STM32F427AI datasheet(94/239 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F427xx STM32F429xx

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DocID024030 Rev 9

6.3

Operating conditions

6.3.1

General operating conditions

Table 17. General operating conditions

Symbol

Parameter

Conditions(1)

Min

Typ

Max

Unit

fHCLK

Internal AHB clock frequency

Power Scale 3 (VOS[1:0] bits in

PWR_CR register = 0x01), Regulator

ON, over-drive OFF

120

MHz

Power Scale 2 (VOS[1:0] bits

in PWR_CR register = 0x10),

Regulator ON

Over-

drive OFF

144

Over-

drive ON

168

Power Scale 1 (VOS[1:0] bits

in PWR_CR register= 0x11),

Regulator ON

Over-

drive OFF

168

Over-

drive ON

180

fPCLK1 Internal APB1 clock frequency

Over-drive OFF

Over-drive ON

fPCLK2 Internal APB2 clock frequency

Over-drive OFF

Over-drive ON

VDD

Standard operating voltage

1.7(2)

-3.6

VDDA

(3)(4)

Analog operating voltage

(ADC limited to 1.2 M samples)

Must be the same potential as VDD(5)

1.7(2)

-2.4

Analog operating voltage

(ADC limited to 2.4 M samples)

2.4

3.6

VBAT

Backup operating voltage

1.65

3.6

V12

Regulator ON: 1.2 V internal

voltage on VCAP_1/VCAP_2 pins

Power Scale 3 ((VOS[1:0] bits in

PWR_CR register = 0x01), 120 MHz

HCLK max frequency

1.08 1.14

1.20

Power Scale 2 ((VOS[1:0] bits in

PWR_CR register = 0x10), 144 MHz

HCLK max frequency with over-drive

OFF or 168 MHz with over-drive ON

1.20 1.26

1.32

Power Scale 1 ((VOS[1:0] bits in

PWR_CR register = 0x11), 168 MHz

HCLK max frequency with over-drive

OFF or 180 MHz with over-drive ON

1.26 1.32

1.40

Regulator OFF: 1.2 V external

voltage must be supplied from

external regulator on

VCAP_1/VCAP_2 pins(6)

Max frequency 120 MHz

1.10 1.14

1.20

Max frequency 144 MHz

1.20 1.26

1.32

Max frequency 168 MHz

1.26 1.32

1.38

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