STM32F427AI datasheet(95/240 Pages) STMICROELECTRONICS

95 / 240 page

DS9405 Rev 12

95/240

STM32F427xx STM32F429xx

Electrical characteristics

197

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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