STM32U5A5QJ datasheet(245/382 Pages) STMICROELECTRONICS

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DS13543 Rev 1

245/382

STM32U5Axxx

Electrical characteristics

348

5.3.7

External clock timing characteristics

High-speed external user clock generated from an external source

In bypass mode, the HSE oscillator is switched off and the input pin is a standard GPIO.

The external clock signal has to respect the I/O characteristics in Section 5.3.14: I/O port

characteristics. The recommended clock input waveform is shown in Figure 27.

1. Evaluated by characterization. Not tested in production.

Table 67. Regulator mode transition times(1)

Symbol

Parameter

Conditions

Typ (3 V,

30 °C)

Unit

tLDO(2)

SMPS to LDO transition time

Range 4

15.6

µs

Range 3

14.5

Range 2

14.0

Range 1

13.9

tSMPS(2)

LDO to SMPS transition time

Range 4

13.1

µs

Range 3

16.5

Range 2

16.1

Range 1

15.9

tVOST(3)

Range 4 to range 3

LDO

18.0

SMPS

24.3

Range 3 to range 2

LDO

12.2

SMPS

12.2

Range 2 to range 1

LDO

11.8

SMPS

11.8

Range 4 to range 1

LDO

40.9

SMPS

47.0

1. Evaluated by characterization. Not tested in production.

2. Time to REGS change in PWR_SVMSR.

3. Time to VOSRDY = 1 in PWR_VOSR.

Table 68. Wake-up time using USART/LPUART(1)

Symbol

Parameter

Typ

Max

Unit

tWUUSART

tWULPUART

Wake-up time needed to calculate the maximum USART/LPUART baudrate that

is needed to wake up from Stop mode when the USART/LPUART kernel clock

source is HSI16/MSI.

(2)

μs

1. Specified by design. Not tested in production.

2. This wake-up time is the HSI16 (see Table 73) or the MSI (see Table 74) oscillator maximum startup time.

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