SPEAR300-2 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
SPEAR300-2
STMicroelectronics
'SPEAR300-2' PDF : 83 Pages View PDF
SPEAr300
Electrical characteristics
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
VREFIN
Voltage applied to core/pad
Min
0.49 *
VDDE
Typ
Max
0.500 * 0.51 *
VDDE
VDDE
Unit
V
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
Power-up sequence
VDD 1.2
VDD1.8
VDD 2.5
VDD 3.3
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.
Doc ID 16324 Rev 2
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