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CD74HCU04: Die Documentation

Clint Lawton
Prodigy 10 points

Part Number: CD74HCU04

Hi,

I'm looking for any datasheet supplements for a die I have installed with the die marking HCU04E.  The die is greater than 10years old.  I need an appropriately old datasheet.  I'm particularly interested in the type of substrate this die is built on.  Thanks.

  • 0
    TI__Intellectual 2750 points

    Hi Clint,

    The type of substrate used is proprietary information that can not be shared.

    Regards,

    Kollin Ewing 

  • 0 in reply to Kollin Ewing
    Prodigy 10 points

    So if it is proprietary, then can you tell me how to properly hook up to it? I'm guessing it matters whether it is tied to ground or power?

    Thanks,

    Clint

  • 0 in reply to Clint Lawton
    TI__Guru* 98657 points

    Hi Clint,

    Where in the world did you find a 10 year old bare die for HCU04?

    Regardless - the pinout of the device should match up with the pinout of the die -- I'd suggest starting with continuity tests to identify VCC / GND (each pin has a diode to both VCC and GND, and they will be on opposite corners of the die).

    I don't know of any data sheets for bare die - any chance you have details on when it was ordered / where it was procured from, or a label from the box/reel?

  • 0
    Prodigy 10 points

    Good Morning,

    The program using this is a legacy program that made large purchases a long time ago.  I'm currently doing a failure investigation on the card containing this device and an observation was made about the die substrate bonding so i wanted to put that observation to bed.  It does look like the substrate is not expected to be grounded and we have it pulled up to 5V power.  

  • 0 in reply to Clint Lawton
    TI__Guru* 98657 points

    Hey Clint,

    I took a stab at the pinout here. I can't make any guarantees, but it looks to me like the output pins have pretty wide tracks running to them, which is what we'd expect for outputs on a driver like this, and the inputs have narrow tracks running to them. The place I think I'm most likely to be wrong is on VCC / GND - they could be backwards, but I think I have it right b/c the GND pad is connected to a guard ring around the whole die. Hope this helps.