TXS0101: Need more details about OE pin

Ibrahim Kamal

Part Number: TXS0101
Other Parts Discussed in Thread: TLV809E

Hi,

We have used TXS0101 in several circuit before without any issues. Usually, we connect OE to GND via a 100KOhm pull down, and connect it to the host that is powered by VCCA. The host then drives OE some times after booting up.

The problem:

Now, we have a circuit, where we need to do translation between 1.8V and 3.1V, and we don't have enough pins to drive OE. So I'm looking at my options.

What I intend to do is:

connect OE to 100KOhm pull down.
Connect OE to 1KOhm pull up to VCCA
Connect OE to open drains that keep OE low as long as both VCCA and VCCB are not stable

Would that be enough?

If not, what exactly do i need to do with OE if I don't need to use it (and i don't have enough pins in my design to do so) ?

Thanks,

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 318700 points

If you do not care about the state of the I/Os during power up, you can connect OE directly to V_CC.

If you know how much time you need, you could add an R-C circuit to let the OE voltage rise slowly, or use a reset IC like the TLV809E.

0 Ibrahim Kamal over 5 years ago in reply to Clemens Ladisch

Intellectual 390 points

Thanks Clemens Ladisch

So, if I use the power_good output of my voltage regulator to ensure power-up is done + an additional R/C delay, i should be on the safe side.

Thanks,

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TXS0101: Need more details about OE pin