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STM32U545NET3QTR Datasheet(PDF) 188 Page - STMicroelectronics |
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STM32U545NET3QTR Datasheet(HTML) 188 Page - STMicroelectronics |
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188 / 283 page  Electrical characteristics STM32U545xx 188/283 DS14216 Rev 1 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. However, the recommended clock input waveform is shown in the figure below. tVOST(3) Range 4 to range 3 LDO 19.0 21.0 µs SMPS 25.0 38.0 Range 3 to range 2 LDO 13.0 15.0 SMPS 13.0 23.0 Range 2 to range 1 LDO 12.0 14.0 SMPS 12.0 17.0 Range 4 to range 1 LDO 42.0 47.0 SMPS 48.0 76.0 1. Evaluated by characterization and not tested in production, unless otherwise specified. 2. Time to REGS change in PWR_SVMSR. 3. Time to VOSRDY = 1 in PWR_VOSR. Table 75. Regulator mode transition times(1) (continued) Symbol Parameter Conditions Typ (3 V, 30 °C) Max (3 V) Unit Table 76. 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 81) or the MSI (see Table 82) oscillator maximum startup time. Table 77. High-speed external user clock characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency - Voltage scaling range 1, 2, 3 4(2) -50 MHz - Voltage scaling range 4 4(2) -25 |
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