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SN74CBTLV3245A: Application Usage Consult

Stanley Dai
Expert 5810 points
Part Number: SN74CBTLV3245A

Hi Team,

Customer wants to use our SN74CBTLV3245APWR to isolate the signal between CPU and burner. Original solution is our SN74LVC244APWR, but they found the signal is clamped to "0" when burner programs CPLD code. The device is enabled by default, and cannot be changed. You know SN74LVC244APWR is one-way solution so customer wants to use bi-directional device "SN74CBTLV3245APWR" for solving this.

The CPU states is "high-Z" when burner is working.

Could you pls help review the feasibility of this replacement here? And are there any potential risks for using SN74CBTLV3245APWR here?

Best,

Stanley

  • +1
    Guru 243220 points

    The CBTLV3245 is a passive switch and will solve this problem.

    However, when the 3245 is always enabled, you can simply replace it with eight pieces of wire. If the '244 was needed to increase drive strength, then you cannot replace it with a passive switch. In that case, you should change the board so that the '244's /OE input is controlled from the burner.

  • 0
    TI__Expert 3515 points

    Hi Stanley,

    Clemens is correct, the SN74CBTLV3245A will solve the issue. It is a bi-directional switch that can provide signal isolation when the switch is opened as long as the datasheet abs min/max are not violated. It will not redrive the signal since it is an analog mux that simply passes the input signal to the output.

    Thanks,
    Tyler