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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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SPEAR320 数据表(PDF) 49 Page - STMicroelectronics |
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SPEAR320 数据表(HTML) 49 Page - STMicroelectronics |
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49 / 73 page  SPEAr320 Electrical characteristics Doc ID 16755 Rev 5 49/73 6.8 Removing power supplies for power saving It is recommended to remove the the power supplies in the order shown in Figure 5. So VDD 3.3 supply is to be removed first, then the VDD 2.5 supply, followed by the VDD 1.8 supply and last the VDD 1.2. The minimum time (Δt) between each power down is >0 µs. Figure 5. Power-down sequence 6.9 Power on reset (MRESET) The MRESET must remain active for at least 10 ms after all the power supplies are in the correct range and should become active in no more than 10 µs when one of the power supplies goes out of the correct range. Power-down sequence VDD 1.2 VDD1.8 VDD 2.5 VDD 3.3 t t t |
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