Power On condition for ADN4670

Question

Hi, 
 I need to have all the outputs enabled with ADN4670 on Power-On and later through programming, I want to disable some of the outputs. 
 In the programming section of datasheet it is mentioned that this is possible, provided the inputs EN and SI are left open circuited. 
 But this wont be the the case, since those lines will be connected to a processor. If the processor pins are tristated on Power On, will this work correctly? 
 Also is there any similar device for CMOS clock distribution (1:6 outputs) and enable for each output? 
 Regards, 
 Vishnu

EZAdministrator · Accepted Answer

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RAnslow · Answer

Hi Vishnu, 
 If the micro outputs for EN and SI are tri-state on power-up, the internal pull-down on the ADN4670 should behave the same as if the pins were open-circuit (outputs of the ADN4670 enabled). 
 If additional certainty is wanted, then you can ensure the micro powers up with outputs low for EN and SI on power-on. 
 We have no similar device for 1:6 clock distribution. 
 Regards, 
 Richard Anslow

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Power On condition for ADN4670