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TXS0102: Question for TXS0102 VOL issue

Jacky Wang(QD)
Genius 11590 points
Part Number: TXS0102
Other Parts Discussed in Thread: TXB0102, SN74LVC1G17, SN74LVC1T45

Hi Team,

Our customer is using TXS0102 in their system for UART signal translation(5V to 1.8V), due to their TX side circuit limitation, there is 2K resistor in serial on the TXD line as show in below schematic, thus it will cause a very high VOL when TXD output "L". Without changing their solution, they want to add a 20K resistor in serial on VCCB node which will decrease VOL to around 500mV which should meet their specification, so they want to check if we can use TXS0102 like this method - can you help to check it?

Original circuit:

Modified circuit:

Also, it looks like TXB0102 will have no such issue, but we don't find DCT package customer currently used for TXS0102, can you also help to check if we have TXB0102DCTR or TXB0102DCTT samples available now?

Thanks.

  • 0
    Guru 317370 points

    With that added resitors, the translator can no longer output 5 V.

    UART signals are unidirectional. Conversion from 5 V to 1.8 V can be done with any overvoltage-tolerant buffer like the SN74LVC1G17; conversion from 1.8 V to 5 V can be done with the SN74LVC1T45. Such buffered translators have no problems with high-impedance signals.

    The TXB would not work with the 2 kΩ output. There is no solution in the DCT package.