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SPEAR300 bảng dữ liệu(PDF) 55 Page - STMicroelectronics

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SPEAR300 bảng dữ liệu(HTML) 55 Page - STMicroelectronics

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SPEAr300
Electrical characteristics
Doc ID 16324 Rev 2
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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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