TXS0108E: No Output from TXS0108E

Tim Teuber

Part Number: TXS0108E

Hi,

i am currently trying to get a TXS0108E on a Breakout-Board to level down a 3.3V based SPI Interface to a 1.4V based SPI Interface.

For this, i connected the 3.3V based Interface to Port B of the Chip, as well as 3.3V to VCCB. I connected the OE Pin to 3.3V over a 1k Pull-Up Resistor and to GND with a 47k Pull-Down Resistor. Currently there is no device connected to the Port A, but i am applying 1.4V to VCCA. When probing the corrosponding pins on Port A with a Oscilloscope, I dont see any signal. There are no external Pull-ups or Pull-Downs on Port A, so just the probe is connected.

Does the OE Pin need to be pulled-up to the VCCA for this operation? I am also probing the Input on Port B and it looks clean.

Best Regards,

Tim

8 months ago

0 Tim Teuber 8 months ago

Intellectual 400 points

Edit: The OE Pin was connected via the Pull-Up to the VCCA of 1.4V and not VCCB with 3.3V. I now switched it, so that its pulled up to VCCB with 3.3V, but i still see no change in Behaivior. I also increased to voltage of VCCA from 1.4 to 1.6 and nothing changed

0 Tim Teuber 8 months ago in reply to Tim Teuber

Intellectual 400 points

okay, i new figured out the chip was probably damaged. I switched out the chip and did exactly wire everything up as before and now it works

0 Jack Guan 8 months ago in reply to Tim Teuber

TI__Guru 61061 points

Hi Tim,

Thanks for updating the inquiry. Please let me know if you have any additional questions.

Regards,

Jack

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TXS0108E: No Output from TXS0108E