STM32F479II datasheet(91/208 Pages) STMICROELECTRONICS

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STM32F479xx

Electrical characteristics

187

5.3.2

VCAP1/VCAP2 external capacitor

Stabilization for the main regulator is achieved by connecting an external capacitor CEXT to

the VCAP1/VCAP2 pins. CEXT is specified in Table 19.

Figure 24. External capacitor CEXT

1. Legend: ESR is the equivalent series resistance.

Table 18. Limitations depending on the operating power supply range

Operating

power

supply range

ADC

operation

Maximum Flash

memory access

frequency with

no wait states

(fFlashmax)

Maximum HCLK

frequency

vs.

Flash memory wait

states (1)(2)

I/O operation

Possible Flash

memory

operations

VDD =

1.7 to 2.1 V(3)

Conversion time

up to 1.2 Msps

20 MHz(4)

168 MHz

with 8 wait states

and over-drive OFF

No I/O

compensation

8-bit erase

and program

operations only

VDD =

2.1 to 2.4 V

22 MHz

180 MHz

with 8 wait states

and over-drive ON

16-bit erase

and program

operations

VDD =

2.4 to 2.7 V

Conversion time

up to 2.4 Msps

24 MHz

180 MHz

with 7 wait states

and over-drive ON

I/O compensation

works

16-bit erase

and program

operations

VDD =

2.7 to 3.6 V(5)

30 MHz

180 MHz

with 5 wait states

and over-drive ON

32-bit erase

and program

operations

1. Applicable only when the code is executed from Flash memory. When the code is 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 with the use of an external power supply supervisor (refer to Section 2.19.2).

4. Prefetch is not available.

5. When VDDUSB is connected to VDD, the voltage range for USB full speed PHYs can drop down to 2.7 V. However the

electrical characteristics of D- and D+ pins will be degraded between 2.7 and 3 V.

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