(fFlashmax)

Number of wait

states at

maximum CPU

frequency(1)

I/O operation

Maximum

FSMC_CLK

frequency for

synchronous

accesses

Possible

Flash

memory

operations

VDD =1.8 to

2.1 V(2)

Conversion

time up to

1.2 Msps

16 MHz with

no Flash

memory wait

state(3)

7(3)(4)

– Degraded

speed

performance

– No I/O

compensation

up to 30 MHz

8-bit erase

and program

operations

only

VDD = 2.1 to

2.4 V

Conversion

time up to

1.2 Msps

18 MHz with

no Flash

memory wait

state

7(4)

– Degraded

speed

performance

– No I/O

compensation

up to 30 MHz

16-bit erase

and program

operations

VDD = 2.4 to

2.7 V

Conversion

time up to

2.4 Msps

24 MHz with

no Flash

memory wait

state

6(4)

– Degraded

speed

performance

– I/O

compensation

works

up to 48 MHz

16-bit erase

and program

operations

VDD = 2.7 to

3.6 V(5)

Conversion

time up to

2.4 Msps

30 MHz with

no Flash

memory wait

state

5(4)

– Full-speed

operation

– I/O

compensation

works

–up to

60 MHz

when VDD =

3.0 to 3.6 V

–up to

48 MHz

when VDD =

2.7 to 3.0 V

32-bit erase

and program

operations

The number of wait states can be reduced by reducing the CPU frequency.

If an inverted reset signal is applied to PDR_ON, this value can be lowered to 1.7 V when the device operates in a reduced

temperature range (0 to 70 °C).

Prefetch is not available. Refer to AN3430 application note for details on how to adjust performance and power.

Thanks to the ART accelerator and the 128-bit Flash memory, the number of wait states given here does not impact the

execution speed from Flash memory since the ART accelerator allows to achieve a performance equivalent to 0 wait state

program execution.

The voltage range for OTG USB FS can drop down to 2.7 V. However it is degraded between 2.7 and 3 V.

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