SN74LVCH8T245: SN74LVCH8T245 Power on issue

user4206199

Part Number: SN74LVCH8T245

Dear

Below is customer SCH,VCCB is power on before VCCA,we can find a pulse at endpoint of B as below picture,it can damage behand IGBT，pls help check it

over 5 years ago

0 Emrys Maier over 5 years ago

TI__Guru* 96591 points

Hello,
I have notified our translation expert to take a look. He will get back to you tomorrow.

0 ShreyasRao over 5 years ago

TI__Guru 55970 points

Hi,

Is there a way to capture the plot with Vcca leading Vccb to see if there is a glitch?
With Vcca not powered, the DIR pin will be floating at that point since it is referred to Vcca. Also, there is no defined voltage node at the IO ports when powered up. is it possible to have weak pulldown on B ports as well(100k), and capture the scope shot again.

0 ShreyasRao over 5 years ago in reply to ShreyasRao

TI__Guru 55970 points

Hi,
Any update on this issue or progress on the debug?

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SN74LVCH8T245: SN74LVCH8T245 Power on issue