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Voltage Level Translator

Stephen Nortman

Expert 4525 points

Other Parts Discussed in Thread: SN74AUC1G07

Hi,

I have a power management device that outputs a PGOOD signal to 1.8V. I'd like to shift this up to 3.3V. I assume I can use a small/simple/cheap logic device. Could you recommend a part number for this?

Thanks!

over 13 years ago

0 Avi Chami1 over 13 years ago

Mastermind 7395 points

Hi,

Did you check if the PGOOD output of the PM device is open drain? In that case you could pull it to 3.3V. If that is not the case, one possibility is to use the SN74AUC1G07 buffer with OD output, Vcc connected to 1.8V and its OD output pulled to 3.3V.

All the best,

Albert

0 Chris Cockrill over 13 years ago

TI__Mastermind 46480 points

If a buffer is needed

We also have The AUP1T devices that are designed to translate up to Vcc. SN74AUP1T17

Vcc at 3.3V and input can except 1.8V signals. output will be 3.3V.

0 Stephen Nortman over 13 years ago in reply to Chris Cockrill

TI__Expert 4525 points

I need a rise time of <10ns. So open drain won't work. The AUP1T device looks good.

0 Stephen Nortman over 13 years ago in reply to Chris Cockrill

TI__Expert 4525 points

Chris,

could you confirm that this device has <10ns rise time. I assume it does, but the datasheet only specs propagation delay.

only load is a pin.

Thanks much.

0 Chris Cockrill over 13 years ago in reply to Stephen Nortman

TI__Mastermind 46480 points

It would be around 3ns into a 15pf load and 5ns into a 30pf load.