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TXB0106: datasheet spec. question

CK Ho
Expert 1780 points
Part Number: TXB0106

Dear sir,

Excuse me. I don't know what does the "Io: continuous output current" mean in the datasheet as below.

As I know, CMOS circuit has output current only during transistion.

When static state, CMOS circuit output current is almost zero. Right?

So  I don't know what does the "Io: continuous output current" mean?

And this 50mA means per channel or total current on chip?

Thank you very much.

  • 0
    TI__Guru* 97046 points
    Hello CK,
    First, note that this is the Absolute Maximum Ratings table, which indicates that violating any spec could cause damage to the device.

    The Continuous output current (Io) specification indicates the most current that can be sourced or sunk into any single output on the device without causing damage. In the TXB0106, this is specifically referring to the output current from the one-shot drivers connected to each output. The DC output can only drive about 2mA in the worst case.

    As for the output current of a CMOS output, that will depend on the load. If your CMOS device is outputting 5V, and the load is 50kohm, then the output current will be about 0.1mA. If your output is purely capacitive (ie imaginary), then the output current would be zero after the capacitor is charged.