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SN74CBTLV3125: 1.8V I2C Signal Consult

Stanley Dai
Expert 5810 points
Part Number: SN74CBTLV3125
Other Parts Discussed in Thread: TMUX1111, TMUX1511

Hi Team,

Customer is consulting whether our SN74CBTLV3125 can support 1.8V I2C signal application? If not, do we have any P2P device to recommend here? Thanks.

I check the D/S the VIH seems tight here regarding to 1.8V.

Best,

Stanley

  • 0
    Guru 316690 points

    As far as I can see, the only similar 1.8 V device is the TMUX1111, which has a different pinout.

  • 0 in reply to Clemens Ladisch
    TI__Expert 5810 points

    Clemens,

    Thanks for reply. Let clarify customer's question here, does A-switch-B can support 1.8V I2C signal for SN74CBTLV3125? For OE control pin, customer will use separate power to control.

    Best,

    Stanley

  • 0 in reply to Stanley Dai
    Guru 316690 points

    The control inputs should use the VCC voltage.

    The switch I/Os are analog, and support any voltage between GND and VCC.

  • 0 in reply to Stanley Dai
    TI__Genius 10974 points

    Hi Stanley,

    You could use the SN74CBTLV3125 here, but you would need to make sure you use a supply voltage between 2.3V and 2.7V and the logic voltage stays above 1.7V (note we guarantee the logic will register a logic high at 1.7V or above, so as long as you are confident your logic signal is 1.8V, there will not be a problem). If you can have separated supplies at those voltages, I see no issue here.

    If you are still a little uncomfortable with using this device, you can also take a look at the TMUX1511 which is basically a refreshed version of this device and will have more margin for operation and better performance (P2P, but note the logic is reversed).

    Thanks!
    Bryan