Data Sheet

Design Considerations—Ethernet Controller I210
835
Figure 12-24.External Voltage Regulator Power-up Sequence
12.7.2.2 Power Up-Sequence (Internal SVR)
The I210 controls the power-up sequence internally and automatically with the following conditions
(see Figure 12-25):
• 3.3 Vdc must be the source for the internal LVR.
• 1.5 Vdc never exceeds 3.3 Vdc.
• 0.9 Vdc never exceeds 3.3 Vdc or 1.5 Vdc.
The ramp is delayed internally, with T
delay
depending on the rising slope of the 3.3 Vdc ramp (see Table
11-2).
Figure 12-25.Internal SVR Power-Up Sequence
VDD3p3
VDD1p5
VDD0p9
VDD1p5
VDD0p9
VDD3p3