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  • TI Thinks Resolved

DS90LV027A: DS90LV027A drop in replacement for DS90LV017A?

Part Number: DS90LV027A

Hello, 

I am looking at specifying alternative components for the TI LVDS driver component: DS90LV017ATMX/NOPB.

The double driver version of this component, DS90LV027A, seems to indicate that if you do not intend to use the second driver then it is recommended to leave these pins unconnected, which is how the current design has these pins. I have not seen any evidence to indicate not using the part if you meet the unconnected pins requirement.

Would this be a recommended approach from a TI perspective?

Thanks,

Diarmuid

  • From the "Interface circuits for TIA/EIA 644 (LVDS) design notes" page 3:

  • Hello,

    Is there a reason for not using DS90LV017A (or DS90LV011A) single driver, if you only need one driver?
    If you want to use only one driver of DS90LV027A, I would recommend tying the D input to ground. The datasheet recommends leaving the differential inputs of the LVDS receiver unconnected.

    Regards,
    Yaser
  • Hi Yaser,

    Thanks for the quick response. The DS90LV017A is currently used in the design but due to stock sensitivity I am looking at alternatives. The DS90LV011A has a different footprint so not an option. Yes you are right it mentions leaving the receiver inputs unconnected, I pasted an excerpt from the LVDS design notes that states the driver input can also be left unconnected. As you recommend tying the D input to ground, would it be unwise to leave it floating?

    Regards,
    Diarmuid
  • In reply to Diarmuid Kearney:

    Hi Diarmuid,

    DS90LV027A doesn't have enable. You can leave the unused input unconnected if you don't think will be too much noise/interference.

    Regards,
    Yaser
  • In reply to Yaser Ibrahim:

    Thanks for your help Yaser.

    Regards,

    Diarmuid

  • In reply to Diarmuid Kearney:

    Hi Diarmuid,

    After looking further into it, I have verified that this device actually does not have a pull down/up on the D input. Sorry about the confusion from the app note you referenced. It is an old app note and doesn't cover all current TI devices.

    Since you are not using that channel, you may still be bale to leave it unconnected, but there is a chance it may bounce around and could potentially interfere with the used channel. So it is recommended to tie it to GND or Vcc.

    Regards,
    Yaser

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