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TMUX1574: RMII/ NCSI MUXING

Abhi_E
Prodigy 20 points
Part Number: TMUX1574
Other Parts Discussed in Thread: TMUX646, TMUX121, TMUX136, TMUX131

Tool/software:

Looking for 1:2 SPDT Analog MUX for RMII/NC-SI (7 signals, 100Mbps) so 8Ch would be fine. 

Thought of using 2 Qty of TMUX1574 ( 4ch SPDT).

Recommend if any better one is available interms of capacitance, bandwidth, footprint

  • 0
    TI__Mastermind 28308 points

    Hey Abhi,

    We won't have another 2:1 device that support over 8channels besides the TMUX646 which may be a bit overkill but it would support 10channels and up to 6GHz (likely well more than you need). Would also come in a BGA package, so depending on the footprint concerns could be good but obviously bga can have a little extra complications to work with from a soldering perspective.

    2xTMUX1574 would be the next best option though, so if TMUX646 doesn't seem right, I'd stick with the 1574's.

  • 0 in reply to Rami Mooti1
    Prodigy 20 points

    Thanks for suggestion. Yes TMUX646 may overkill considering BW, but the input capacitance of 1.5pF is pretty good vs TMUX1574's 7.5pF.

    Any other MUX in UQFN or similar packages with similar to TMUX646 specifications? 

    TMUX646 is available in BGA only.

    The signals will go thru connectors and long traces on mother board, so trying to search for low capacitance MUX as much as possible.

  • 0 in reply to Abhi_E
    TI__Mastermind 28308 points

    Hey Abhi,

    We do have some QFN's in the TMUX131, TMUX136 and TMUX121 that are all <2pF. However those would all be 2ch devices (131 is a 3:1, 136 and 121 are 2:1) so you would need a few of them to get to 8 channels. If that's okay with you then those would be fine options. I just went with TMUX1574 since it sort of felt like a good balance between less devices/complexity while still maintaining a pretty low CON. Depending on which trade-off you care most about would really drive which device is the best option.

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 20 points

    Rami,

    Thank you so much for summary of all the parts. will save TMUX131, TMUX136 and TMUX121 for future applications may be for i3c kind of use cases. Will go with TMUX1574, i am using the same part for QSPI on same board, that makes my BOM also one less row. 

    Thanks again for the information