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SPEAR320S 数据表(PDF) 76 Page - STMicroelectronics |
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SPEAR320S 数据表(HTML) 76 Page - STMicroelectronics |
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76 / 113 page ![]() Electrical characteristics SPEAr320S 76/113 Doc ID 022508 Rev 2 4.9 Power-up sequence It is recommended to power up the power supplies in the order shown in Figure 6. VDD 1.2 is brought up first, followed by VDD 1.8, then VDD 2.5 and finally VDD 3.3. The minimum time ( Δt) between each power up is >0 µs. Figure 6. Power-up sequence 4.10 Power-down sequence All power supplies can be shut down at the same time. VDD 1.2 VDD1.8 VDD 2.5 VDD 3.3 Power-up sequence t t t |
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