STM32F446RC datasheet(79/202 Pages) STMICROELECTRONICS

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STM32F446xC/E

Electrical characteristics

175

Figure 20. External capacitor CEXT

1. Legend: ESR is the equivalent series resistance.

6.3.3

Operating conditions at power-up / power-down (regulator ON)

Subject to general operating conditions for TA.

6.3.4

Operating conditions at power-up / power-down (regulator OFF)

Subject to general operating conditions for TA.

Table 18. VCAP_1/VCAP_2 operating conditions(1)

1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be

replaced by two 100 nF decoupling capacitors.

Symbol

Parameter

Conditions

CEXT

Capacitance of external capacitor

2.2 µF

ESR

ESR of external capacitor

< 2

CEXT

Capacitance of external capacitor with a

single VCAP pin available

4.7 µF

ESR

ESR of external capacitor with a single

VCAP pin available

< 1

Table 19. Operating conditions at power-up/power-down (regulator ON)

Symbol

Parameter

Min

Max

tVDD

VDD rise time rate

∞

VDD fall time rate

∞

Table 20. Operating conditions at power-up / power-down (regulator OFF)(1)

1. To reset the internal logic at power-down, a reset must be applied on pin PA0 when VDD reach below

1.08 V.

Symbol

Parameter

Conditions

Min

Max

Unit

tVDD

VDD rise time rate

Power-up

∞

µs/V

VDD fall time rate

Power-down

∞

tVCAP

VCAP_1 and VCAP_2 rise time rate Power-up

∞

VCAP_1 and VCAP_2 fall time rate

Power-down

∞

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