TXB0106: A to B can work , but B to A can't work

Haiwen Huang

Part Number: TXB0106

Dears:

When configure A as output, TXB0106 can work well. But configure A as input, TXB0106 can't work . A and B both pull down. Could you please help check it ? Thanks.

4 months ago

0 Clemens Ladisch 4 months ago

Guru 267530 points

What are the voltages at the A and B pins?

0 Haiwen Huang 4 months ago in reply to Clemens Ladisch

TI__Intellectual 1620 points

Clemens:

it's showing in the picture. VCCA=1.8V, VCCB=3.3V

0 Jack Guan 4 months ago

TI__Mastermind 22231 points

Hello Haiwen,

What is the capacitive load on A side and B side? Is B side driven across longer cables/ PCB traces? Note that the TXB is sensitive to heavy loads due to its weak drive strength and one shot circuitry. Are you able to provide scope-shots of the functioning/ non-functioning waveforms as well?

Do’s and Don’ts for TXB and TXS Voltage Level-Shifters with Edge Rate Accelerators

Regards,

Jack

0 Clemens Ladisch 4 months ago in reply to Haiwen Huang

Guru 267530 points

At the data pins, not the supply pins.

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TXB0106: A to B can work , but B to A can't work