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TS3A5017-Q1: Need 2 channel SPI MUX with driver capability

Paul Yeh
Genius 13605 points
Part Number: TS3A5017-Q1
Other Parts Discussed in Thread: TMUX1309-Q1, SN74LVC125A-Q1, SN74LVC126A-Q1

Hi Team,

My customer need 2 channel SPI MUX to control two SPI flash.

But due to their MCU driver capability is small, so they ask MUX+buffer capability, could you advise?

Thanks

  • 0
    TI__Mastermind 43295 points

    Hi Paul,

    Unfortunately analog multiplexers, like the TS3A5017-Q1 - do not have drive abilities. We make passive switches which essentially are just the logic and FET switch. At this time we don't offer a combined buffer / Mux solution.

    However parts like the TS3A5017-Q1 or the TMUX1309-Q1 can still be used as the switch in the system they just require an external buffer. I am not a Buffer expert, but we do have a few choices located here as well, and if you have any more questions I am sure the people on buffer questions on E2E will be sure to help you out!

    Best,

    Parker Dodson

  • 0
    Guru 243180 points

    One input and two outputs per channel? Should the unselected outputs be Hi-Z, or driven low, or high?

  • 0 in reply to Clemens Ladisch
    TI__Genius 13605 points

    Parker,

    I draw one block diagram to explain what customer needs. as for unselected output config. customer doesn't have opinion.

    The most important for them is big driver capability necessary.

    Thanks

  • 0 in reply to Paul Yeh
    Guru 243180 points

    So the two "EP" things are SPI masters, and the flash is the slave? This would imply three signals (clock, MOSI, chip select) from the master to the slave, and one signal (MISO) from the slave to the master. Or are you using another form of SPI?

    Is the flash chip's driver capability large enough, or do you also need a buffer for the MISO line?

    What voltage? 3.3 V? And -Q1 is required?

    It might be possible to combine a SN74LVC125A-Q1 and a SN74LVC126A-Q1; will all OE pins controlled by the same signal, only one chip's outputs will be enabled.

  • 0 in reply to Paul Yeh
    TI__Mastermind 43295 points

    Hi Paul,

    As Clemens mentioned there are some buffered parts that may work. However our generic Multiplexer portfolio does not have any IC's that have drive ability - they are passive FET. 

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Genius 13605 points

    Parker,

    Thanks for advise and I knew it and already suggested customer to use buffer IC as Clemens' suggested.

    Thanks