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SN74CBT3125C: I/O driving capability

Sam Wang1
Prodigy 140 points
Part Number: SN74CBT3125C


Hi

I use the device as test driver and then there's question about "ON-state switch current, II/O ±128mA" for 4 output port sharing.

When only active one output port (ie. 1B ON but 2B/3B/4B OFF),  dose driving current of 1B port  reach 128mA? Or only reach 32mA .

Thanks

  • 0
    TI__Mastermind 35648 points

    Hey Sam,

    I may be misunderstanding what your application here is but it sounds like you're planning on driving current with this device. This is actually the max current that can be driven through an I/O port by another source. This device (and all most other devices in the analog switches and multiplexers portfolio) are going to be passive devices that don't actually drive a current. They will instead steer a signal in the selected path configuration. 

    If you're looking for devices that will actually drive a current and act as a multiplexer take a look at the digital multiplexer : Digital multiplexers & encoders product selection | TI.com

    However, since you're looking at a 1:1 device a buffer may be more of what you're looking for. This will be a device that will take an input and drive an output. These will be located here : Noninverting buffers & drivers product selection | TI.com
    This is a little outside my portfolio and if you have further questions there is a Logic Forum that will be better suited to help you. However, I can point you to the 4 channel buffer & drivers devices that will be most similar to the SN74CBT3125C 

    4chanel buffers

    I hope this helps and let me know if you have any further questions about the analog switches!

    Thanks,
    Rami