TXS0108E: Can I connect VCCA directly to OE pin with a pull-down ?

Daniel Flor

Part Number: TXS0108E

VCCA is 3.3V and VCCB is 5V. Can I connect VCCA directly to OE pin with a pull-down like is done in the figure attached below?

With my bests regards,

Daniel.

0 Clemens Ladisch over 5 years ago

Guru 283180 points

Yes, you can tie OE directly to VCCA. And because this signal is not controlled externally (e.g., by a microcontroller), you do not need R1.

0 Daniel Flor over 5 years ago in reply to Clemens Ladisch

Ok, but, in the datasheet R1 is recommended. Is there a problem to maintain it?

0 Clemens Ladisch over 5 years ago in reply to Daniel Flor

Guru 283180 points

The datasheet says:

To ensure the Hi-Z state during power-up or power-down periods, tie OE to GND through a pull-down resistor.

If you do not need the Hi-Z state during power-up or power-down periods, you do not need a pull-down resistor.

Leaving R1 in just wastes (a little bit of) power.

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