TXB0108: Is there any prohibited condition of input shignal?

Kazuya Nakai59

Part Number: TXB0108

Hello guys,

One of my customers is considering using TXB0108 for their next products.

But the customer worries about IC breaking by input signal condition on A side and B side. Is there any prohibited condition of input shignal for the device?

Even if H or L signal is input to A side and B side at same time, is TXB0108 no damaged?

Could you please tell me whether the following input conditions are no problem or not?

1. A side = H level (DC), B side = L level (DC).

2. A side = L level, B side (DC) = H level (DC).

3. A side = H level (DC), B side = H/L clocking.

4. A side = L level (DC), B side = H/L clocking.

5. A side = H/L clocking, B side = H level (DC).

6. A side = H/L clocking, B side = L level (DC).

7. A side = H/L clocking, B side = H/L clocking.

Your reply would be much appreciated.

Best regards,

Kazuya.

over 6 years ago

0 Karan Kotadia over 6 years ago

TI__Genius 16735 points

Hello Kazuya,

The TXB is a robust device. It shouldn't get damaged from any of these conditions. It has the ability to sink and source up to 50mA of current and so it allows some room for this kind of situation where both lines are being driven at once. The reason there shouldn't be any problems is because of the 4kOhm internal resistors.

You can work out what the behavior would be by looking at the following TXB guide: https://cdn-shop.adafruit.com/datasheets/txb0108appnote.pdf

I cannot say what how the outputs will behave but I am hoping that you won't be trying to read the outputs when both inputs are being driven.

Thanks!

-Karan

0 Kazuya Nakai59 over 6 years ago in reply to Karan Kotadia

Guru 21525 points

Hello Karan,

Thank you for your rely. Your reply is very helpful for the customer and me.

Best regards,

Kazuya.

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TXB0108: Is there any prohibited condition of input shignal?