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SN74LVC16245A: I can't use 8 bits.

R.Fukunaga
Expert 2675 points
Part Number: SN74LVC16245A


Tool/software:

Hi all,

When using 8 bits each, I think each group can operate independently.
If I don't assert both 1OE and 2OE, I can't use 8 bits.
I can access 16 bits without any problem.

Also, a similar circuit configuration on a separate board works independently for each 8 bits without any problem.

1) Have there been similar cases in the past?
2) Is it possible that the OE pin is short circuited? Is it possible that it is in a state like this?
3) Is it possible that the peripheral circuit is affected?
We are aware that pull-up resistor connection is recommended.
However, we think that pull-up is unlikely to be the direct cause because it is stable when the power is turned on.

Best Regards,

Ryusuke

  • 0
    TI__Genius 14691 points

    HI Ryusuke,

    Do you have any example waveforms showing the OE Low the DIR pin input, and an Input not transmitting to an Output? That can help me decide if this part is potentially damaged, or if there is another solution.

    R.Fukunaga said:
    1) Have there been similar cases in the past?

    Not that I have heard, or seen while looking for this type of error.

    R.Fukunaga said:
    2) Is it possible that the OE pin is short circuited? Is it possible that it is in a state like this?

    It is possible, if the device is damaged, to short two pins together although the placement of these OE pins makes it harder to short them together than in smaller devices.

    R.Fukunaga said:
    3) Is it possible that the peripheral circuit is affected?

    I'm unsure what you mean by this.

    These two circuits should be operating independently of each other, so the fact they are interacting is very concerning. Is it possible to swap this device to the board where it's behaving correctly, and observe if the failure follows it?

    Regards,
    Owen