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SN74LVC157A-Q1

Other Parts Discussed in Thread: SN74LVC157A, SN74LVC1G3157, SN74LVC541A, SN74HCS365, TMUX1248

Hi,
I have two GPS NMEA standard based. The system that receive GPS data required only one GPS data. The other GPS is for spare purposes.
I need to design a simple board that can connect with both GPS and using sliding or toggle switch can connect desire GPS with the system.
It's like wiring connection. The main goal of this PCB is to eliminate the manual connection of desire GPS each time.
I believe, i need a simple MUX 2X1 for this goal but i am not sure. I need help in selecting a simple chip for it. I don't need GPS receiver or anything like that. It is supposed to be very simple circuit to connect desire GPS data with the system.

It will also work if i connect only TX and power wires with the system because RX will be unused in this case all the time.

The second thing, I need to feed single GPS data to 6 devices. It will be 2nd stage of above circuit. It will take data from the selected GPS and then feed it to 6 receivers. In this stage, i need a buffer IC to boost the power of the data so distribute uniformly to all 6 devices.
I was able to feed single GPS data to 4 devices without any issue but i believe, i will need a buffer to feed to 6 devices to keep the power of coming data signal sustain.
Thanks

  • The SN74LVC157A is a buffered mux for digital signals. Such a device is not available with a single channel.

    You can simply use an analog switch like the SN74LVC1G3157.

    To buffer six signals, use a buffer like the SN74LVC541A or SN74HCS365.

  • Hi

    Thanks for your reply.
    I found upgraded version of SN74LVC1G3157(TMUX1248) that is better because of low pin count and provide desire functionality.
    I am only concern about second stage.
    I checked your suggested IC for buffering.
    I need something like DEMUX but without select pins.

    But it seems like each input corresponds to each output on the IC.

    Can you help me with it Plz?
    Thanks

  • Just connect the same signal to all inputs.