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SN74LVC244A: Recommendation to replace the SN74LVC244

Lacey Lin
Intellectual 2900 points
Part Number: SN74LVC244A
Other Parts Discussed in Thread: SN74LVTH125, PCA9306

Hi team,

My customer are using the SN74LVC244 in the board as a live insertion protection.

Now they are looking for a similar part that with smaller package, 4 I/O and can support 3.3V I/O voltage.

I have searched the TI.com and find maybe the SN74LVTH125RGYR can meet the requirement.

So can you help to give your recommendation for the application?

Lacey

Thanks a lot!

  • 0
    TI__Guru* 97046 points
    Hi Lacey,
    You haven't given me any details of your application. What is the load? What is the signal?

    The SN74LVTH125 has bus-hold circuits on each input pin -- is this something they need? Do they use pull-up or pull-down resistors in their system? Bus-hold could cause issues.

    Why not use the SN74LVC244ARWPR? It's 2.5 x 3.3mm, which is even smaller than the SN74LVTH125RGYR (3.5 x 3.5mm) and provides the exact same solution as what they are using today.
  • 0 in reply to Emrys Maier
    TI__Intellectual 2900 points
    Hi Emrys,
    Thanks so much for your reply!
    Because customer just need 4bit I/O, so want to find the device that same function as SN74LVC244 but more smaller.
    So if the 4 bit device also is larger than the 8bit, they will still consider the 8 bit one. But firstly they want to find the 4 bit part.
    The signal is the DC 3.3V, For other information, I need to check with customer.
    So any other information needed except for the load, pull-up or pull-down resistor?

    Lacey
    Thanks a lot!
  • 0 in reply to Lacey Lin
    TI__Guru* 97046 points
    If size is the primary concern, the part I recommended above (SN74LVC244ARWPR) is the absolute smallest option. Once you factor in adding an external bypass capacitor, this is even smaller than going with 4 single bits.

    There is no version of the 244 that only has 4 bits / 12 pins. All 4+ channel logic devices come in 14/16/20/24 pin packages.
  • 0 in reply to Emrys Maier
    TI__Intellectual 2900 points
    Hi Emrys，
    One more question：
    Can SN74LVC244 support I2C signal?
    Lacey
    Thanks a lot!
  • 0 in reply to Lacey Lin
    TI__Guru* 97046 points
    Hi Lacey,
    No, I2C is an open-drain standard and will not work with a push-pull buffer. You would need to contact the I2C team to find a redriver if that's required.

    You can post a question with the part number "PCA9306" to get it to the right forum.