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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPEAR300 датащи(PDF) 55 Page - STMicroelectronics |
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SPEAR300 датащи(HTML) 55 Page - STMicroelectronics |
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55 / 83 page  SPEAr300 Electrical characteristics Doc ID 16324 Rev 2 55/83 5.7 Power up sequence It is recommended to power up the power supplies in the order shown in Figure 5. VDD 1.2 is brought up first, followed by VDD 1.8, then VDD 2.5 and finally VDD 3.3. Figure 5. Power-up sequence 5.8 Removing power supplies for power saving It is recommended to remove the the power supplies in the order shown in Figure 6. 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. Table 24. On die termination Symbol Parameter Min Typ Max Unit RT1* Termination value of resistance for on die termination 75 RT2* Termination value of resistance for on die termination 150 Table 25. Reference voltage Symbol Parameter Min Typ Max Unit VREFIN Voltage applied to core/pad 0.49 * VDDE 0.500 * VDDE 0.51 * VDDE V VDD 1.2 VDD1.8 VDD 2.5 VDD 3.3 Power-up sequence |
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