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there are no strong requirements for power up/down sequence but here are some points which should be followed:
The 5410A CVdd operates at1.5V and DVdd operates at 3.3V.
Both supplies may be powered up/down simultaneously.
If it is impossible to power-up/down the CVdd and DVdd simultaneously, CVdd must be powered up first, DVdd second.
For power-down, DVdd must be powered down first, CVdd second.
Hope this answers your question