Part recommendation - Level translator 5V to 1.8V

RajK

Intellectual 740 points

Hello,

I'm looking for level translators with the following requirements -

Voltage - 5V to 1.8V

Data rate - >200Mbps

Thank you

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 316810 points

The fastest 5 V level translators (LXC and TXU) support only 50 Mbps with 1.8 V outputs.

If you need only down translation, you can use buffers with overvoltage-tolerant inputs. AUC devices are fast enough, but do not go above 3.3 V. But you could combine an LVC buffer running at 3.3 V with an AUC buffer running at 1.8 V.

0 RajK over 3 years ago in reply to Clemens Ladisch

Intellectual 740 points

Clemens Ladisch

Thank you for the recommendation. Will these buffers (LVC and AUC) be able to operate at >200Mbps ?

0 Clemens Ladisch over 3 years ago in reply to RajK

Guru 316810 points

Yes; they have a propagation delay of less than 5 ns.

0 RajK over 3 years ago in reply to Clemens Ladisch

Intellectual 740 points

Thank you for confirming. In our application we have to down translate TTL 5V pulses with minimum width of 1ns to 3.3V or 1.8V. What scheme would you recommend for this (5V to 3.3V and 5V to 1.8V)?

0 Clemens Ladisch over 3 years ago in reply to RajK

Guru 316810 points

1 ns corresponds to 1000 Mbps. This is faster than any normal logic gate can support.

What drive strength does this signal have? Is this a 50 Ω or otherwise impedance-controlled line?

0 Yuan Rao over 3 years ago in reply to Clemens Ladisch

TI__Intellectual 1150 points

RajK

Clemens comment is correct. Our portfolio currently doesn't have 1Gbps translators.

Thanks,

Yuan

Interface

Interface forum

Part recommendation - Level translator 5V to 1.8V