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OPA211 , OPA2211, OPA2111 / power on sequence of Positive Power Supply and Negative Power Supply

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Hello,
 
Could you please let me know the power on sequece of V+/V- power supply for OPA211, OPA2211 and OPA2111?
 
My customer use these device by +/-10V ~ +/-15V.
And in thier system, negative supply is turned on at first.
 
Are there any restriction of power on sequence of V+ / V-?
 
for example,,,
  At the Same time ?
  No restriction?
  No restriction within 30ms ? etc.
 
Best Regards,
Ryuji Asaka     

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