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TXB0108: TXB0108 leakage path question

Peter Chen(ICP_FAE)
Intellectual 2480 points
Part Number: TXB0108
Other Parts Discussed in Thread: TXB0304

Datasheets shows when VCCA is on and VCCB is off, its IO port disables. Does “disable” mean high-Z? customer concern that is there any leakage when VCCB is off.

 What is the difference in TXB0108 and TXB0304?

  • 0
    TI__Mastermind 24975 points

    Hello Peter,

    Disable means high-Z. You are correct.

    Under partial power down conditions, the outputs are also disabled and put into a high-Impedance state. This feature is referred to as VCC isolation. If VCCB = 0 V, the A-port is disabled. Likewise, if VCCA = 0V, the B-port will be disabled.

    Other than the channel count difference, the major differences include the following:

    Lower voltage range for the TXB030X devices - down to 0.9V

    Higher VCCB voltage range for TXB010X - up to 5.5V

    The VCCA must be less than or equal to VCCB in TXB010X, whereas in the TXB030X devices, either the VCCA or VCCB can be a higher voltage.

    Hope this helps!
    Best,
    Michael

  • 0
    TI__Mastermind 30575 points
    Hello,

    Just a small addition to Michael's post:

    The TXB0304 also differs in that its output is driven by a 1k buffer as opposed to the 4k buffer that drives the TXB0108. This allows the TXB0304 to operate at higher data rates (up to 140 Mbps) when compared to the TXB0108 (up to 100 Mbps).

    Also, because the ouput is driven by a 1k buffer, this requires the host device to have a higher drive strength to overdrive the 1k buffer. The datasheet recommends that the host be able to source/sink at least 3mA of current for proper operation. The TXB0108 only requires the host to source/sink 2mA.