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TXB0108: Driving current issue

JH Shin
Mastermind 9455 points
Part Number: TXB0108
Other Parts Discussed in Thread: TXU0304, TXU0104, TXU0204, SN74LXC8T245

Hello,

My customer is using the TXB0108 to convert 3.3V input/output signal to 5V input/output signal.

There was no problem with High/Low output level when there was no connection to the 5V terminal.

However, when connecting the 5V terminal, the 5V high output had no problem, but the low output did not go down close to 0V and was output at about 2.5V.

They believe the issue is caused by a lack of TXB0108 output driving current.

1. Is there any way to increase the driving current of the TXB0108?

2. Are there any auto direction products with higher driving current? It's better if it's p2p.

3. If there is no suitable solution for No 1,2, can you please recommend a directional control product with similar function to the TXB0108?

Thank you.

JH

  • 0
    Guru 292420 points

    1. No. The weak outputs are necessary to allow other devices to override the voltage so that bidirectionality is possible.

    2. TXS translators are passive switches that output open-drain signals. Low signals are driven by the originating device. This might or might not work better in this application.

    3. What protocol is this for? For unidirectional signals, use TXU0104/TXU0204/TXU0304. For direction-controlled signals, use something like the SN74LXC8T245.