Datasheet

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STM32F427xx STM32F429xx Electrical characteristics
198
6.3 Operating conditions
6.3.1 General operating conditions
Table 17. General operating conditions
Symbol Parameter Conditions
(1)
Min Typ Max Unit
f
HCLK
Internal AHB clock frequency
Power Scale 3 (VOS[1:0] bits in
PWR_CR register = 0x01), Regulator
ON, over-drive OFF
0 - 120
MHz
Power Scale 2 (VOS[1:0] bits
in PWR_CR register = 0x10),
Regulator ON
Over-
drive OFF
0
- 144
Over-
drive ON
- 168
Power Scale 1 (VOS[1:0] bits
in PWR_CR register= 0x11),
Regulator ON
Over-
drive OFF
0
- 168
Over-
drive ON
- 180
f
PCLK1
Internal APB1 clock frequency
Over-drive OFF 0 - 42
Over-drive ON 0 - 45
f
PCLK2
Internal APB2 clock frequency
Over-drive OFF 0 - 84
Over-drive ON 0 - 90
V
DD
Standard operating voltage 1.7
(2)
-3.6
V
V
DDA
(3)(4)
Analog operating voltage
(ADC limited to 1.2 M samples)
Must be the same potential as V
DD
(5)
1.7
(2)
-2.4
Analog operating voltage
(ADC limited to 2.4 M samples)
2.4 - 3.6
V
BAT
Backup operating voltage 1.65 - 3.6
V
12
Regulator ON: 1.2 V internal
voltage on V
CAP_1
/V
CAP_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
V
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
V
CAP_1
/V
CAP_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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