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75LVT1624 bus hold

Timothy Starr
Expert 2445 points
Other Parts Discussed in Thread: SN74LVT16245A

I have a 75LVT1624 part in my design that ha s the bus-hold feature in the part, so data sheet says resistors for pull-up or pull down are not recommended. If one does put a 10K pull-up or 1K pull down does it harm the part or effect it’s long term relaibility?

The pull ups/downs are on the inputs, but since the part is bi-directional, they can become outputs.

During power-up does the part end up in deterministic state on the I/O because of the buss-hold feature or is the state random?

Thanks and Best Regards,,

-Tim Starr on behalf of MG@DE

  • 0
    TI__Guru 71526 points

    First, the part number is incomplete. Not sure if you are using SN74LVT16244, SN74LVT16244A, or SN74LVT16245, although for the query, it doesn't really matter.  Additionally, these devices are obsolete, so I'm not understanding why the query in the first place?

    However, an active device, the SN74LVT16245A:  does have bushold feature plus PUS3.  Pullups are not recommended, as they interfere with the bushold and PUS3 featues, but will not harm the device. Please read this App Note on PU3S: http://www.ti.com/litv/pdf/szza033 , and this one on Bushold: http://www.ti.com/litv/pdf/szza036b (see pg 21-22 for a good discussion, plus pg 50)  .

    Since pullups are not recommended, I'm not understanding why you would be designing pullups into a product using the SN74LVT16245A?

    -Leonard