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SPEAR320 数据表(PDF) 48 Page - STMicroelectronics |
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SPEAR320 数据表(HTML) 48 Page - STMicroelectronics |
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48 / 73 page ![]() Electrical characteristics SPEAr320 48/73 Doc ID 16755 Rev 5 6.7 Power up sequence It is recommended to power up the power supplies in the order shown in Figure 4. 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 4. Power-up sequence Table 25. On die termination Symbol Parameter Min Typ Max Unit RT1 Termination value of resistance for on die termination 75 Ω RT2 Termination value of resistance for on die termination 150 Ω Table 26. 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 t t t |
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