Datasheet

Electrical characteristics STM32F427xx STM32F429xx
100/239 DocID024030 Rev 10
6.3.6 Over-drive switching characteristics
When the over-drive mode switches from enabled to disabled or disabled to enabled, the
system clock is stalled during the internal voltage set-up.
The over-drive switching characteristics are given in Table 23. They are sbject to general
operating conditions for T
A
.
I
RUSH
(1)
InRush current on
voltage regulator power-
on (POR or wakeup
from Standby)
- 160 200 mA
E
RUSH
(1)
InRush energy on
voltage regulator power-
on (POR or wakeup
from Standby)
V
DD
= 1.7 V, T
A
= 105 °C,
I
RUSH
= 171 mA for 31 µs
--5.4µC
1. Guaranteed by design.
2. The reset temporization is measured from the power-on (POR reset or wakeup from V
BAT
) to the instant
when first instruction is read by the user application code.
Table 22. reset and power control block characteristics (continued)
Symbol Parameter Conditions Min Typ Max Unit
Table 23. Over-drive switching characteristics
(1)
1. Guaranteed by design.
Symbol Parameter Conditions Min Typ Max Unit
Tod_swen
Over_drive switch
enable time
HSI - 45 -
µs
HSE max for 4 MHz
and min for 26 MHz
45 - 100
External HSE
50 MHz
- 40 -
Tod_swdis
Over_drive switch
disable time
HSI - 20 -
HSE max for 4 MHz
and min for 26 MHz.
20 - 80
External HSE
50 MHz
- 15 -
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