STM32F405 datasheet(81/204 Pages) STMICROELECTRONICS

81 / 204 page

DS8626 Rev 9

81/203

STM32F405xx, STM32F407xx

Electrical characteristics

Table 15. Limitations depending on the operating power supply range

Operating

power

supply

range

ADC

operation

Maximum

Flash

memory

access

frequency

with no wait

state

(fFlashmax)

Maximum Flash

memory access

frequency

with wait

states(1) (2)

I/O operation

Clock output

Frequency on

I/O pins

Possible

Flash

memory

operations

VDD =1.8 to

2.1 V(3)

Conversion

time up to

1.2 Msps

20 MHz(4)

160 MHz with 7

wait states

– 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

22 MHz

168 MHz with 7

wait states

– 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

168 MHz with 6

wait states

– 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

168 MHz with 5

wait states

– 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

1. It applies only when code executed from Flash memory access, when code executed from RAM, no wait state is required.

2. 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.

3. VDD/VDDA minimum value of 1.7 V is obtained when the device operates in reduced temperature range, and with the use

of an external power supply supervisor (refer to Section : Internal reset OFF).

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

5. 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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