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Original question:

TXS0104 vs TXB0104: Push-Pull versus Open-Drain Support

TXS0104E: TXS0104 vs TXB0104:

WesleyYu Su
Prodigy 20 points
Part Number: TXS0104E
Other Parts Discussed in Thread: TXB0104,

Dear Sir,

I have some question about level shifter of TXS0104 and TXB0104.

1. How about power sequence of these two chip? Ex VCCA -->VCCB -->EN? or EN-->VCCA-->VCCB? or VCCA-->EN-->VCCB?

2. These two chip is bidirectional and we would like to know how this chip change from input to output or output to input when initial?

 

  • 0
    Guru 316440 points

    The TXS and TXB datasheets say:

    The TXS0104E device does not require power sequencing between VCCA and VCCB during power-up so the power-supply rails can be ramped in any order. A VCCA value greater than or equal to VCCB (VCCA ≥ VCCB) does not damage the device, but during operation, VCCA must be less than or equal to VCCB (VCCA ≤ VCCB) at all times.

    During operation, ensure that VCCA ≤ VCCB at all times. During power-up sequencing, VCCA ≥ VCCB does not damage the device, so any power supply can be ramped up first.

    The OE pins are overvoltage tolerant, even without power. The OE pins should not float when VCCA is up.

    Neither the TXS nor the TXB ever change direction. The TXS is a passive switch; when either I/O is pulled low externally, the switch closes. The TXB has weak output drivers that are always active in both directions.

    Also see the voltage translator FAQs, A Guide to Voltage Translation With TXS-Type Translators, and A Guide to Voltage Translation With TXB-Type Translators.