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Connecting common output of analog switch together

Parth Dholakiya
Expert 1245 points
Other Parts Discussed in Thread: TS3A44159, SN74CBTLV3253, SN74CBT3253C, TS5A3359

Hi,

 I want to know what will happen if i connect common output of the 4X SPDT analog switch together to use it as a 4:1 MUX? I want such configuration because i want low Ron resistance with low cost. The multiplexer available with low ON resistance are not fitting in our cost. We require component with cost lest than 0.3USD|1KU AND Ron less that 10ohm. So looking for some good solution.

can i use TS3A44159 part as 4:1 Mux with connecting COM out  together ? How it will affect the system. 

Regards,

  • 0
    TI__Mastermind 45340 points

    Vidula,

    There isn't any issue cascading signal switches together to make 4:1 function out of 3x 2:1 switches.  However when you cascade the switches you will have 2x the parasitic elements of a FET switch like on-state resistance, capacitance, etc.

     

    I searched your requirements on the TI.com switch selection tool.  I used the filters on the left hand side for 4:1 configuration, <10 Ohm Ron, and <$0.30 1ku price which returned 3 results (SN74CBT3253C, SN74CBT3252, and SN74CBTLV3253).  Do these not meet your requirements?

     

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Expert 1245 points

    Hi,

     Thank you very much for your efforts.SN74CBTLV3253 can be used the only issue is it has max 40ohm Ron resistance which may cause offset in our readings. I found another part i.e.TS5A3359 which is 3:1 analog switch which i think i can use. Actually i was unaware of SP3T (3:1) type switches that's why i asked for 4:1 configuration.

    Thank you TI for always helping us.:-)

  • 0 in reply to Parth Dholakiya
    TI__Mastermind 45340 points
    Vidula,

    I'm sorry I didn't fully understand your Ron requirement that it need to be <10 ohms at 85 deg. I didn't know your application operated at this temperature. I'm glad you were able to find better suited 3:1 switch for your application.

    Thank you,
    Adam