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Cannot understand the working of this. Too much confusion and actual implementation of it.

Category: Hardware
Product Number: ADG732


I am using the two adg732 multiplxers in parralel to achieve a 64:2 multiplexer. What i mean by parallel is that i connect the same control pins to toggle through different channels and use the EN pin to turn 2nd of the mux off upto 32 channels and turn it on for next 32 channels while turning off the first mux. I ground the CS and WR pins of both muxes at all times.However, the EN somehow doesnot work at all like this. I have tried with few of the chips now. 

PS: I am using arduino uno to control the mux and also using A4 of arduino uno as a digital output to control EN pin. Please help asap.