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SN74LVC8T245 - power up sequence

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: SN74LVC8T245

Hi all,

Would you mind if we ask SN74LVC8T245?

<Question1>
The sequencing of each power supply will not damage the device during the power up operation(VCCA -> VCCB), right?
Can either power supply be ramped up first, or not?

<Question2>
If the only VccA switch off by some accident but VccB keeps on,  the device is not damaged, is it?

<Question3>
In case of the power up operation, OE pin should connect to VCCA.
Is it NG to connects to OE with GND(in case of the power up operation)?

Kind regards,

Hirotaka Matsumoto 

  • 0
    Guru 27585 points

    Hi team

    We guess that your team is so busy, however could you give us advice?

    Kind regards,

    Hirotaka Matsumoto

  • 0
    TI__Expert 6335 points

    Hirotaka - I am just back from vacation and responding to all of the customers questions that were received.

    Hirotaka Matsumoto said:

    <Question1>
    The sequencing of each power supply will not damage the device during the power up operation(VCCA -> VCCB), right?
    Can either power supply be ramped up first, or not?

    VCCA and VCCB can be powered up in any order without device damage.

    Hirotaka Matsumoto said:

    <Question2>
    If the only VccA switch off by some accident but VccB keeps on,  the device is not damaged, is it?

    Correct. By "switch off", I assume you mean that VCCA is kept at GND. Let me know if my assumption is correct.

    Hirotaka Matsumoto said:

    <Question3>
    In case of the power up operation, OE pin should connect to VCCA.
    Is it NG to connects to OE with GND(in case of the power up operation)?

    In the case of power up operation, you can connect OE to GND without any device damage.

    Best Regards,
    Nirav