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TXB0101: TXB0101 and TXB0101 in series

Manuel Jansen
Prodigy 30 points
Part Number: TXB0101
Other Parts Discussed in Thread: LSF0101, SN74AXC1T45

Hi,

can two TXB0101 be connected in series or what would be a suitable solution to connect a 1V8 system bidirectionally to the input of a 3V3 TXB0101?

Thanks and regards,

Manuel

  • 0
    Guru 317390 points

    No. TXB inputs require other devices to have a drive strength of at least 2 mA (see section 9.2.1.1 of the datasheet). But TXB outputs provide only 20 µA.

    Furthermore, TXB outputs cannot handle a capacitive load of more than 70 pF. This device might not work when you are using cables/connectors.

    With the TXB at the output of "System 2", no other bidirectional level shifter is possible. Are the signals really bidirectional?

  • 0 in reply to Clemens Ladisch
    Prodigy 30 points

    Thanks for the reply, but I have to ask again, it is also not possible to connect the LSF0101 to the TXB0101? If I see it correctly, the LSF0101 has a low input capacitance and a high output current, right?

    Alternatively, what would be a suitable level translator with directional control (the dir pin should then be controlled by the system controller 1 at 1V8) that could be connected to the TXB0101?

  • 0 in reply to Manuel Jansen
    Guru 317390 points

    The LSF is a passive switch with a drive strength of zero. It outputs open-drain signals; those do not work with the TXB.

    A suitable direction-controlled level shifter would be the SN74AXC1T45.