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SN74LVC8T245: Power Supply Sequence

Seijiro Matsuoka
Prodigy 720 points
Part Number: SN74LVC8T245


Tool/software:

Dear Team,

As Power Supply Sequence, we recommended that first power-up the input supply rail.

If first power-up the output supply rail, could you please tell me this risk?

Best Regards,

Seijiro Matsuoka

  • +1
    TI__Mastermind 24460 points

    Hello Seijiro,

    The risk is unwanted glitches on the output pins. Let's say VCCB was your output supply. If VCCB is powered first, there is a risk a glitch will be seen on Bx pins. 

    If there is a scenario where your output supply is powered first, I would recommend looking into SN74LXC8T245 instead. The power sequencing circuitry is more robust and supplies can be powered independently without generating a glitch. 

    Regards,

    Josh