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multiplexing 2 Sim Cards....

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tariq7868

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Hello, i want to connect 2 sim cards to a GSM module. And wants to select Sim card through microcontroller.i tried using buffer for selecting sim card, but Main problem comes when it come to selection of I/O pin, b/c as it is a bi-directional pin so i cant use 74ls245 b/c it needs the direction of the data to be told...so what should i do ?

100_1301913686.png


attached image is of what i want to do, but i cant think up of transcievers that could be used,....
thanks.

PS: i dont want to use relay, b/c i made need to add 1 or 2 more sim cards, so us of relays wont be feasible.
 
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thanks alot, using 4557f would solve my problem, but unfortunately, this ic isn't available here & would cost a lot to get it shipped. So i am seeking for a cheaper solution like using one of the 74xx series or somthing like this...
 

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