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STA109X 数据表(PDF) 72 Page - STMicroelectronics |
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STA109X 数据表(HTML) 72 Page - STMicroelectronics |
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72 / 127 page  Electrical Characteristics STA108x, STA109x 72/127 DS13319 Rev 2 4.12 Power On and Reset Timings 4.12.1 Timing Requirements for the Device Power-on Reset The timings to power on the system have been summarized in the table below and represented in Figure 12. Figure 12. Power Supply Possible Start-up Sequences VDD_ON_VREG Supply VDD_ON_VREG Supply VDD Supply VDD_ON Supply and VDD Logic Supply starting at the same time ( =0 limiting case) VDD Logic Supply starting after VDD_ON Supply ( > 0) t V t V VDD Supply >0 3.3V 3.3V [ball E14] [ball E14] 1.2V VDDIO_IO_ON Supply VDDIO_IO_ON Supply 1.2V VDDIO Supply VDDIO Supply PWREN VDDOK VDDOK Earliest VDDOK time Earliest VDDOK time [out] [in] [in] or POWER-UP timeout or POWER-UP timeout |
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