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SN74LVC2T45: Power Supply Sequencing

KrnB
Intellectual 570 points
Part Number: SN74LVC2T45
Other Parts Discussed in Thread: SN74AXC2T45

Tool/software:

Hello,

SN74LVC2T45's Datasheet says "This device is designed for glitch free power sequencing without any supply sequencing requirements such as ramp order or ramp rate."

I just want to confirm if there is a recommended Power up sequence for SN74LVC2T45DCTR ? I am asking this because a similar part SN74AVCH2T45 has a specific requirement listed below

  • 0
    TI__Mastermind 24970 points

    Hi,

    Please note that glitch free is applicable to the LVC device / datasheet without a specific power up sequence and not the AVC device. You may also see the AXC family (SN74AXC2T45) with a more robust power sequencing than the AVC family, thanks. 

    Best Regards,

    Michael. 

  • 0
    Guru 256060 points

    THe LVC translator can be used with any power sequence.

    The AVC datasheet forbids powering up VCCB before VCCA. This is probably because of the DIR pin, which is powered by VCCA; I'd guess that with an unpowered DIR pin, the B pins might wrongly act as outputs. This will not happen with the LVC.